NetSafety UNI-TROL Owner's Manual

MODEL: S1G-100-LEL and S2G-100-LEL with PE1100

Single-Channel Field Mount Controller with LEL Sensor

REVISED: MAY, 1998

WARRANTY POLICY

The products of Net Safety Monitoring Inc, are carefully designed and m anufactured from high quality com ponents and can be expected to provide m any years of trouble free service. Each product is thoroughly tested, inspected and burned-in prior to shipm ent. Failures can occur which are beyond the control of the m anufacturer. Failures can be m inim ized by adhering to the operating and m aintenance instructions herein. W here the absolute greatest of reliability is required, redundancy should be designed into the system .

Net Safety Monitoring Inc, warrants its sensors and detectors against defective parts and workm anship for a period of 24 m onths from date of purchase and other electronic assem blies for

36 m onths from date of purchase.

No other warranties or liability, expressed or im plied, will be honoured by Net Safety

Monitoring Inc.

Contact Net Safety Monitoring Inc. or the authorized distributor for details.

Table of Contents

Unit I - GENERAL INFORMATION

DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 1 - Controller Dimensions in Inches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Figure 2 - Controller Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

BASIC OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

FACEPLATE DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

RELAY OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

RECOMMENDATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

CURRENT OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Figure 3 - Jumper Selections For Isolated or Non-Isolated Current Output . . . . . . . . . . . 4

Table 1 - Current Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

PROGRAMMING OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Table 2 - Selectable Output Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

EXTERNAL RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

AUTOMATIC DIAGNOSTICS AND FAULT IDENTIFICATION . . . . . . . . . . . . . . . . . . . . 5

OPERATING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

NORMAL OPERATING MO DE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

RESET MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

FORCED RESET MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

SENSO R REPLACEM ENT MODE(SrP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

SENSOR CALIBRATION MO DE(CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

SET-POINT DISPLAY (Spd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

ADDRESS SET (Adr Set) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

ERROR MESSAGE DISPLAY (ErrChc) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

UNIT II - GENERAL INFORMATION (SENSOR)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 4 - Sensor and Transmitter Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

LOW ER EXPLOSIVE LIMIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Table 3 - Flamm able Gas Volume for 100% LEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

OPERATIONS OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 4 - K Factor for Various Gases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

UNIT III - GENERAL INFORMATION (SENSOR

)

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

SENSOR LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

GENERAL W IRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

CONTROLLER W IRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 5a - W iring for S1G with Non-Isolated Current Output . . . . . . . . . . . . . . . . . . . . 14

Figure 5b - W iring for S1G W ith Isolated Current Output . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 6a - W iring for S2G with Non-Isolated Output . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 6b - W iring for S2G W ith Isolated Current Output . . . . . . . . . . . . . . . . . . . . . . . . 17

DIP SW ITCH SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 7a - Dip Switch Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 7b - Dip Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

ACTIVE CHANNELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

CALIBRATION GAS CONCENTRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

POW ER-UP TIME DELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

ALARM SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

LATCHING/NON-LATCHING SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Table of Contents (Cont)

ENERGIZED/DE-ENERGIZED SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

RELAY SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 9a - Relay Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 9b - Relay Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 5 - Summary of Dip Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

UNIT IV - SYSTEM OPERATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

MENU AND FUNCTION SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 6a - Menu and Function Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 6b - Main Menu Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Table 7 - Special Function Menu Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

START-UP PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

MAIN MENU SELECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

ERROR CHECK MODE(ERR CHC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

SET-PO INT DISPLAY MODE (SPd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Table 8 - System Status Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

SENSOR CALIBRATION (CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

CALIBRATION PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

SENSO R REPLACEM ENT MODE (SrP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

SPECIAL FUNCTION MENU SELECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

FORCED CURRENT OUTPUTS (FoP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

CURRENT CALIBRATION MO DE (CuC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

ADDRESS MODE (Adr Set) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

CHANNEL DISPLAY (Chd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

BYPASS (bPS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

OPERATING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

RESET MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

FORCED RESET MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

NORMAL OPERATING MO DE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

FORCED DISPLAY (FdP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

UNIT V - SYSTEM MAINTENANCE

ROUTINE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

MANUAL CHECK O F OUTPUT DEVICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

SYSTEM CHECK IN NORMAL MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

SENSOR REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

TROUBLESHOO TING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

DEVICE REPAIR AND RETURN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Table 10 - Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Unit I

GENERAL INFORMATION (CONTROLLER)

DESCRIPTION

sensors. The controller is designed to accept the m illivolt signal from the SC1100 LEL sensor without the need for a transm itter to change the signal to a 4-20m A current signal. Controller response includes actuation of relays for direct control of field response devices, 4-20m A DC current output and, a full array of faceplate indicators.

FEATURES

<

<

<

<

<

<

Controller accepts m illivolt inputs (PE1100 LEL sensor).

Two digital displays, one bar graph display, and high intensity LEDs indicate im portant system status inform ation.

AutoCal feature provides easy and accurate calibration.

Microprocessor-based controller is easily field program m able.

4-20m A current output send im portant system inform ation to other devices.

Relay alarm and fault outputs.

SPECIFICATIONS

< Operating Voltage:

24 Volts DC. Device can operate between 18 and 32 Volts DC

< Pow er Consum ption (Controller Only):

3.0 W atts nom inal, 5.2 W atts m axim um (125 m A nom inal, 215 m A m axim um at

24 Volts DC).

Maxim um startup current is 1.0 Am peres for 5 seconds. Power supplies with fold back current lim iting are not recom m ended

< M axim um Ripple:

Ripple should not exceed 5 Volts peak-to-peak. The sum of DC plus ripple m ust be $18 Volts DC and #32 Volts DC.

<

<

<

Temperature Range:

Operating:

Storage:

-40ºC to +85ºC

-55ºC to +150ºC

(-40ºF to +185ºF)

(-65ºF to +302ºF)

Relay Contacts:

Form C norm ally open/norm ally closed contacts rated for 5 Am peres at 30 Volts

DC/ 250 Volts AC

Current Outputs:

One 4-20m A DC current, with a m axim um external loop resistance of 600S at 18-

32 Volts DC.

< Dim ensions:

Refer to Figure 1

-1-

<

<

Shipping W eight (Approxim ate):

6 lbs. (2.7 kilogram s)

Certification:

CSA certified for hazardous locations, Class 1, Division 1, Groups B, C, and D.

Figure 1 - Controller Dimensions in Inches

Figure 2 - Controller Front Panel

BASIC OPERATION

FACEPLATE DESCRIPTION

The controller faceplate provides LEDs for identifying status conditions, two digital displays and a bar graph display for indicating the sensor input, and m agnetically activated MENU/SET and

SELECT/RESET reed switches (see the appendix for activation instructions) for program m ing, calibrating and resetting the system . Refer to Figure 2 for the location of indicators and switches.

< Digital Displays - Two digital displays are used to display the sensor input in both the

Norm al and Calibrate Modes; one display indicates the channel and one display indicates the corresponding sensor input. In the event of a fault, it identifies the nature of the fault using an alphanum eric code. In the Norm al Operating Mode the gas concentration at the sensor is shown. In other operating m odes, the digital displays show the alarm set-points, program m ed calibration gas concentration, output current, or the com m unication addresses for the CAN interface. A negative zero drift condition is indicated by a m inus sign in the left-hand digit. Since at least one display is always lit, they also function as a power indicator.

< Bar Graph Display - The com m on 10-segm ent bar graph display provides readings of the sensor input in 5% LEL increm ents, from 0% to 50% LEL; all 10 segm ents are illum inated when 50% LEL is exceeded.

< High Alarm LED (HI) - Flashes in response to a sensor signal that exceeds the high alarm set-point.

< Low Alarm LED (LOW ) - Flashes in response to a sensor signal that exceeds the low alarm set-point.

< Calibrate LED (CAL) - is illum inated while the controller is in the Calibration Mode.

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< Fault LED (Fault) - is illum inated upon detection of an overall system fault or a channel related fault.

< Channel LEDs - are illum inated when status on the corresponding channel is displayed on the com m on indicators (digital displays and bar graph). During power-up, a channel

LED is on if the channel is selected for operation.

<

<

M ENU/SET Reed Sw itch - is used for changing the m enu display resetting the controller calibration and other system program m ing and calibration functions.

SELECT/RESET Reed Sw itch - is used for m enu selection, and other system program m ing, for resetting the controller.

OUTPUTS

Relay Outputs:

The relay outputs have SPDT contacts rated for 5 Am peres at 30 Volts DC or 250 Volts AC. The four relays include an Area 1 low alarm (channel 1), an Area 2 low alarm (channel 2) one com m on high alarm , and fault alarm .

RECOMMENDATION

The fault relay output should not be used to activate an automatic shutdown procedure.

The fault output indicates a potential problem with the controller, not an alarm condition.

Current Outputs:

Two 4-20m A DC current output for transm itting system inform ation to other devices are also included. The current outputs can be wired for isolated or non-isolated operation by changing the jum pers as shown in Figure 3. Refer to Table 1 for a description of the current output signal levels.

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Figure 3 - Jumper Selections For Isolated or

Non-isolated Current Output

Current Output

0m A

1m A

2m A

3m A

4m A to 20m A

Table 1 - Current Outputs

Situation

Open or shorted signal output, or loss of power

Fault or Power-Up

Power Fault

Calibration

0 to 100% LEL gas concentration

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PROG RAM M ING OPTIONS

A set of dip-switches, located on the circuit board, can be used to “program ” various options and

<

<

<

< set-points, including:

< channels selected for operation,

< low and high alarm settings, calibration gas concentration, power-up delay tim e (either 45 or 90 seconds), latching / non-latching relay action energized / de-energized relay action

The alarm relays are program m able for either norm ally energized or norm ally de-energized operation (program m able as a group only, not individually). The fault relay is norm ally energized.

The low alarm relays are program m able for either latching or non-latching operation. The high alarm relay is always latching and the fault relay is non-latching. Refer to Table 2.

Jum per selections are provided for norm ally open or norm ally closed relay outputs and for isolated or non-isolated current outputs.

OUTPUT

LOW

1

Selectable Norm ally

Open/Closed

Y

HIGH Y

FAULT Y

Table 2 - Selectable Output Options

1

2

Selectable Norm ally

Energized/De-Energized

Y

Y

N

2

2

4

Low alarms are programed together, not individually

3

Programmable together, not individually

High alarm relay is always latching

4

Fault relay is normally energized

5

Fault relay is non-latching

Selectable

Latching/Non-latching

Y

N

3

N

5

EXTERNAL RESET

A norm ally open, m om entary closure switch can be connected between the external reset term inal and the negative power term inal to provide rem ote reset capabilities.

AUTOM ATIC DIAGNOSTICS AND FAULT IDENTIFICATION

The m icroprocessor-based controller features self-testing circuitry that continuously checks for problem s that could prevent proper system response. W hen power is applied, the m icroprocessor autom atically tests m em ory. In the Norm al Operating Mode, it continuously m onitors the input signals from the sensor to ensure proper functioning. In addition, a "watchdog" tim er is m aintained to ensure that the program is running correctly. The tim er resets the m icro-controller if it enters erroneous processor states within a reasonable period of tim e.

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If a fault is detected, the Fault LED illum inates, the digital display identifies that a fault has occurred, the fault relay output becom es de-energized, and the current output drops to less than 1 m A.

The nature of the fault can be identified by a num eric code, which can be viewed in the Fault

Message Display m ode.

OPERATING M ODES

The controller can operate in any of the m odes discussed in this section. Operating m odes other than Norm al are selected by activating the appropriate MENU/SET and SELECT/RESET switches located on the controller front panel. Refer to Figure 2 for a diagram of the controller front panel.

NOTE

This section is intended to acquaint the user with the basic operation of the controller.

Refer to “Unit III” for detailed instructions and description.

Norm al Operating M ode:

If no alarm s or faults are present, the Module will be in a Level 1 Display Mode; the bar graph and digital display indicate the sensor inputs. Relay outputs are in their norm al state, and the current output corresponds to the sensor input.

If a low alarm condition occurs, the controller will be in a Level 2 Display Mode; the bar graph and digital display will display the gas concentration at the sensor. The low alarm LED will flash, the low alarm relay changes state, and the current output changes to indicate the alarm . If the signal decreases below the low set-point again, the low alarm relay returns to its norm al state if program m ed for non-latching operation and rem ains unchanged if program m ed for latching operation. The current output returns to norm al. The low alarm LED will rem ain illum inated, but will no longer flash.

If a high alarm condition occurs, the m odule will be in a Level 3 Display Mode; the bar graph and digital display will display the gas concentration at the sensor and the high alarm LED will flash.

Reset M ode:

The system is reset by activating the SELECT/RESET switch located on the front panel of the controller. (Refer to Figure 2) W hen the SELECT/RESET switch is activated m om entarily, all outputs return to their norm al condition if no alarm s or faults are present. (basic reset).

Forced Reset M ode:

If the controller receives a signal beyond 100% LEL from the sensor, a reset will not clear the alarm s, even if the channel has returned to levels below the low alarm set point. The error resulting from this occurrence m ust be cleared and a forced reset applied. To apply a forced reset, activate the SELECT/RESET switch for 1 second, the LEDs turn off and the outputs return to their norm al condition. The rem ote reset perform s a forced reset.

NOTE

The remote reset performs a reset function only. It cannot be used for other controller functions.

Sensor Replacem ent M ode (SrP):

This m ode inhibits all controller outputs to allow replacem ent of the sensor without rem oving power from the controller. Alarm set-points and calibration gas concentration are not affected.

The left display will show ‘SrP’ while in the sensor replace m ode. The right display will show the status of the sensor being replaced (‘NoS’ m eans no sensor is connected). The fault LED is on and the fault relay is de-energized. The channel LED will be on for the sensor being replaced.

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All other display features will be inhibited. In order to exit this m ode the SELECT/RESET switch m ust be activated.

Sensor Calibration M ode (CAL): by the operator. The controller displays ‘Air’ on the left display and channel status on the right display while autom atically perform ing the zero adjustm ents. Next the controller will signal the user to apply calibration gas by alternating ‘gAS’ and ‘in’ on the left display. W hen the controller detects that the gas has been applied to the sensor, the left display will read ‘gAS’. Once the controller has finished the gain adjustm ents it will alternate ‘Cut’ and ‘gAS’ on the left display, telling the user that it is tim e to rem ove the calibration gas. Upon com pletion of calibration the controller will autom atically return to norm al operating m ode, after the gas level has dropped below 50% of the low alarm setting.

If the operator fails to com plete the calibration procedure, if an error in the calibration procedure occurs, or if a successful calibration cannot be com pleted, the m icroprocessor will autom atically return to the Norm al Operating Mode and continue to use the previous calibration data. A fault indication will be displayed until a reset occurs. If the m icroprocessor determ ines that the sensor is approaching the end of its useful life, a fault code will indicate this.

W hile in the calibration m ode, all controller outputs are inhibited and the ‘Cal’ LED is illum inated.

Set-Point Display (Spd):

In this m ode, the digital display sequentially shows the program m ed low and high alarm set-points, calibration gas concentration, and com m unication addresses. Each value is displayed for approxim ately 2 seconds.

Address Set (Adr Set): DO NOT USE THIS FUNCTION

The com m unication addresses for the CAN bus are set in this m ode, which is found in the special function m enu. The MENU/SET and SELECT/RESET switches are used to raise and lower the address. This m ode can only be exited by allowing ten seconds to go by without activating either switch.

Error M essage Display (ErrChc):

The m icroprocessor-based controller features self-testing circuitry that continuously checks for problem s that could prevent proper system response. As a diagnostic and troubleshooting tool, identifiable faults are displayed on the digital display, using error codes, during the Error Message

Display Mode. The controller will also display an error m essage after the last channel in the cycling routine.

NOTE

If no errors exist, this function is hidden and can not be accessed.

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Unit II

GENERAL INFORMATION (SENSOR)

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DESCRIPTION

The Net Safety Monitoring Inc. SC1100 com bustible gas sensor head consists of an explosionproof enclosure, which contains sensor electronic circuitry. The sensors used are catalytic oxidation sensors, or pellistors, designed to provide continuous m onitoring of com bustible gasses such as m ethane and butane, etc. in the percent lower explosive lim its (LEL). Each sensor is a m atched pair of detector and reference elem ents which are operated in a W heatstone Bridge circuit.

FEATURES

High degree of poison resistance m eans sensors will m aintain their sensitivity over extended periods of operation.

< Designed and m anufactured for low drift over tem perature extrem es.

SPECIFICATIONS

Range:

0 to 100% LEL

Operating Hum idity Range:

0 to 100% relative hum idity

Response Tim e:

Less than 30 seconds to reach 90% of full scale reading with m ethane (in still air).

Zero Drift:

Typically less than 2% LEL per m onth

Sensor Life:

Operation:

Storage:

2 to 5 years expected.

Indefinite

Calibration Cycle:

60 to 90 Days Groups

Certification:

CSA certified for hazardous locations,

Class 1, Division 1, Groups B, C, and D.

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Figure 4 - Sensor and Transmitter Dimensions

LOWER EXPLOSIVE LIMIT

A com bustible gas is one that will burn when m ixed with air (or oxygen) and ignited. The lower explosive lim it (LEL), or lower flam m able lim it (LFL), of a com bustible gas is defined as the sm allest am ount of the gas that will support a self-propagating flam e when m ixed with air and ignited. In gas detection system s, the am ount of gas present is specified in term s of % LEL; 0%

LEL being a com bustible gas-free atm osphere and 100% LEL being an atm osphere in which the gas m ix is at its lower explosive lim it. The relationship between % LEL and % by volum e differs from gas to gas. Refer to Table 3.

GAS, 100% LEL CONCENTRATION

4.0%

5.0%

3.0%

2.7%

1.5%

2.2%

Table 3 -Flamm able Gas Volume for 100% LEL

For data on other gases, refer to NFPA 5th Edition 325M.

-9-

The LEL of gas is affected by tem perature and pressure. As the tem perature increases, the LEL decreases and hence the explosion hazard increases.

The relationship between LEL and pressure is fairly com plex, but at approxim ately one atm osphere, a pressure increase usually lowers the LEL. The LEL of a gas is not significantly affected by the hum idity fluctuations norm ally encountered in the operation of a gas detection system .

OPERATION OVERVIEW

The sensors used are catalytic oxidation sensors, or pellistors, designed to m easure concentrations of com bustible gases in air up to their lower explosive lim it. Each sensor is a m atched pair of detector and reference elem ents which are operated in a W heatstone Bridge circuit. The active elem ent, which com prises a coil of platinum wire em bedded within a catalytic bead is capable of oxidizing com bustible gases while the inert reference elem ent com pensates for changes in am bient tem perature and hum idity. The heat generated during oxidation increases the tem perature and resistance of the detector elem ent, producing an out-of-balance signal in the

W heatstone Bridge circuit proportional to the concentration of com bustible gas.

Table 4 lists the theoretical factors by which the signal with a calibration gas should be m ultiplied to give the signal for other gases. The following form ula m ay be used:

NOTE

These figures are theoretical, and may differ from sensor to sensor. For best results, the sensors should be calibrated with the gas they are intended to detect.

Exam ple: For an instrum ent calibrated with Methane and used to detect Propane.

K

M E T H A N E

= 112.0

K

P R O P A N E

= 61.8

Signal shown for 50%LEL Propane is calculated as follows:

Signal = 50% x 61.8 / 112 = 27.6%

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GAS

Acetaldehyde

Acetic Acid

Acetic Anhydride

Acetone

Acetylene

Alkyl Alcohol

Am m onia n-Am yl Alcohol

Aniline

Benzene

Biphenyl

1,3-Butadiene n-Butane iso-Butane

Butene-1 cis-Butene-2 trans-Butene-2

K

67.3

n-Decane

60.8

Diethylam ine

51.5

Dim ethylam ine

57.8

2,3-Dim ethylpentane

63.6

2,2-Dim ethylpropane

57.1

Dim ethylsulphide

142

28

GAS

1,4-Dioxane

36.6

Ethane

44.1

Ethyl Acetate

45.6

Ethyl Alcohol

Ethylam ine

62.5

Ethyl Benzene

65.5

Ethylcyclopentane

57.8

Ethylene

50.8

Ethyleneoxide

54.2

Diethyl Ether

56.7

Ethyl Form ate n-Butyl Alcohol iso-Butyl Alcohol tert-Butyl Alcohol n-Butyl Benzene

38.4

Ethylm ercaptan

59.2

n-Heptane

83.1

n-Hexane

35.2

Hydrazine iso-Butyl Benzene n-Butyric Acid

Carbon Disulphide

35.8

42.5

19.8

Hydrogencyanide

Hydrogen

Hydrogen Sulphide

Carbon Monoxide 84.4

Methane

Carbon Oxysulphide 105 Methyl Acetate

Cyanogen

Cyclohexane

99.9

46

Methyl Alcohol

Methylam ine

Cyclopropane 69.7

Methylcyclohexane

Table 4 - K Factor for Various Gases

K GAS

36.7

Dim ethyl Ether

54.6

Methylethylether

64.7

Methylethylketone

44.6

Methyl Form ate

44.4

Methylm ercaptan

48.6

Methylpropionate

50 Methyl n-propylketone 45.4

70

K

49.3

46.2

75

67.9

57.2

75.8

Naphthalene

57.4

Nitrom ethane

81.5

n-Nonane

38.1

64.8

35.2

58.9

n-O ctane

39.9

n-Pentane

44.4

iso-Pentane

79.1

Propane

57.9

n-Propyl Alcohol

51.8

n-Propylam ine

49.5

Propylene

41.9

51.3

51.9

61.8

52.7

54.1

57.7

62.8

Propyleneoxide

43.2

iso-Propylether

41.2

Propyne

50.4

Toluene

53.4

Triethylam ine

85.8

Trim ethylam ine

45.6

Vinylethylether

112 o-Xylene

55.6

m -Xylene

96.2

p-Xylene

86.5

49.4

51.2

48.8

46.5

45.2

44.6

54.3

46.9

40.1

43.8

43.8

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Unit III

SYSTEM INSTALLATION

INSTALLATION

SENSOR LOCATIONS

Proper location of the sensors is essential for providing m axim um protection. The m ethod for deciding the m ost effective num ber and placem ent of sensors varies depending on the conditions at the job site. The individual perform ing the installation m ust rely on experience, com m on sense, and knowledge of plant operations to determ ine the num ber of sensors needed and the best controller locations to protect the area adequately.

The following factors are im portant and should be considered for every installation:

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Sensors should be located where they are safe from potential sources of contam ination.

Refer to sensor application m anuals and follow guidelines for sensor installation.

Sensors m ust be accessible for testing and calibration.

Exposure to excessive heat or vibration can cause prem ature failure of electronic devices, and should be avoided if possible.

GENERAL W IRING REQUIREM ENTS

NOTE

The wiring procedures in this manual are intended to ensure proper functioning of the device under normal conditions. However, because of the many variations in wiring codes and regulations, total compliance to these ordinances cannot be guaranteed. Be certain that all wiring complies with applicable regulations that relate to the installation of electrical equipm ent in a hazardous area. If in doubt, consult a qualified official before wiring the system.

The use of shielded cable is highly recom m ended for any signal wires to protect against interference caused by extraneous electrical 'noise'. This includes power and current outputs; relay outputs do not require shielded cable. In applications where the wiring cable is installed in conduit, the conduit m ust not be used for wiring to other electrical equipm ent.

NOTE

The S1G and S2G controllers have been certified, as ‘No Seal Required’ since it will not ignite an explosive atmosphere, under norm al operating conditions. Net Safety

Monitoring Inc. does, however, recommend conduit seals to prevent moisture damage.

Since m oisture can be detrim ental to electronic devices, it is im portant that m oisture not be allowed to contact the electrical connections of the system . Moisture in the air can becom e trapped within sections of conduit. Therefore, the use of conduit seals is recom m ended to prevent dam age to electrical connections caused by condensation within the conduit.

These seals m ust be watertight and explosion-proof and should be installed even if they are not required by local wiring codes. A seal should be located as close to the device as possible. Never should this seal be located m ore than 18 inches (46 cm ) from the device. W hen an explosionproof installation is required, an additional seal m ay be needed at any point where the conduit enters a non-hazardous area. Always observe the requirem ents of local codes.

-12-

W hen pouring a seal, the use of a fibre dam is required to assure proper form ation of the seal.

The seals should never be poured in tem peratures that are below freezing, since the water in the sealing com pound will freeze and the com pound will not dry properly. Contam ination problem s can then result when tem peratures rise above the freezing point and the com pound thaws.

The shielding of the cable should be stripped back to perm it the seal to form around the individual leads, rather than around the outside of the shield. This will prevent any siphoning action that can occur through the inside of the shield.

It is recom m ended that conduit breathers also be used. In som e applications, alternate changes in tem perature and barom etric pressure can cause 'breathing', which allows the entry and circulation of m oist air throughout the conduit. Joints in the conduit system and its com ponents are seldom tight enough to prevent this 'breathing'. Moisture in the air can condense at the base of vertical conduit runs and equipm ent enclosures, and can build up over a tim e. This can be detrim ental to electronic devices. To elim inate this condition, explosion-proof drains and breathers should be installed to bleed off accum ulated water autom atically.

The m axim um distance between the sensor and controller is lim ited by the resistance of the connecting wiring, which is a function of the gauge of the wire being used. Three wire, 18 AW G, shielded cable is recom m ended. If the recom m ended wire is used, the sensors m ay be located up to 500 feet from the controller.

CAUTION

All terminations between the controller and sensors must be good tight electrical connections. If proper connections are not made, the voltage monitoring circuit in the controller will not function properly and the sensors may be damaged or operate incorrectly.

CONTROLLER W IRING

NOTE

The controller contains semiconductor devices that are susceptible to damage by electrostatic discharge. An electrostatic charge can build up on the skin and discharge when an object is touched. Therefore, use caution when handling, taking care not to touch the terminals or electronic components. For more information on proper handling, refer to the Appendix.

The sensor direct, Unitrol controllers (S1G and S2G) can be configured for an isolated or nonisolated current output by changing a jum per on one of the controllers circuit boards (see 6a

Figure 3). Figure 5 and 6 show the term inal configuration for the controllers. Figures 5a and 6a show the proper wiring of the controller for a non-isolated current output. Figure 5b and 6b show the proper wiring of the controller for an isolated current output.

NOTE

If local wiring codes permit, and if a ground fault monitoring system is not being used, the minus side of the DC power source can be connected to chassis (earth) ground.

Alternatively, a 0.47 microfarad, 100 Volt capacitor can be installed between the minus side of the DC power supply and chassis ground for best immunity against electromagnetic interference.

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DIP SWITCH SETTINGS

It is essential that the controller be properly program m ed before applying power to the system .

There are three banks of dip switches located on the controller. Each switch bank has eight individual switches that can be set to an ‘ON’ or ‘OFF’ position.

NOTE

The dip switches are located on the bottom side of the display circuit board. The switch banks are numbered from right to left as numbers SW 3, SW 4, and SW 5. Refer to

Figure 8a. Individual switches are referenced as “X.Y”, where “X” refers to the bank number and “Y” refers to the switch number on “X” bank. For example, switch 3.4 (SW 3.4) is switch number four on bank number three. ‘Switches are set as either “O N” or “O FF”.

Refer to Figure 8b.

NOTE

IT IS VERY IMPO RTANT THAT POW ER TO THE CONTROLLER IS RECYCLED

AFTER ANY DIP SW ITCH CHANG ES, TO MAKE THE CHANG ES TAKE EFFECT!

Figure 7a - Dip Switch Position

Figure 7b - Dip Switch

ACTIVE CHANNELS

Switches for setting the active channels (the channels that are to have sensors/transm itters attached) can be found on Switch Bank 3, switch 1 (SW 3.1). Set the designated switch to “OFF” if the channel is to be connected (sensor attached), and “ON” if the channel is not to be used.

SW 3.1 will be set to the ‘OFF’ position for you.

SW 3.1: OFF:

ON: channel 1 connected channel 1 not connected

NOTE

SW 3.2 to SW 3.4 are not used and should be turned ‘ON’.

CALIBRATION GAS CONCENTRATION:

Calibration gas concentration is set using the dip switches on the circuit board. To select the calibration gas concentration of 50% LEL, set SW 3.5 to ‘OFF.’ If a selectable value (from 20% to

99%) is required, set SW 3.5 to ‘ON’; SW 4.1 through SW 4.7 m ust then be used to select the calibration gas concentration. SW 3.5 is factory set to the ‘OFF’ position.

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SW 3.5: OFF: calibration gas set to 50%

(ignore SW 4.1 - SW 4.7)

ON: calibration gas selectable

(set SW 4.1 - SW 4.7)

NOTE

If SW 3.5 is set to ‘ON’, it is very important to accurately set SW 4.1 to SW 4.7. If SW 3.5 is set to ‘OFF’ position, the settings of SW 4.1 to SW 4.7 are inconsequential.

If the selectable option is chosen (above), the calibration gas concentration m ust be set. This is done on Switch Bank 4, switches 1 through 7 (SW 4.1 to SW 4.7). The required calibration gas concentration m ust be set with these switches using the binary counting system . “ON” selects the value listed below; “OFF” selects a zero.

SW 4.1: ON:

SW 4.2: ON:

SW 4.3: ON:

SW 4.4: ON:

SW 4.5: ON:

SW 4.6: ON:

SW 4.7: ON:

1%

2%

4%

8%

16%

32%

64% calibration gas concentration

The switches can be used in com bination to select concentrations from 20% to 99% LEL.

Exam ple:

SW 4.1 OFF

SW 4.2 OFF

SW 4.3 ON

SW 4.4 ON

SW 4.5 ON

SW 4.6 ON

SW 4.7 OFF calibration gas concentration

= 60% LEL

NOTE

If a calibration gas concentration greater than 99% or less than 20% is programmed, the controller will give a configuration error (E90) when power is applied.

POW ER-UP TIM E DELAY

SW 3.6 is used to select the power-up tim e delay:

SW 3.6: OFF:

ON:

45 seconds

90 seconds

NOTE

SW 3.7 and SW 3.8 are not used.

ALARM SETTINGS

Switch bank 4, switch 8 (SW 4.8) is used to set the Low and High alarm to a default or selectable value. If SW 4.8 is ‘OFF’ the Low Alarm will be set to 20% LEL and the High Alarm to 40% LEL.

If SW 4.8 is ‘ON’, the low and high alarm are selectable, using SW 5.3 to SW 5.8. Switch 4.8 is set to the ‘OFF’ position at the factory.

SW 4.8: OFF: low alarm @ 20% high alarm @ 40%

(ignore SW 5.3 - SW 5.8)

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ON: selectable alarm

(set SW 5.3 - SW 5.8)

NOTE

If SW 4.8 is set to ON, it is very important to accurately set SW 5.3 to SW 5.8. If SW 4.8 is set to the ‘OFF’ position, the settings of SW 5.3 to SW 5.8 are inconsequential.

If the selectable option is chosen (SW 4.8 is ‘ON’), the alarm s m ust be set with SW 5.3 to SW 5.8.

The low alarm can be set from 5% to 40% LEL and the high alarm is autom atically set at twice the low alarm value. The low alarm value is set using the binary counting system . ‘ON’ selects the value listed below; ‘OFF’ selects a zero.

SW 5.3: ON:

SW 5.4: ON:

SW 5.5: ON:

SW 5.6: ON:

SW 5.7: ON:

SW 5.8: ON:

1%

2%

4%

8%

16%

32%

The switches can be used in com bination to select low alarm settings from 5% to 40% LEL. If a low alarm level less than 5% or greater than 40% is program m ed, the controller will give a configuration error(E90) upon power up.

Exam ple:

SW 5.3 OFF

SW 5.4 OFF

SW 5.5 ON

SW 5.6 ON

SW 5.7 OFF

SW 5.8 OFF low alarm 12% LEL high alarm 24% LEL

NOTE

IT IS VERY IMPO RTANT THAT POW ER TO THE CONTROLLER IS RECYCLED

AFTER ANY DIP SW ITCH CHANG ES, TO MAKE THE CHANG ES TAKE EFFECT!

LATCHING/NON-LATCHING SELECTION

Switch Bank 5, switch 1 is used to set the low alarm relays for latching or non-latching operation; the high alarm is always latching and the fault is always non-latching.

SW 5.1: OFF:

ON: low alarm relay low alarm relay latching operation non-latching operation

NOTE

IT IS VERY IMPO RTANT THAT POW ER TO THE CONTROLLER IS RECYCLED

AFTER ANY DIP SW ITCH CHANG ES, TO MAKE THE CHANG ES TAKE EFFECT!

Refer to Table 3, at the end of this unit, for a sum m ary of the dip switch settings.

ENERGIZED/DE-ENERGIZED SELECTION

Switch Bank 5, switch 2 (SW 5.2) is used to set the high and low alarm relays for norm ally energized or norm ally de-energized operation; the fault relay is always norm ally energized. SW 5.2

is factory set to the ‘ON’ position.

SW 5.2: OFF: alarm relays norm ally energized

ON: alarm relays norm ally de-energized

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RELAY SETTINGS

There are three relays on the controller circuit board that can be set up for norm ally open or norm ally closed operation by m oving the jum pers which are located below the relays. See Figure

9a for the location of the relays on the circuit board and Figure 9b for the correct settings.

Figure 9a - Relay Positions

Figure 9b - Relay Settings

INSTALLATION CHECKLIST

The following checklist is provided as a m eans of double checking the system to be sure that all phases of system installation are com plete and have been perform ed correct.

T Controller is securely m ounted and sensor is oriented correctly

T

T

All cable shields are properly grounded at one end only

Explosion-proof conduit seals have been installed at all conduit entries (if conduit is being used)

T

T

T

T

Sensor to controller wiring is correct

Power wiring to the controller is installed and power source is operational

External loads are properly connected to the controller

Controller is program m ed as needed. Record this inform ation for future reference. A table is provided in the appendix for this purpose

T Controller is properly installed in the housing

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T Proper ventilation is provided to prevent overheating of the controller

SW ITCH

SW 3.7 & SW 3.8

SW 3.1

SW 3.2

SW 3.3

SW 3.4

SW 3.5

SW 3.6

SW 4.1 - SW 4.7

SW 4.8

SW 5.1

SW 5.2

SW 5.3 - SW 5.8

OPEN (OFF)

Channel 1 connected

Channel 2 connected

CLOSED (ON)

NOT USED

Channel 1 not connected

Channel 2 not connected

Channel 3 connected

Channel 4 connected

Channel 3 not connected

Channel 4 not connected

Calibration gas concentration is set to 50% of full scale (ignore

SW 4.1 to SW 4.7)

Calibration gas concentration is selectable using SW 4.1 to SW 4.7

Power-up tim e delay is 45 seconds Power-up tim e delay is 90 seconds

Set calibration gas concentration from 20% to

99% of full scale

LOW alarm @ 20% of full scale/HIG H alarm @ 40% of full scale (ignore SW 5.3 to SW 5.8)

LOW alarm relay is latching

LOW and HIG H alarm relays norm ally energized

Selectable alarm settings using SW 5.3 to

SW 5.8 (LOW = 5% to 40% of full scale; HIGH

= 2 x LOW )

LOW alarm relay is non-latching

LOW and HIGH alarm relays norm ally deenergized

Set LOW alarm settings from 5% to 40% of full scale (HIGH alarm is twice the LO W alarm setting)

Table 5 - Summary of Dip Switch Settings

Unit IV

SYSTEM OPERATION

MENU AND FUNCTION SELECTION

The controller has various functions and m enus that can be entered by activating the MENU/SET

(and SELECT/RESET) switches for a specified am ount of tim e. Table 6, below, indicates how to enter the various m enus and functions.

SW ITCH

SELECT/RESET

SELECT/RESET

M ENU/SET

M ENU/SET

M ENU/SET & SELECT/RESET

Sim ultaneously

Table 6a - Menu and Function Selection

TIM E

< 0.5 sec

1 sec

2 sec

5 sec

20 sec

FUNCTION OR M ENU

Basic Reset

Forced Reset

Forced Display [FdP]

Main Menu

Special Function Menu

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Further explanation on how to enter the functions will be given in the following discussion. The

Main Menu has five functions within it (See Table 7) and the Special Function Menu has five functions (See Table 8).

To enter the Main Menu, activate the MENU/SET switch for approxim ately 5 seconds, until ‘Err

Chc’ or ‘Spd’ is displayed, then release it. Once in the Main Menu, the next selection can be brought up by activating the MENU/SET switch. The SELECT/RESET switch is used to accept a currently displayed selection.

Failure to activate any switches for a period of 10 seconds will result in the controller returning to the Norm al Operating Mode. Selecting the Return function will also return the controller to the

Norm al Operating Mode. W hen “rtn” is on the lower digital display, m om entarily activate the

SELECT/RESET switch.

Sum m ary of M ain M enu:

Enter Main Menu:

Find Desired Function:

Select Function:

Next Function:

Exit Main Menu:

M ENU/SET for 5 sec.

M ENU/SET

SELECT/RESET

M ENU/SET no buttons for 10 sec. or Select RETURN function

LEFT DIGITAL

DISPLAY

Err blank blank blank blank

Table 6b - Main Menu Selection

RIGHT DIGITAL

DISPLAY

Chc

SPd

CAL

SrP rtn

LEFT DIGITAL

DISPLAY blank

RIGHT DIGITAL

DISPLAY

FO P blank

Adr blank blank

CUC

SEt

Chd bPS blank rtn

Table 7 - Special Function Menu Selection

FUNCTION

Error Check (hidden if no errors)

Set Point Display

Calibration

Sensor Replacem ent

Return

Forced current output

Current output calibration

Set network address

Channel display

Bypass

Return

FUNCTION

START-UP PROCEDURE

2

3

Output loads that are norm ally actuated by the system should be secured.

Rem ove power from all of the output devices to prevent undesired activation

Check all external wiring for proper connections. Be sure that the sensor has been wired properly

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4

5

Before installing the controller, inspect it to verify that it has not been physically dam aged in shipm ent. Check the dip switches on the controller for proper program m ing

Apply power to the system .

NOTE

The controller has a 45 or 90 second delay (as programmed), before beginning normal operation, after power is applied to the system. During this time the outputs are inhibited, the Fault LED is illuminated, the left digital display cycles through the active channels, and the right digital display counts down from 45 or 90. This delay allows time for the sensors to stabilize before beginning normal operation.

6

7

Put the controller in the Set-point Display Mode to check the present alarm setpoints and calibration gas concentration. If changes are required, refer to the ‘Dip

Switch Setting’ section of the m anual

Calibrate the sensor(s); refer to the Sensor Calibration Procedure

8 Rem ove m echanical blocking devices (if used) and restore power to the output loads

MAIN MENU SELECTIONS

ERROR CHECK M ODE (Err Chc)

The m icroprocessor-based controller features self-testing circuitry that continuously checks for problem s that could prevent proper system response. As a diagnostic and troubleshooting tool, identifiable faults are displayed on the digital display during the Error Message Display Mode.

Two types of faults are identified: system faults and channel faults. Table 7 lists the codes and the corresponding conditions.

<

<

If a fault should occur:

< the norm ally energized fault output is de-energized, the Fault LED is illum inated, and if no alarm is occurring and the controller is sequentially displaying each sensor input, the m essage ‘Err’ ‘Fnd’ (left and right displays) will be displayed after each sequence.

To view the fault code, enter the Main Menu, then m om entarily activate the SELECT/RESET reed switch when ‘Err’ is displayed on The right digital display. Next, activate the MENU/SET reed switch repeatedly; the left digital display will sequentially show:

‘SYS’ - system faults

‘CH1' - channel 1 faults

‘CH2' - channel 2 faults

‘CH3' - channel 3 faults

‘CH4' - channel 4 faults

‘Clr’ clear faults

NOTE

If no errors exist, this function is hidden and can not be accessed.

To select the fault to be displayed, m om entarily activate the SELECT/RESET reed switch when the required fault is being displayed on the left digital display. The left digital display will show the channel (or system ) and the right digital display will show the fault code, for 5 seconds then m ove to the next channel.

-24-

NOTE

Faults that affect the actual function of the controller (50, 60, 70, 9X) can impair the ability of the controller to maintain an alarm output.

All faults autom atically reset except the 9X, 20, and 10 faults. After the fault condition has been corrected, the fault output autom atically switches to the norm al (energized) state, the DC current output returns to norm al, and the Fault LED turns off. Clearing 9X faults requires rem oving operating power from the controller for approxim ately one second. Clearing 20 and 10 requires a reset.

CAUTION

The fault detection circuitry does not monitor the operation of external response equipment or the external wiring to these devices. It is important that these devices be checked periodically to ensure that they are operational.

SET-POINT DISPLAY M ODE (SPd)

1 In this m ode, the digital displays sequentially display the low and high alarm and calibration gas concentration autom atically. This function is used to check the present alarm and calibration gas set-point values.

2

3

4

To enter the Set-point Display Mode, enter the Main Menu, activate the

MENU/SET reed switch repeatedly until ‘Spd’ is displayed on the right digital display, then m om entarily activate the SELECT/RESET reed switch

The Low LED goes on, ‘LoA’ is shown on the left digital display, and the low alarm set-point is shown on the right digital display for 2 seconds

The Low LED goes out, the High LED goes on, ‘HiA’ is shown on the left digital display, and the high alarm set-point is shown on the right display for 2 seconds

5

6

The High LED goes out, the Cal LED goes on, ‘CAL’ is shown on the left display, and the calibration gas concentration (in percent LEL) is shown on the right display for 2 seconds

The Cal LED goes out, ‘Adr’ is shown on the left display and the right digital display shows the com m unication address for the CAN interface for 2 seconds.

Address setting is not used

7

8

Finally, the controller returns to the norm al operating m ode (it is no longer in the m ain m enu)

If adjustm ents to the set-points are required, the settings on the program m ing dip switches m ust be changed; Refer to ‘DIP SW ITCH SETTINGS’ in the ‘SYSTEM

INSTALLATIONS’ section of this m anual for instructions. W hen the set-point levels are acceptable, record this inform ation for future reference and proceed to

‘CALIBRATION.’

NOTE

IT IS VERY IMPORTANT THAT POW ER TO THE CONTROLLER IS RECYCLED

AFTER ANY DIP SWITCH CHANGES, TO MAKE THE CHANGES TAKE EFFECT!

STATUS

E90

CONDITION

Dip Switch Configuration error

W HAT TO DO

Check dip switch settings and recycle power

-25-

E91

E94

E95

E96

RAM or processor failure

Set-point and calibration data lost

Internal 5 volt supply failure during start-up

External 24 volt supply failure during start-up

EEPROM failure

Duplicate CAN address.

Consult the Factory

Consult the Factory

Consult the Factory

Consult the Factory

E97

E98

E99

CHx E80

Lost com m unication.

Sensor output is m ore than 26 m A

CHx E70 External reset switch has been activated for 15 seconds or longer.

Self clearing when switch is released.

CHx E40 Sensor (or transm itter) input failure; input is below 1 m A.

CHx E30 Negative zero drift; sensor (or transm itter) is -9% full scale or lower.

CHx E20 Tim e ran out while waiting for the user to apply gas to the sensor.

CHx E21 Sensor (or transm itter) output is too low; enough offset to get an accurate calibration is not being generated.

CHx E22 Sensor can not be calibrated.

CHx E23 Sensor is too sensitive for the detector to read 100% full scale.

CHx E24 Zero point is m ore than 6% below standard value

CHx E25 Zero point is m ore than 6% above standard value

CHx E10 Calibration was successful, but sensor reaching end of life or tim e to change jum per position on transm itter

CHx goP Over-range error (reading greater than

100% of full range)

Table 8 - System Status Codes

(Chx = Channel number)

Consult the Factory

Check CAN address and change to a vacant address

Check com m unication wiring, disconnect controller, and re-connect it. If this does not help, contact the factory

Check wiring and signal output from sensor

Check external reset switch for a short, or faulty operation

Check wiring and signal output from sensor.

Calibrate transm itter.

Restart calibration procedure.

Calibrate transm itter or replace sensor.

Calibrate transm itter or replace sensor.

Calibrate transm itter or replace sensor.

Calibrate transm itter

Calibrate transm itter

Be prepared to calibrate transm itter or replace sensor at next calibration tim e

Insure area has been de-contam inated then perform a forced reset

SENSOR CALIBRATION (CAL)

General Inform ation

-26-

<

<

<

Various factors affect the interval between periodic calibrations. Exposure to certain contam inants in the air, accum ulation of contam inants on the filter, or an extended period of norm al operation can cause changes in sensitivity. Since each application is different, the length of tim e between regularly scheduled calibrations can vary from one installation to the next. In general, the m ore a system is checked, the greater the reliability. A calibration m ust be perform ed: when a new system is initially put into service, when the sensor is replaced, or when a controller is replaced.

IMPORTANT

To ensure adequate protection, the detection system must be calibrated on a regularly scheduled basis.

The Controller uses a fully autom atic calibration procedure that requires no adjustm ents by the operator. The controller perform s the zero adjustm ents, then signals the operator when to apply and when to rem ove the calibration gas.

W hile in the Sensor Calibrate Mode, all controller outputs are inhibited, the current output is 3m A, and the Cal LED is illum inated.

NOTE

If the sensor is being replaced, refer to the 'Sensor Replacement' section (under

'Maintenance') in this manual for information regarding replacement and calibration of the sensor.

Calibration Procedure

1 The sensor should be allowed to stabilize for a m inim um of 4 hours, although it is best to allow 24 hours for the sensor to stabilize.

2 Be certain that the controller is properly program m ed for the gas concentration being used for calibration. (Refer to ‘SET-PO INT DISPLAY MODE’ to check program m ed value.) Reprogram the controller if required. (Refer to ‘DIP

SW ITCH SETTINGS.’) Failure to do so will greatly im pair system response.

NOTE

IT IS VERY IMPORTANT THAT POW ER TO THE CONTROLLER IS RECYCLED

AFTER ANY DIP SWITCH CHANGES, TO MAKE THE CHANGES TAKE EFFECT!

3

4

5

Be sure that only clean air is present at the sensor. The m icroprocessor begins taking zero readings im m ediately upon entering the Calibrate Mode. If the possibility of background gases exists, purge the sensor with clean air to assure an accurate calibration.

Enter the Main Menu, activate the MENU/SET reed switch repeatedly until ‘CAL’ is shown on the right digital display, then m om entarily activate the

SELECT/RESET reed switch.

Once in the sensor calibrate m ode, the right digital display will continue to show

‘CAL’ and the left digital display will show ‘Chn’. Activate the MENU/SET reed switch repeatedly until the desired channel is shown on the left digital display, then m om entarily activate the RESET/SELECT reed switch.

-27-

6 Once the required channel has been selected, the controller will autom atically start taking zero readings. The left digital display will show ‘Air’ and the right display will flash a value close to zero. W hen the zero calculations are com plete

(30 seconds m inim um ), the right digital display stops flashing and reads '00'; the left display will now alternately display ‘gAS’ and ‘in’.

7

8

Apply the calibration gas to the sensor. The right digital display starts to flash, and the value indicated on the display rises. The bar graph display also indicates the level of gas at the sensor, but does not flash. The left display will show ‘gAS’.

W hen the m icroprocessor has com pleted the gain adjustm ents (30 seconds m inim um ), the right digital display stops flashing and the left display will alternately display ‘Cut’ and ‘gAS’.

9 Rem ove the calibration gas. W hen the gas level falls to half the low alarm set-point, the controller autom atically returns to the norm al operating m ode.

If another sensor m ust also be calibrated, return to step 1.

10

If the operator fails to com plete the calibration procedure or if the sensitivity of the sensor has deteriorated to the extent that calibrations cannot be successfully com pleted, a calibration fault

(‘E2X’ status) will be generated. The system will autom atically revert to the form er calibration settings (after 10 m inutes or when the gas level drops below the lowest set-point). If a successful calibration cannot be accom plished, replace the sensor and calibrate (refer to the transm itter/sensor m anual, as som e transm itters will have gain jum pers which need to be changed and the sensor m ay still be useful).

If the m icroprocessor determ ines that the sensor is approaching the end of its useful life or the gain jum per on the transm itter needs to be changed, ‘E10' will be indicated on the digital display.

This does not indicate a system m alfunction, but is intended to notify the operator of this condition.

A successful calibration can still be perform ed, but the operator should be prepared to change the sensor at the tim e of the next calibration. Activate SELECT/RESET after com pleting calibration to clear the display.

SENSO R REPLACEM ENT M ODE (SrP)

This m ode inhibits all controller outputs to allow replacem ent of the sensor(s) without rem oving power from the controller. Alarm set-points and calibration gas concentration are not affected.

The left display will show ‘SrP’ while in the sensor replace m ode. The right display will show the status of the sensor being replaced (‘NoS’ m eans no sensor is connected). The fault LED is on and the fault relay is de-energized. The channel LED will be on for the sensor being replaced.

All other sensors rem ain active during sensor replace m ode. If an alarm condition occurs on one of the active channels while in this m ode, the appropriate channel LED will flash and relays will act accordingly. All other display features will be inhibited. In order to exit this m ode the

SELECT/RESET reed switch m ust be activated. The controller will perform a power-up count down (45 or 90 seconds) for the replaced sensor, and the affected current output will drop to 1m A.

SPECIAL FUNCTION MENU SELECTIONS

FORCED CURRENT OUTPUTS (FoP)

-28-

The forced current output m ode is used to check the current output calibration and the operation of any devices connected to the current outputs.

To enter the forced current output m ode, enter the special function m enu. W hen ‘FoP’ is shown on the right display, activate the SELECT/RESET reed switch. Upon successful entry into this m ode the left display will flash ‘gPn’. Activate the MENU/SET reed switch until the desired area output is reached (‘GPA’ = Area 1 and ‘GPb’ = Area 2), then activate the SELECT/RESET reed switch.

W hen an area has been chosen for forced current output, the left display will alternate between

‘GPX’ and ‘FoP’ and the right display will show what type of current output (in gas concentration) is being placed on the current output line.

The push-button switches are used to change the current output. To exit this function, hold the

SELECT/RESET reed switch down until ‘rtn’ is shown on the right display. Release the reed switch, and the controller will return to the norm al operating m ode in 10 seconds if no reed switches are pushed.

CURRENT CALIBRATION M ODE (CuC)

The next selection in the special function m enu is the current calibration m ode. This m ode is selected to calibrate the current outputs. The Area output to calibrate is chosen as in the Forced

Current Output Mode. Once an area has been selected, the left display will alternate between

‘CuC’ and the area that is being calibrated (‘GPX’). The right display will show a constant which will rise and fall as the current is adjusted (does not show the current on the outputs). Place a m illiam p m etre between the Area current output and system com m on. Use the m agnetic reed switches to raise and right the current. Once the current m easured is as close to 4m A as possible, do not activate any reed switches for 10 seconds and the constant shown on the right display will change to a m uch higher num ber. This tells the operator that it is tim e to calibrate the higher end of the current output range. Use the m agnetic reed switches to bring the current level as close as possible to 20m A. Do not activate any reed switches for 10 seconds and the constant shown on the display will change to a lower num ber. Now it is tim e to calibrate the current output to 3m A for when the controller is in the calibration m ode. Once this current level is set, do not activate any reed switches for 10 seconds and the controller will return to the norm al operating m ode.

ADDRESS SET M ODE (Adr Set) (Do not use)

Do not use the next selection in the special function m enu. It is the address set m ode, used to set the controllers address for the CAN system . W hen the left display shows ‘Adr’ and the right display shows ‘SEt’ activate the SELECT/RESET reed switch. The left display will alternate between ‘Adr’ and ‘SEt’ and the right display will show the current address. Use the m agnetic reed switches to raise and lower the address. Once the address is correct, do not activate any reed switches for 10 seconds and the controller will return to the norm al operating m ode.

CHANNEL DISPLAY(Chd)

In this m ode, the displays can be forced to m onitor only one channel, as long as no alarm s are occurring. If any alarm occurs, the controller will return back to the Norm al Operating Mode for the situation when an alarm is occurring.

Enter the Special Function Menu, activate the MENU/SET reed switch repeatedly until ‘Chd’ is displayed on the right digital display, then m om entarily activate the SELECT/RESET reed switch.

The left digital display will show ‘Chn’. Activate the MENU/SET reed switch repeatedly to toggle through the channels (CH1, CH2, CH3, or CH4). To select a channel, m om entarily activate the

-29-

SELECT/RESET reed switch when the required channel is displayed, on the left digital display.

The displays will now only display the inform ation for the chosen channel.

To return to the norm al operating m ode, enter the m anual display m ode again and instead of selecting a single channel, select ‘ALL’.

BYPASS (bPS)

The bypass m ode is entered through the special functions m enu. Enter the special functions m enu and activate the MENU/SET reed switch repeatedly until ‘bPS’ is shown on the right digital display, then m om entarily activate the SELECT/RESET reed switch. The right digital display will still show ‘bPS’ and the left display will show ‘gPn’. Select the group to put in bypass m ode by activating the MENU/SET reed switch repeatedly until the desired group is shown, then activate the SELECT/RESET reed switch m om entarily.

W hile in bypass m ode, the alarm outputs for the selected group(s) are inhibited. The HIGH alarm relay is com m on to both groups, and is inhibited even if the unselected group has an alarm condition. CAUTION SHOULD BE USED W HILE IN BYPASS M ODE.

To exit the bypass m ode, activate the SELECT/RESET reed switch m om entarily.

OPERATING MODES

RESET M ODE

The Reset Function is entered by activating the SELECT/RESET reed switch located on the front panel of the controller. (Refer to Figure 2.) W hen the SELECT/RESET reed switch is activated

m om entarily, all LEDs turn off and all outputs return to their norm al condition if no alarm s or faults are occurring.

FORCED RESET M ODE

If any of the channels gets a reading beyond 100% of full scale, a reset will not clear the alarm s, even if the channel has returned to levels below the low alarm set point. The error resulting from this occurrence m ust be cleared in the error check m ode and then a forced reset m ust be applied.

To apply a forced reset, activate the SELECT/RESET reed switch for 1 second, the LEDs turn off and the outputs return to their norm al condition. Rem ote reset perform s a forced reset.

NOTE

The remote reset performs a reset function only. It cannot be used for other controller functions.

NORM AL OPERATING M ODE

The following discussion covers the situation where no fault condition is occurring. Refer to

‘FAULT IDENTIFICATION’ for a discussion on faults.

In the Norm al Operating Mode with no alarm :

<

<

The digital and bar graph displays are on and indicate the sensor(s) input(s). If only one channel is active, then the displays will stay on that channel; if two or m ore channels are active, the displays will sequentially display the channels, for 5 seconds each. The left digital display will indicate the channel (CH1, CH2, CH3, or CH4) and the right digital display will indicate the sensor reading.

The Channel LEDs will indicate which channel the digital display is referring to.

-30-

<

<

<

<

<

<

<

<

<

All other LEDs are off.

Alarm relays are in their norm al state, energized or de-energized as program m ed.

Fault relay is energized.

In the Norm al Operating Mode with a low alarm (s) condition occurring:

Digital and bar graph displays indicate the sensor input(s) as outlined above.

If one channel is in alarm , the system will stay at that channel.

If m ore than one channel is in alarm , the channel with the ‘highest’ alarm condition will be displayed. The channel LED of other channels will flash to notify that an alarm condition exists. To force the display of a channel with a ‘lower’ alarm , go into the Forced Display

Mode, as outlined in the next section.

Low LED flashes.

Low alarm relay changes state.

Fault relay is energized and fault LED is off.

W hen the signal decreases below the low set-point:

<

<

<

<

The digital display and bar graph display continue to track the sensor input.

W ith latching operation program m ed, low alarm relays will not change.

W ith non-latching operation program m ed, low alarm relays will return to their norm al state.

Low Alarm LEDs are on steady, while the affected channel is displayed, until reset.

If a high alarm condition occurs, the m odule will be in a Level 3 Display Mode; the bar graph and digital display will cycle through all channels with a high alarm condition. W hile one channel is displayed, the channel LED for any other channel in a high or low alarm state will flash.

NOTE

W hen 1 or more channels are in a high alarm condition and 1 or more channels are in a low alarm condition, only the channels in the high alarm condition will be cycled on the display. The channel LED for any channel in the low alarm condition will flash.

If one or more channels reach an ‘over-range’ (>100% of full scale) condition, the error must be cleared in the error check mode and then a forced reset must be performed once the channel has returned to normal. A basic reset will not clear an over-range error.

FORCED DISPLAY (FdP)

In the norm al operating m ode with no alarm s occurring, the digital and bar graph displays will sequentially display each of the channel sensor readings. If an alarm condition occurs, the displays will rem ain on the channel with the alarm (or ‘highest’ alarm if m ore than one channel is in an alarm condition). In this situation, the forced display m ode can be used to tem porarily view the sensor readings of the other channels.

To enter the Forced Display Mode, activate the MENU/SET reed switch for 2 seconds, until the right digital display shows ‘FdP’. Mom entarily activate the SELECT/RESET reed switch to select this function. The digital displays will then sequentially display each of the active channels once before returning to the Norm al Operating Mode autom atically.

Unit V

SYSTEM MAINTENANCE

-31-

ROUTINE MAINTENANCE

To ensure reliable protection, it is im portant to check and calibrate the detection system on a regularly scheduled basis. The frequency of these checks is determ ined by the requirem ents of the particular installation.

M ANUAL CHECK OF OUTPUT DEVICES

Fault detection circuitry continuously m onitors for problem s that could prevent proper system response. It does not m onitor external response equipm ent or the wiring to these devices. It is im portant that these devices be checked initially when the system is installed, and periodically during the ongoing m aintenance program .

SYSTEM CHECK IN NORM AL M ODE

The system m ust be checked periodically in the Norm al Operating Mode to ensure that those item s not checked by the controller diagnostic circuitry (such as output relays) are functioning properly.

**CAUTION**

Be sure to secure all output devices actuated by the system to prevent unwanted activation of this equipment, and remember to place these same output devices back into service when the checkout is complete.

SENSOR REPLACEM ENT

The area m ust be declassified or power to the sensor m ust be rem oved prior to replacing the sensor in a hazardous area.

11

12

Enter the Main Menu; m om entarily activate the SELECT/RESET reed switch once the m essage ‘SrP’ appears on the right digital display

Once in the sensor replace m ode, the right digital display will continue to show

‘SrP’ and the left digital display will show a channel selection: CH1, CH2, CH3, or

CH4

13

If the channel that is first displayed corresponds to the senor to be replaced, m om entarily activate the SELECT/RESET reed switch to select that channel. If the first channel displayed is not the required channel, activate the MENU reed switch; the left digital display will sequentially display the operational channels each tim e the MENU/SET reed switch is activated. Activate the SELECT/RESET reed switch, once the required channel is displayed.

Once the required channel has been selected, the display reads '00' and the

Channel LED and Fault LED are illum inated. The controller is in the Sensor

Replacem ent Mode.

Once in the Sensor Replacem ent Mode follow the instructions in the sensor m anual for replacem ent.

NOTE

If power was removed from the controller during the sensor replacement procedure, the controller will automatically return to the Normal Mode when power is restored (after a 45 or 90 second time delay). To prevent the possibility of alarms, allow the system to warm up in the Sensor Replacement Mode.

-32-

An adequate supply of spare sensors should be kept on hand for field replacem ent. For m axim um protection against contam ination and deterioration, they should not be rem oved from the original protective packaging until the tim e of installation.

TROUBLESHOOTING

Table 10 is intended to serve as an aid in locating the cause of a system m alfunction. If this table is not helpful, contact an authorized repair person.

REPLACEMENT PARTS

should develop, first carefully check for proper wiring, program m ing and calibration. If it is determ ined that the problem is caused by an electronic defect, the device m ust be returned to the factory for repair.

NOTE

W hen replacing a controller, remove power before removing the device from the enclosure or installing the replacement unit.

The sensor is not intended to be repaired. W hen calibration can no longer be properly perform ed, the sensor m ust be replaced. The frequency of replacem ent will be determ ined by the am ount and type of contam ination present at the particular installation. An adequate supply of spare sensors should be kept on hand for field replacem ent. Always calibrate the sensor after it has been replaced.

DEVICE REPAIR AND RETURN

The electronics are under full warranty for THREE years (from date of purchase) and the sensors are under warranty for 2 years. Net Safety Monitoring Inc. supplies all distributors with advance replacem ent units. These units are available to the user during the warranty period. This allows

Net Safety Monitoring Inc. to take the tim e to repair the unit com pletely while custom ers keep their operations running sm oothly with the advance replacem ent unit.

Prior to returning devices or com ponents, contact the nearest local distribution office so that an

RMI (Return Material Identification) num ber can be assigned. A written statem ent describing the m alfunction m ust accom pany the returned device or com ponent to expedite finding the cause of the failure, thereby reducing the tim e and cost of the repair to the custom er. Pack the unit or com ponent properly. Use sufficient packing m aterial in addition to an anti-static bag or alum inum backed cardboard as protection from electrostatic discharge.

-33-

PRO BLEM

No Faceplate indicators illum inated.

<

<

POSSIBLE CAUSE

W iring to external power source.

Input power failure.

FAULT LED on, digital display blank.

<

<

Power-up tim e delay (45 seconds).

If condition continues after 45 seconds, repeat power-up. If a problem continues, check dip switches or replace detector.

E90 to E97 Status

E96 Status

E70 Status

<

<

<

Initialization failure. Repeat power-up. If successful, reprogram and re-calibrate. If not, replace detector.

Input power problem . Check operation of power source and power wiring.

External reset activated for over 15 seconds. Check external switch and wiring.

E40 Status

E30 Status

<

<

<

<

<

<

Sensor input problem . Check sensor and/or transm itter wiring and calibration.

Faulty sensor. Replace and calibrate.

Faulty transm itter. Replace and calibrate.

Negative zero drift. Calibrate sensor.

Faulty sensor. Replace and calibrate.

Faulty transm itter. Replace and calibrate.

E20, E21 Status

E22, E23 Status

<

<

Calibrate error. Re-calibrate.

Sensor sensitivity out of tolerance. Calibrate transm itter. If problem continues, replace sensor and calibrate.

E10 Status <

Table 10 - Troubleshooting Guide

Sensor reaching end of life - no problem at present tim e. Be prepared to replace sensor at next calibration (calibration attem pt m ight fail).

Appendix A

-34-

Net Safety Monitoring Inc.

Electrostatic Sensitive Device Handling Procedure

W ith the trend toward increasingly widespread use of m icroprocessors and a wide variety of other electrostatic sensitive sem iconductor devices, the need for careful handling of equipm ent containing these devices deserves m ore attention than it has received in the past.

Electrostatic dam age can occur in several ways. The m ost fam iliar is by physical contact.

Touching an object causes a discharge of electrostatic energy that has built up on the skin. If the charge is of sufficient m agnitude, a spark will also be visible. This voltage is often m ore than enough to dam age som e electronic com ponents. Som e devices can be dam aged without any physical contact. Exposure to an electric field can cause dam age if the electric field exceeds the dielectric breakdown voltage of the capacitive elem ents within the device.

In som e cases, perm anent dam age is instantaneous and an im m ediate m alfunction is realized.

Often, however, the sym ptom s are not im m ediately observed. Perform ance m ay be m arginal or even seem ingly norm al for an indefinite period of tim e, followed by a sudden and m ysterious failure.

Dam age caused by electrostatic discharge can be virtually elim inated if the equipm ent is handled only in a static safeguarded work area and if it is transported in a package or container that will render the necessary protection against static electricity. Net Safety Monitoring Inc. m odules that m ight be dam aged by static electricity are carefully wrapped in a static protective m aterial before being packaged. Foam packaging blocks are also treated with an anti-static agent. If it should ever becom e necessary to return the m odule, it is highly recom m ended that it be carefully packaged in the original carton and static protective wrapping.

Since a static safeguarded work area is usually im practical in m ost field installations, caution should be exercised to handle the m odule by its m etal shields, taking care not to touch electronic com ponents or term inals.

In general, always exercise all of the accepted and proven precautions that are norm ally observed when handling electrostatic sensitive devices.

A warning label is placed on the packaging, identifying those units that use electrostatic sensitive sem iconductor devices.

*P ublished in Accordance with E1A standard 471

-35-

Appendix B

SW 4.6

SW 4.7

SW 4.8

SW 5.1

SW 5.2

SW 5.3

SW 5.4

SW 5.5

SW 5.6

SW 5.7

SW 5.8

DIP SW ITCH

SW 3.1

SW 3.2

SW 3.3

SW 3.4

SW 3.5

SW 3.6

SW 3.7

SW 3.8

SW 4.1

SW 4.2

SW 4.3

SW 4.4

SW 4.5

Record Of Dip Switch Settings

ON OFF

-36-

Appendix C

Wire Resistance In Ohms

Distance

(Feet)

AW G #20 AW G #18 AW G #16 AW G #14 AW G #12 AW G #10 AW G #8

500

600

700

800

900

100

200

300

400

1.02

2.03

3.05

4.06

5.08

6.09

7.11

8.12

9.14

0.64

1.28

1.92

2.55

3.20

3.83

4.47

5.11

5.75

0.40

0.08

1.20

1.61

2.01

2.41

2.81

3.21

3.61

0.25

0.51

0.76

1.01

1.26

1.52

1.77

2.02

2.27

0.16

0.32

0.48

0.64

0.79

0.95

1.11

1.27

1.43

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0.90

1000

1250

1500

1750

2000

2250

2500

3000

3500

4000

10.20

12.70

15.20

17.80

20.30

22.80

25.40

30.50

35.50

40.60

6.39

7.99

9.58

11.20

12.80

14.40

16.00

19.20

22.40

25.50

4.02

5.03

6.02

7.03

8.03

9.03

10.00

12.00

14.10

16.10

2.53

3.16

3.79

4.42

5.05

5.68

6.31

7.58

8.84

10.00

1.59

1.99

2.38

2.78

3.18

3.57

3.97

4.76

5.56

6.35

1.09

1.25

1.50

1.75

2.00

2.25

2.50

3.00

3.50

4.00

4500

5000

5500

6000

6500

7000

7500

8000

45.70

50.10

55.80

61.00

66.00

71.10

76.10

81.20

28.70

32.00

35.10

38.30

41.50

44.70

47.90

51.10

18.10

20.10

22.10

24.10

26.10

28.10

30.10

23.10

11.40

12.60

13.91

15.20

16.40

17.70

19.00

20.20

7.15

7.94

8.73

9.53

10.30

11.10

12.00

12.70

4.50

5.00

5.50

6.00

6.50

7.00

7.49

7.99

2.82

3.14

3.46

3.77

4.08

4.40

4.71

5.03

9000 91.40

57.50

36.10

22.70

14.30

8.99

5.65

10 000 102.00

63.90

40.20

25.30

15.90

9.99

6.28

NOTE: RESISTANCE SHO W N IS ONE W AY. THIS FIGURE SHO ULD BE DOUBLED W HEN

DETERMINING CLOSED LOOP RESISTANCE.

0.63

0.79

0.94

1.10

1.26

1.41

1.57

1.88

2.21

2.51

0.06

0.13

0.19

0.25

0.31

0.38

0.44

0.50

0.57

-37-

2721 Hopewell Place NE

Calgary, Alberta, Canada, T1Y 7J7

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