General Monitors 2280A Four Channel H2S Gas Monitor Instruction manual
Below you will find brief information for Model 2280A. This Four Channel Control Module is designed for Hydrogen Sulfide Gas Applications. It features capabilities like Auto-Calibration and is equipped with LED indicators for High, Low, Fault, Calibration, and Setup statuses. Each channel has Mode Button, Digital Display in ppm, High, Low and Fault relays. It can be used with battery back-up and has analog output connection.
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Model 2280A
Four Channel Control Module
Hydrogen Sulfide Gas Applications
The information and technical data disclosed in this document may be used and disseminated only for the purposes and to the extent specifically authorized in writing by General
Monitors.
General Monitors reserves the right to change published specifications and designs without prior notice.
Part No.
Revision
MAN2280
MAN2280A
D/08-07
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Model 2280A
Table of Contents
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Model 2280A
Interconnection Drawing Zone Control Model 2280A Controller ................................39
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Model 2280A
Figures
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Model 2280A
List of Tables
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Model 2280A
Introduction
Protection for Life
General Monitors’ mission is to benefit society by providing solutions through industry leading safety products, services, and systems that save lives and protect capital resources from the dangers of hazardous flames, gases, and vapors.
This manual provides instruction for installing and operating the General Monitors
Model 2280A Four Channel Control Module for Hydrogen Sulfide Gas Applications.
While the 2280A system is easy to install and operate, this manual should be read in full, and the information contained herein understood, before attempting to place the system in service.
The safety products you have purchased should be handled carefully and installed, calibrated, and maintained in accordance with the respective product instruction manual. Remember these products are for your safety.
Special Warning
Through engineering design, testing, manufacturing techniques, and rigid quality control, General Monitors (GMI) supplies the finest gas detection systems available.
The user must recognize his responsibility for maintaining the gas detection system in operational condition.
The Model 2280A Four Channel Hydrogen Sulfide Gas Monitor contains components, which can be damaged by static electricity. Special care must be taken when wiring the system, to ensure that only the connection points are touched.
General Monitors cautions, as with all equipment of this type, that high levels or long exposure to certain atmospheres will “degrade” the sensor and eventually affect
sensitivity. Please refer to Section 2.6.3 for specific information. Use in such
atmospheres requires calibration checks on a more frequent schedule than normal.
General Monitors should be consulted for an application feasibility determination, before installing a system in such atmospheres.
General Monitors’ sensors and sensor housings are designed and tested for use in certain classes of hazardous atmospheres. Explosion-proof integrity cannot be maintained, if sensors and sensor housings are operated in other than the “as designed” condition. Terminal access covers of sensor housings must be securely fastened. Sensor housing must be installed in accordance with National Electrical
Code acceptable practices, for the class of hazardous atmosphere.
Sensors are designed with sintered metal, or screen covers, that act as flame arrestors. Do not operate sensors without screen or sintered metal parts in place.
General Monitors’ gas detection systems are primarily safety devices for the protection of personnel and facilities and must be “always ready”. With proper
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Model 2280A
installation, calibration, and maintenance, the system provides continuous monitoring of hazardous areas. The user must assume all liability for misuse of General
Monitors’ gas detection systems.
The system’s full two-year warranty will be voided if customer personnel, or third parties, damage the system during repair attempts.
Customer Support
For additional product information not contained in this manual, please contact
General Monitors Customer Support. For contact information, see Section 6.1.
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Model 2280A
1.0 Before Installation
1.1 Differences Between Models 2280A and 2280
2280A differences:
• Auto-Calibration
• Front Panel: Polycarbonate with inlay
Refer to Section 2.0, Installation, and Section 3.0, Startup and Operation, for
details.
1.2 General Product Description
The Model 2280A is a four-channel controller with four individual sensor circuits. The controller should be mounted in a weather protected non-hazardous area. Several
GMI accessories are available for panel, wall or 19-inch rack installation. For hazardous areas, an explosion proof housing is available for Class I, Division 1 and
Division 2, Groups B, C and D.
NOTE: Sensor assemblies may be mounted outdoors in hazardous areas (National
Electric Code Class 1, Division 1 and Division 2, Groups B, C, and D).
The Model 2280A Hydrogen Sulfide (H
2
S) Monitor has evolved from earlier GMI systems, which have an established reputation for reliable performance. By carefully following the instructions in this manual, you can be assured of the most dependable, continuous protection against hazardous accumulation of hydrogen sulfide gas.
Except for periodic calibration checks, there are no routine maintenance requirements. The Model 2280A Controller is a microprocessor-based instrument, which features recent advancements in electronic circuitry and packaging techniques.
The system’s sensor is a second-generation product, incorporating advancements in sensor technology and performance.
NOTE: The 2280A is different than its predecessor the 2280. The 2280A calibration is automatic where the 2280 must be manually calibrated.
Please check the individual manuals for details about wiring, set up, and operation of these two units.
CAUTION:
The Model 2280A Controller is easy to install and operate. However, one should fully read and understand this manual before attempting to place the system in service.
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Model 2280A
Figure 1: Model 2280A
1.3 Controller
The Model 2280A is a four-channel system where the controller continuously monitors the inputs of four sensors. The sensors are monitored independently (i.e. they are not scanned, nor are the signals summed).
Each channel has the following:
• LED indicators for High, Low, Fault, Calibration, and Setup
• Mode Button, accessed by using a small screw driver
• Digital Display in ppm
• High, Low and Fault relays
NOTE: Standard configuration is common relay
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Model 2280A
NOTE: A service-loop is necessary between the Model 2280A Controller’s rear panel terminals and field/power wiring. This service loop permits the controller to be removed or slid forward for servicing. This service loop is a definite advantage when replacing or changing a controller.
Four sensor assemblies are normally supplied with the system. These assemblies are comprised of the sensor, the sensor housing, and an optional splashguard.
NOTE: This sensor assembly is CSA approved for Class I, Division 1 and Division 2,
Groups B, C & D hazardous areas.
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Model 2280A
2.0 Installation
2.1 Location of the Controller
The Model 2280A controller should be installed in a weather-protected, nonhazardous area. The following hardware is available to assist installation:
Part Description
98 mm (4”) panel mount frame
483 mm (19”) rack mount frame
98 mm (4”) blank panel
98 mm (4”) wall mount bracket
Part Number
10199-1
10200-1
10191-2
10202-1
NEMA 7 explosion-proof enclosure 10099
Desk top cabinet (up to four controllers) 914-006
Table 1: Model 2280A Mounting Parts
The following are guidelines for mounting the controller:
• To minimize the possibility of electrical shock, mounting must be as free from shock and vibration as possible, in a grounded enclosure that requires a tool for instrument removal.
• Even though the controller is RFI resistant, do not mount the controller in close proximity to radio transmitters or similar equipment.
• Care should be taken to assure adequate ventilation.
• Do not mount the controller in a manner that restricts the natural convection airflow from normal ambient air.
• The controller operating temperature range is 0°C to 60°C (32°F to 140°F).
The Model 2280A operates on a nominal line voltage of 117 VAC, 50-60 Hz, 220
VAC operation is optionally available.
Note: To eliminate accidental shutdown, GMI does not provide a power ON-OFF switch. Power must remain disconnected until all other wiring connections are made.
The following are wiring guidelines for the 2280A Controller:
If AC is to power the system, connect the line power supply to the terminals
L, N, and GND located at the rear of the controller. Use accepted commercial wiring practices.
Primary DC power may be used instead. Use any 24VDC nominal supply with a minimum rating of 2 amperes.
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Model 2280A
Large gauge wire (up to No. 14) should be used to prevent excessive voltage drop.
Wiring runs should be as short as possible.
Connect the positive supply to 24VDC (+) and the negative return 24VDC (-) on the terminal block. An internal diode protects the system in the event of inadvertent supply polarity reversal.
An emergency battery backup can be used on a system normally operated by AC.
The battery rating (ampere-hour capacity) is dictated by the length of time power outages may last. A Model 2280A Controller requires approximately 2 ampere (peak) at 24 VDC. General Monitors recommends that a Lead-Acid type battery be used.
This type of battery can be expected to last for several years with minimum maintenance.
The customer furnished battery may be connected as shown in Figure 2. No manual
or relay switching is required. In order to keep the 24V lead acid battery (whose voltage is approximately 27VDC when fully charged) continuously charged through the series diode, a regulated 28VDC power supply should be used. The cable lengths should be kept as short as possible. Should AC power to the regulated DC power supply fail, energy to run the system will be obtained from the fully charged lead acid battery. A 24 ampere-hour capacity battery should power one Model 2280A controller with four sensors for at least 12 hours. DO NOT USE MORE THAN A 24-
VOLT BATTERY.
Figure 2: Schematic Battery Backup System
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Model 2280A
2.4 Analog Output Connection
CAUTION: The Analog Output must either be used or jumpered. If not, the Model
2280A indicates a fault in the normal mode with the display reading “A0” and the Fault LED flashing.
The two analog output terminals, AO (+) and AO (-), are located at the rear of the unit. The maximum series resistance permitted is 600-ohms. For a 250-ohm resistor in series the voltage produced across the resistor by the 4-20mA signals is 1 to 5
VDC. A differential input amplifier must sense this voltage, as the analog output current cannot be diverted to any external reference potential.
Remote reset (of the alarm relays) is made to the rear panel of the Model 2280A and should be connected between the RESET and 24VDC(-) terminals. A remote reset button must be a “normally open / momentary closed” type.
NOTE: If the system is to be powered from a primary DC power supply or if battery backup is provided, the 24VDC (-) terminal has two wires when remote reset is used. The diameter of the two wires cannot be larger than an AWG 14 wire.
2.6 Choosing Sensor Locations
There are no hard and fast rules governing the selection of sensor locations. The customer must evaluate conditions at their own facility to make this determination.
However, the following general suggestions should be considered with regard to particular conditions at the site where a Model 2280A is being installed.
2.6.1 Likely Sources of Gas Emission
In general, at least one sensor should be located in close proximity to each point where Hydrogen Sulfide (H
2
S) gas is most likely to escape into the air. Consideration should also be given to placing sensors at locations where the H
2
S may be carried by local air currents, ventilation equipment, etc.
Avoid installing sensors where they will be unnecessarily exposed to wind, rain, dust, water, shock or vibration. For the temperature range limitations of sensors covered,
Sensors may be adversely affected by prolonged exposure to certain materials. Loss of sensitivity or corrosion may be gradual if such materials are present in low concentrations, or it may be rapid at high concentrations. The more important materials adversely affecting sensors are:
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Model 2280A
• Halides: compounds containing Fluorine, Chlorine, Bromine and Iodine chemically attack the sensor. They instead, coat it and therefore reduce or stop its response to H
2
S.
• Caustic liquids or vapors
The presence of such materials in an area does not preclude the use of a sensor.
The feasibility of using a sensor in such areas must be determined by an analysis of the specific factors in each application. Consult General Monitors before attempting any such installation.
Sensors used in these areas usually require more frequent calibration checks than normal and typically have a shorter life. In many such applications the normal twoyear warranty does not apply.
CAUTION: General Monitors discourages the painting of sensor assemblies. If the sensor head is painted-over, gas will not be able to diffuse into the sensor and many paints contain lead, which can poison a sensor.
2.7 Sensor Installation
The standard sensor assembly consists of a sensor housing (GMI P/N 10252-1) and
sensor (P/N 50445-1, -5, or -9), (Figure 3).
NOTE: When installing the sensors, be sure to leave enough clearance from the ground and walls to be able to fit the calibration bottles supplied with the system onto the sensor head.
The dash (-) numbers correspond to full-scale ranges of 0-100 ppm, 0-50 ppm or 0-
20 ppm, respectively. The sensor assembly is recognized safe for United States
National Electric Code Class I, Division 1 and Division 2, Groups B, C, and D hazardous areas, and is approved by the Canadian Standards Association (CSA).
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Model 2280A
NOTE: Each H
2
S Sensor is shipped with a red plastic cap fitted over the sensing head. Inside the cap is a desiccant. DO NOT remove this cap until power has already been applied to the system. Save the cap and re-cap the sensor when powering down the system or if the system power is off for an extended period of time. The desiccant packs may be saved and reused providing that they have been stored in a dry area.
CAUTION: Sensors should ALWAYS be mounted pointing downward to prevent the collection of moisture or contaminants.
To connect the cable to the sensor:
1. Remove the P/N 10252-1 housing lid to reveal the terminal strip. The sensor is connected in the housing according to color designations as follows:
Sensor Housing
Terminal Number
Sensor
Wire Color
1 White
2 Black
3 Red
4 Green
Table 2: Sensor Wire Colors
2. Install the sensor assembly with conduit in hazardous areas. A good design would include conduit seals to prevent water build-up.
3. Connect the cable so that the terminal color at the sensor housing matches the terminal color at the controller. General Monitors’ sensor leads are color coded, and should be connected to the rear Terminal Connector as shown in the following table:
Terminal Connector
Sensor Cable
Color
W1 White
B2 Black
R3 Red
G4 Green
Table 3: Sensor Cable Colors
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Model 2280A
The maximum cable length, using four conductor cable, should be such that the total loop resistance of any signal path (for example the black leads) does not exceed 20-
Ohms at 25º Celsius. The following table may be used as a guide to determine cable length versus wire size:
AWG Feet Meters
14 3,375 1,030
16 2,250 685
18 1,350 410
20 900 275
Table 4: Cable Length
In the event the system is to have less than four active channels, the sensor should be substituted with a sensor simulator for each unused channel. Otherwise, the unused channel will be in Fault condition (sensor failure).
NOTE: If sensors were matched with a specific channel at the factory, each one will be tagged accordingly. Check and match each sensor to the proper channel before installing it.
Two accessories are available which can be supplied with the system, if ordered:
• Splash Guard, P/N 10395-1
• Test Gas Applicator, P/N 10460-2
Both of these products are designed to provide extra protection in problem environments.
NOTE: Shielded cable should be grounded only at the controller, using the ground terminal provided. Care should be taken to insure that the outer braid does not contact the conduit or junction box.
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Model 2280A
Figure 3: Junction Box Assembly Sensor
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Model 2280A
2.8 Alarm Wiring Connections
The Model 2280A can be configured to have individual alarm and fault relays for each channel, or have a common set of relays (that is, any alarm of fault occurring on any of the four channels will cause a relay on the channel one card to activate). The alarm relays may be operated as normally de-energized or normally energized, and latching or non-latching.
The Low and High alarm contacts for customer use are DPDT (double pole, double throw), and are rated 4 amps at 115 VAC, resistive. The Fault alarm contact is SPDT
(single pole, double throw), 4 amps at 115 VAC, resistive. These contacts are brought out to terminals on the rear of the controller as follows:
ALARM RELAY
CONTACT CONDITION
OPEN COM
Fault 2
Low Alarm 2,3
High Alarm 2,3
CLOSED
C 1
C 1,4
C 1,4
Table 5: De-Energized Alarm Relay Contacts
The above chart shows the High and Low alarm contacts in the standard deenergized state (with power applied). These two alarm relays are normally deenergized unless specially ordered for normally energized operation. The Fault relay
is always supplied normally energized.
If normally energized, the terminations are:
ALARM RELAY
CONTACT CONDITION
OPEN COM CLOSED
Low Alarm
High Alarm
1,4
1,4
C
C
2,3
2,3
Table 6: Energized Alarm Relay Terminations
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Model 2280A
CAUTION: Inductive loads, such as bells, buzzers, relays, contactors, solenoid valves, etc., connected to the high alarm, low alarm and fault alarm relays must be clamped down as shown in the diagrams below.
Unclamped inductive loads can generate voltage spikes in excess of
1000 Volts. Spikes of this magnitude will cause false alarms and possible damage.
Figure 4: Protection Circuit for Relay Contacts
2.9 Multiple Controller Operation
Up to sixteen points of gas detection utilizing one set of alarm relays may be configured by interconnecting the “=”, “H”, and “M” terminals of TB2 at the rear of four
Model 2280A controllers. Each Specific terminal, such as the “H” terminal, is connected from controller to controller using 20AWG wire (or larger). The controllers must be installed adjacent to each other, and the interconnecting wires kept as short as possible. By using two or three Model 2280A controllers, respectively, the same
method may be used to interconnect eight or twelve sensors (Figure 10).
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Model 2280A
Figure 5: Common Relay & Rear Terminal Connections
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Model 2280A
Figure 6: Discrete Relay & Rear Terminal Connections
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Model 2280A
3.0 Start Up and Operation
3.1 Types of User Interfaces
User interfaces are provided so that the operator may interpret and direct the Model
2280A in the performance of its various functions. User interfaces consist of a digital display, status indicators, a mode button, and a reset button.
• The digital display provides the user with the gas concentration at the sensor site, fault diagnostic codes, calibration prompts, and setup parameters.
• The status indicators provide the user with an indication of the current mode of operation: HIGH (High alarm), LOW (Low alarm), FAULT, CAL (Calibration or
Calibration Check modes) and SETUP (Setup and Setup Check modes).
• Mode button provides the user access to the Calibration, Calibration Check,
Setup, and Setup Check modes. The Mode button is accessed using a small screwdriver in the front of the unit.
Figure 7: Front Panel Display
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Model 2280A
3.2 Initial Application of Power
Before applying power for the first time, double-check all the wiring components. Insure that the sensor is correctly installed.
The system has a time delay feature. The High and Low alarm circuits are disabled for approximately 45 seconds after power is applied. This feature prevents false alarms while the sensor circuits are stabilizing.
At the initial application of power, the unit will enter a 45-second start-up mode. During this time, the display will read “SU”. The unit will then enter operational mode and the current gas concentration of the sensor will display. If a channel fault occurs, the FAULT
LED will flash, the fault relay will become active and the unit will display the appropriate error code. This fault indication is independent of the abovementioned time delay feature.
NOTE: A defect in one sensor circuit does not affect the operation of other channels.
3.3 Resetting Latched Alarms
The user may select a “latching” or “non-latching” alarm output for High and/or Low alarms. If an alarm output activates and the condition that caused that activation is no longer present, a non-latching alarm output resets automatically. A latched alarm output needs to be reset manually
Resetting latched alarm outputs is done with the Reset button located on the Channel 1 board. Pressing the Reset button resets any latched conditions that are no longer valid.
EXAMPLE: The sensor detects a gas concentration in excess of an alarm set point. The associated alarm outputs activate. After a few moments, the gas concentration drops below the alarm set point. If the alarm outputs are latched, the operator can press the Reset button and the latched alarm outputs returns to the normal (safe) state.
3.4 Analog Output
The Analog Output is a 0 to 21.7mA current signal with 4 to 20mA being proportional to 0 to 100% of full scale.
Analog Output Values
Signal Range 4-22mA
Fault <1.0mA
Start-up 4mA
Calibration
Detection Range
Over-Range
1.5mA
4-20mA
20 - 21.7mA
When a channel is in the Calibration, Calibration Check, Setup, or Setup Check modes, a
1.5mA signal is generated by this output. During Calibration mode the digital display
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Model 2280A
shows prompts associated with the calibration procedure. During Calibration Check
Mode, the digital display shows the gas concentration as a flashing digit, or pair of digits.
When a channel enters into a fault condition a 0mA signal is generated by this output.
During a fault, the display shows a fault code.
If the sensor attached to the channel is seeing gas in excess of 100% of full-scale, the output generates a signal between 20 and 21.7mA (not proportional).
3.5 Calibration Preparation Instructions
Before a full calibration or calibration check is begun, ensure the sensor assembly is seeing “clean air”. If the atmosphere at the sensor contains a low background of H
2
S observe the following procedure:
1. Obtain a GMI field calibrator plastic bottle (P/N 50000). Assure that it contains no H
2
S by flushing it with clean air. Place your hand or a cover over the bottle’s open end and take it to the sensor.
2. Place the bottle over the sensor.
3. Wait a few minutes for the sensor to become permeated with clean air.
4. Remove the sensor from the bottle.
After each use of the field calibrator bottle, clear the bottle of residual H
2
S gas by flushing it with clean air.
3.5.1 Gas Application Options
3.5.1.1 Breaker Bottles and Ampoules
General Monitors offers ampoules with breaker bottles as a method of reliably introducing calibration gas to the Model 2280A. The ampoule is placed inside the breaker bottle into the breaker slot, and the breaker bottle is placed over the sensor. The ampoule should contain 50% full-scale of H
2
S of the sensor range. For example, 100 ppm full-scale is a
50 ppm ampoule. Check the date code on the ampoule to make sure the expiration date
has not passed. Follow the calibration procedure below in Sections 3.6 and 3.7.
To apply gas using Breaker Bottles and Ampoules:
1. Remove cap and flush breaker bottle with fresh air.
2. Insert one ampoule into the ampoule holder. Replace the cap.
3. Place cap over the sensor and rotate bottle for a tight fit.
4. Turn knob clockwise until ampoule breaks.
5. Allow the sensor to see the gas for 1 to 2 minutes.
3.5.1.2 Portable Purge Calibrator
An alternate method for introducing calibration or test gas to the Model 2280A is available. The H
2
S Portable Purge Calibrator is a compact, practical, accurate and safe
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Model 2280A
system for field calibration of H
2
S sensors. The bottle is filled with a hydrogen sulfide
(H
2
S) in air mixture and is available in 7 concentrations. The temperature limitation for operation and storage is 0°F to +130°F (-18°C to +54°C). Make sure the Model 2280A has had power applied for at least 24 hours to ensure that the metal oxide film of the sensor has stabilized. Make sure the sensor is seeing clean air.
Figure 8: Portable Purge Calibrator
To Use the Portable Purge Calibrator
1. Place the calibration cup over the sensor.
2. Apply the gas by opening the ON/OFF valve on the cylinder.
3. Allow the sensor to see the gas for1 to 2 minutes.
NOTE: Do not store the cylinder with the regulator fully engaged in the cylinder valve.
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Model 2280A
3.6 Calibration Check Mode
This procedure is used to periodically check the response of an installed system to a known concentration of H
2
S gas that is at least 50% of the full-scale reading.
To perform a calibration check, use the following procedure:
NOTE: The Calibration Check mode cannot be entered if the channel is in alarm.
1. Enter the Calibration Check mode by pressing and holding the Mode button until the
CAL LED begins to flash (about ten seconds). The channel displays the calibration level. When the CAL LED begins to flash, release the Mode button. The channel is now in the Calibration Check mode.
2. When the Mode button is released, the display indicates a flashing pair of bars (--) for about ten seconds.
3. When the display indicates flashing digits, for example “0”, apply the test gas to the sensor. The display begins to go up scale as the sensor sees the gas. If no gas is applied, the channel returns to the normal operating mode after 12 minutes.
4. The reading stabilizes after 1 to 2 minutes of exposure to the test gas. This response time may increase due to the presence of the Dust Guard, Splash Guard or other sensor accessories.
5. If the sensor does see the gas, the read-out on the display flashes for as long as the unit remains in the Calibration Check mode. The operator should compare the reading with the gas concentration applied and determine if it is necessary to calibrate the sensor.
6. Remove the gas and expose the sensor to clean air. If the gas is not removed within
12 minutes, the channel reverts to a fault condition.
7. Press the Mode button. Calibration level is displayed for a short time, and the channel exits out of Calibration Check mode.
NOTE: Low and High alarms are disabled during Calibration Check mode.
3.7 Calibration Mode
This procedure is used for initial installation of the system. It is also used to re-calibrate the system if the controller or sensor is replaced, or if the calibration check is not within expected limits.
NOTE: For better results power up the sensor at least an hour before calibration. Make sure the calibration gas is the same concentration as the user specified calibration level. It is recommended to recalibrate after 24 hours.
To calibrate the Model 2280A:
1. Make sure the sensor is seeing clean air.
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Model 2280A
2. Enter Calibration mode by following the procedure for entering Calibration Check
mode in 3.6. Continue to press and hold the Mode button until the CAL LED
becomes steady, approximately fifteen seconds. When the CAL LED is steady, release the Mode button. The display shows flashing bars (--) for approximately 30 to
90 seconds. When the display changes from (--) to AC, clean air calibration is complete. The channel is now being calibrated at clean air.
3. When the channel displays AC, apply gas to the sensor. Watch the display change from AC to CP as the sensor detects gas. If the display does not change from AC to
CP after 12 minutes, the channel returns to normal operation.
4. After 2 to 5 minutes, the calibration routine is complete and the display changes from
CP to CC. If the display indicates F2 (failure to calibrate), remove the gas, wait 5 minutes then recalibrate.
5. Remove the gas and watch the display return to normal operation.
NOTE: Low and High alarms are disabled during Calibration mode.
Calibration can be aborted before the calibration gas has been applied.
To abort Calibration:
1. Wait until AC displays. Calibration cannot be aborted when “- -“ is flashing.
2. Press the Mode button and hold it for approximately 5 seconds. Release the button, after the calibration level displays.
3. The channel returns to normal operation.
3.8 Setup and Setup Check modes
The Setup Check mode allows the operator to view the selected options for the module without allowing any changes to be made. Once this mode has been entered, the module automatically displays each of the selected options for a short period of time and then it returns to normal operation. The Setup mode allows the operator to change the operating parameters by making choices for selected options.
The Setup Check & Setup modes display identical information with the following exceptions:
• The Setup Check mode allows the user to view the operating parameters of the channel, whereas the setup mode allows the user to change these parameters.
• Entering the optional password is only available in the Setup mode.
NOTE: The Setup and Setup Check modes cannot be entered if the channel is in alarm or fault.
During the Setup mode, the operator is allowed to select options. The selection procedure is the same for most of the options. Pressing the Mode button toggles the available choices. When the display has indicated a choice for five consecutive seconds,
22
Model 2280A
without the operator pressing the Mode button, the setup routine accepts that selection and moves on to the next option available.
NOTE: Before entering the Setup mode to make changes, the user should fill out the
Setup Mode Selection Table (Section 3.9). This aids the user during the selection
process in the Setup mode.
The Password, the High & Low alarm set points, and the Calibration Level options offer the operator more than two choices. While these options are being selected, pressing the
Mode button repeatedly, sequences the display to the next available choice for that option.
To enter the Setup Check mode:
1. Press and hold the Mode button until the SETUP LED begins flashing (about twenty seconds).
2. When the SETUP LED is flashing, release the Mode button to enter the Setup
Check mode
To enter the Setup mode:
1. Press and hold the Mode button until the SETUP LED begins flashing (about twenty seconds).
2. Continuing to press and hold the Mode button until the SETUP LED stops flashing
(about five seconds more).
3. When the SETUP LED stops flashing and stays on, release the Mode button and the unit enters the Setup mode.
3.8.1 Entering the Password
This option applies to the Setup mode only:
• If the Password option is enabled, the right digit of the display is blank and a “0” appears in the left digit on the display. Press the Mode button until the first number of your password displays, and then wait about five seconds.
• The left digit of the display blanks out and a “0” appears in the right digit on the display. Press the Mode button until your correct password number displays, then wait about five seconds. If the password is correct the unit proceeds to the
Password Enabled/Disabled option. If the password is incorrect the user cannot proceed and the unit returns to the normal operating mode. Once in the operating mode the user may re-enter the setup mode. The factory default password is 00.
3.8.2 High Alarm Options
Next, the HIGH LED is flashing while the energized/de-energized option displays. This option is available for discrete relays configuration only. The display indicates the current selection, (En or dE). Press the Mode button to toggle the selection. De-Energized (dE) is the factory default for this selection.
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Model 2280A
The HIGH LED on the front panel flashes while the latching/non-latching option displays.
The display indicates the current selection, (nL or LA). Press the Mode button to toggle the selection. Latching (LA) is the factory default for this selection.
The last High alarm option to appear on the display is the alarm set point (trip level). If this level is reached or exceeded, the High alarm outputs activate. The display indicates the current High alarm set point. Press the Mode button repeatedly, until the desired High alarm set point appears on the display. 60% of full-scale value is the factory default for this selection. In case of common alarms, this option is available at the master board only.
Measure
Range
High Alarm
(All Values in ppm)
Set Point
Range
Increment
0-100 5-95 5
0-50 2-48 2
0-20 1-19 1
Table 7: High Alarm Set Points
NOTE: The High set point cannot be set lower than the current Low set point. To accomplish this, you need to go through setup twice. The Low set point should be set lower than the desired High set point, then re-enter the Setup mode and set the High set point.
3.8.3 Low Alarm Options
Next, the Low LED flashes while the energized/de-energized option displays. This option is available only for discrete alarms configuration. The display indicates the current selection, (En or dE). Press the Mode button to toggle the selection. De-Energized (dE) is the factory default for this selection.
The Low LED on the front panel flashes while the latching/non-latching option is displayed. The display will indicate the current selection, (nL or LA). Press the Mode button to toggle the selection. Non-Latching (nL) is the factory default for this selection.
The last Low alarm option to appear on the display is the alarm set point (trip level). If this level is reached or exceeded, the Low alarm outputs activate. The display indicates the current Low alarm set point. Press the Mode button repeatedly, until the desired Low alarm set point appears on the display. The Low set point cannot be set higher than the
High set point. 30% of full-scale value is the factory default for this selection. In case of common alarms, this option is available at the master board only.
After the Calibration Level option has been selected, the Password Enabled/Disabled option displays. The display indicates the current selection, (PE or Pd). Press the Mode button to toggle the selection. Password Disabled (Pd) is the factory default for this selection.
24
Model 2280A
If password disabled is selected, the unit returns to normal operation. If this setting is changed from password disabled to password enabled, the user enters a new password.
The unit displays the left digit of the existing password (flashing on the display). The right digit is blank until the left digit has been selected. Press the Mode button repeatedly until the desired value displays. Once the left digit is correct, wait for five seconds and the right digit of the display begins flashing and the left digit is blank. Press the Mode button repeatedly, until the desired value displays.
Press and hold the Reset button for 5seconds. All LED and display segments will flash for as long as the Reset button is pressed. When the button is released the LEDs will return to their normal state reflecting the current status condition of each channel.
3.9 Setup Mode Selection Table
This section helps the operator make selections during the Setup mode. It is recommended that the operator fill-in the selections in the proper blanks and then use this page as a reference while programming the Model 2280A. The table shown below indicates the order of options in the Setup mode. To the right of the option is a description of the choices that are available for that option.
OPTION DESCRIPTION
Password
Enter the Password, if the Password is enabled
ENTER
SELECTION
Set the Energized (En) / De-Energized (dE)
Option
High Alarm
Options
Set the Latching (LA) / Non-Latching (nL) Option
Low Alarm
Options
Set the High alarm set point
Set the Energized (En) / De-Energized (dE)
Option
Set the Latching (LA) / Non-Latching (nL) Option
Set the Low alarm set point
Password
Options
Set the Password to be Disabled (Pd) or Enabled
(PE)
If the Password option to be changed from
Disabled to Enabled:
Set the password digits Left__________
Right__________
Table 8: Setup Display Options
25
Model 2280A
3.10 Check Points for Calibration and Operation
3.10.1 Frequency of Calibration
GMI recommends that the calibration be checked on each sensor at least every ninety
(90) days. If a sensor is installed where it may be subjected to splashing water, mud or dirt accumulation, or adverse gases, more frequent calibration is recommended. The exact frequency can vary with the severity of conditions and must be established in the field.
3.10.2 Replacing a Sensor
When a sensor is replaced, the new sensor must be calibrated. To avoid false alarms,
GMI recommends disabling all the alarm circuits until the sensor is calibrated. For better results, the sensor should be powered up at least 24 hours before calibration.
26
Model 2280A
4.0 Maintenance
Once installed, the Model 2280A Controller requires little or no routine maintenance, other than periodic calibration checks. General Monitors recommends that a calibration schedule be established and adhered to. GMI also recommends that a logbook be kept, showing calibration dates and dates of sensor replacement.
Considering the toxicity of hydrogen sulfide, General Monitors’ strongly recommends the period between calibrations should never exceed 90 days.
It is important that the owner/operator of this equipment determine the correct calibration schedule for their particular environment. Environmental conditions and contaminants can cause the frequency of calibration to be substantially shorter than 90 days. This is the only method of ensuring proper system operation and response to hydrogen sulfide.
More frequent calibration checks are encouraged to detect problems, such as mud collecting on the sensor heads; accidental painting over of sensors, etc. A calibration check is defined as the procedure of applying a known concentration of gas to the system sensors, while observing the controller. The visual display will indicate the gas concentration, and alarm indicators/circuits will activate in direct relationship to gas
concentration. Calibration adjustments must be made if results vary (Section 3.7).
4.2 Periodic System Verification
The following system verifications should be performed annually. Verify wiring, terminal connections and stability of mounting for all integral safety equipment including, but not limited to:
• Field detection devices
• Signaling / output devices
• Accessories connected to field and signaling devices
Proper system operation should be verified by performing a full, functional test of all component devices of the safety system, ensuring that the proper levels of alarming occur.
Fault/Malfunction circuit operation should be verified.
Calibration intervals should be independently established through a documented procedure, including a calibration log maintained by plant personnel or third party testing services.
27
Model 2280A
5.0 Troubleshooting
5.1 General
It is highly recommended that a spare sensor be on hand at all times. Sensor failure tends to be one of the potential causes of real downtime. A full complement of other GMI
recommended spare parts should also be on hand. (Please refer to Section 7.4.3).
In the event the system is to have less than four active channels, the sensor should be substituted with a sensor simulator for each unused channel. Otherwise, the unused channel will be in fault condition (sensor failure). It is recommended that defective controllers be returned to the factory for repair, even if the warranty has expired.
5.2 Troubleshooting Table
The information presented in the following table is designed to correct the more common problems, which appear during system startup and operation. Should the various actions suggested in the table fail to restore normal operation, we recommend that the factory be consulted and, if necessary, that the system be returned to the factory for repair.
This section is intended to be a guide in correcting problems that may arise in the field.
This section is not all-inclusive, and General Monitors should be contacted for assistance, if the corrective actions listed do not eliminate the problem. If equipment or qualified personnel required for various tests is not available, it is recommended that the defective unit be returned to General Monitors for repair. A complete written description of the problem should be included.
NOTE: If the equipment is under warranty, any repairs performed by persons other than
General Monitors’ authorized personnel may void the warranty. Please read the warranty statement carefully.
28
Model 2280A
5.3 Fault Codes
In addition to the Fault LED on the front panel, the Model 2280A provides a fault code on the digital display whenever a fault condition occurs. The Fault Codes that can appear on the digital display are:
FAULT
CODE
AO
DESCRIPTION SOLUTION
HI
LO
SE
F2
F3
F5
F6
F7
F8
F9
Open Analog Output Signal Check connections on rear terminal pins 5
& 6 and the analog output circuitry. If the problem is fixed, but “AO” is still displayed, restart the 2280A unit.
High Supply Voltage
Low Supply Voltage
Make sure the supply voltage level is within specification limits.
Make sure the supply voltage level is within specification limits.
Sensor Failure
Sensor heater connections are open, shorted, defective, or wired incorrectly.
Failed to Complete
Calibration
Make sure the sensor wires are connected properly (in the field and at the rear of the unit) and recalibrate if necessary. If this fault continues to occur, replace the sensor.
If this fault occurs, remove the gas and expose the sensor to clean air for at least five minutes. Then attempt another calibration. If the second attempt fails, replace the sensor. If this fault continues to occur after the sensor has been replaced, consult the factory or your GMI
Representative.
Software Checksum Error This fault occurs during initial power-up of the unit. If this fault occurs, remove and reapply power to the unit. If the fault continues to occur, consult the factory or your GMI Representative.
Reset Button Malfunction
Mode Select Button
Malfunction
EEPROM Verification Error for Calibration Storage
EEPROM Verification Error for Setup Storage
If the fault occurs, consult the factory or your GMI Representative.
If the fault occurs, consult the factory or your GMI Representative.
If the fault occurs, consult the factory or your GMI Representative.
If the fault occurs, consult the factory or your GMI Representative.
Calibration Check Period
Exceeded
If the calibration checks gas is left on the sensor for more than 12 minutes, this fault occurs. Remove the gas and expose the sensor to clean air.
Table 9:Troubleshooting Table
29
Model 2280A
6.0 Customer Support
6.1 General Monitors’ Offices
Area
UNITED STATES
Corporate Office
26776 Simpatica Circle
Lake Forest, CA 92630
9776 Whithorn Drive
Houston, TX 77095
UNITED KINGDOM
Heather Close
Lyme Green Business Park
Macclesfield, Cheshire
United Kingdom, SK11 0LR
IRELAND
Ballybrit Business Park
Galway, Republic of Ireland
SINGAPORE
No. 2 Kallang Pudding Rd.
#09-16 Mactech Building
Singapore 349307
MIDDLE EAST
LOB12, #G20
P.O. Box 61209
Jebel Ali, Dubai
United Arab Emirates
6.2 Other Sources of Help
Phone/Fax/Email
Toll-Free: +1-800-446-4872
Phone: +1-949-581-4464
Fax: +1-949-581-1151
Email: [email protected]
Phone: +1-281-855-6000
Fax: +1-281-855-3290
Email: [email protected]
Phone: +44-1625-619583
Fax: +44-1625-619098
Email: [email protected]
Phone: +353-91-751175
Fax: +353-91-751317
Email: [email protected]
Phone: +65-6-748-3488
Fax: +65-6-748-1911
Email: [email protected]
Phone: +971-4-8815751
Fax: +971-4-8817927
Email: [email protected]
General Monitors provides extensive documentation, white papers and product literature for its complete selection of safety products. A selection of these documents are available online at the General Monitors website at http://www.generalmonitors.com.
30
Model 2280A
7.0 Appendix
7.1 Warranty
General Monitors warrants the Model 2280A to be free from defects in workmanship or material under normal use and service within two years from the date of shipment.
General Monitors will repair or replace without charge any such equipment found to be defective during the warranty period. Full determination of the nature of, and responsibility for, defective or damaged equipment will be made by General Monitors’ personnel.
Defective or damaged equipment must be shipped to General Monitors’ plant or representative from which the original shipment was made. In all cases this warranty is limited to the cost of the equipment supplied by General Monitors. The customer will assume all liability for the misuse of this equipment by its employees or other personnel.
All warranties are contingent upon proper use in the application for which the product was intended and does not cover products which have been modified or repaired without General Monitors’ approval, or which have been subjected to neglect, accident, improper installation or application, or on which the original identification marks have been removed or altered.
Except for the express warranty stated above, General Monitors disclaims all warranties with regard to the products sold, including all implied warranties of merchantability and fitness and the express warranties stated herein are in lieu of all obligations or liabilities on the part of General Monitors for damages including, but not limited to, consequential damages arising out of, or in connection with, the performance of the product.
GMI’s sensor is a solid-state, continuous, diffusion type element. The sensor uses the ability of Hydrogen Sulfide to strongly and significantly adsorb onto certain materials as the basis for measurement. Specifically, H
2
S adsorbs onto many different metals (as well as many other materials, including numerous hydrocarbons, sulfur dioxide, and other sulfur compounds). GMI has developed a proprietary metal oxide semi-conductor, which is extremely selective in permitting H
2
S to adsorb onto it. That is, very few other compounds found in practical applications will affect this metal oxide. The semiconductor material is therefore specific to H
2
S.
The semiconductor is located in the system circuit, acting as a resistor. When air, which contains H
2
S, diffuses into the sensor through the outer flame arrestor, the adsorption of the H
2
S onto the semiconductor causes its electrical resistance to decrease. The sensor is temperature controlled to prevent adsorption rate variations from ambient temperature changes. The decrease in resistance is extremely repeatable over a range of 0-20, 0-50 or 0-100 ppm H
2
S. Therefore, the change produces a signal approximately proportional to the logarithm of the H
2
S concentration. This signal is processed, linearized, and displayed as a digital number on the front of the controller. The controller’s analog
31
Model 2280A
current output signal tracks the digital reading as well. The adsorption process is reversible so that when the air containing no H
2
S diffuses into the sensor, the H
2
S gas desorbs. The semiconductor then resumes its original “clean air” resistance value.
32
Model 2280A
7.3 General Specifications - Controller
Dimensions:
Weight:
Mounting:
4.0”W x 6.9”H x 11.5”D (102mm x 175mm x 292mm)
6.2 lbs. (2.86 kg)
Rack, panel, wall
Temperature Range: 32°F to 140°F (0°C to 60°C)
Storage Temperature: -4°F to +149°F (-20°C to 65°C)
Operating Humidity: 15% to 95% Non-Condensing
Alarm Circuits:
Output Signal:
205-255 VAC/50-60 Hz
22-30VDC. 9-Watts nominal per channel (117 VAC)
4 Amp relays @ 117 VAC, resistive
0-21.7 mA, 300-Ohm maximum load
Accuracy: ± 5%, 1.5-20mA
Digital Readout:
Accuracy:
Electrical
Classification:
0-20, 0-50 or 0-99 ppm
± 2 or ±10% of applied gas, whichever is greater
General purpose (non-hazardous, indoors)
Approvals: CSA
7.4 General Specifications - Sensor
Type:
Response Time:
Repeatability:
Specificity:
Electrical
Classification:
Continuous diffusion, adsorption type
T
50
< 1 minute with full-scale gas applied (screen)
T
50
< 2 minutes with full-scale gas applied (sintered)
±10% of reading or 2 ppm, whichever is greater
Hydrogen Sulfide specific
Class I, Division 1 and 2, Groups B, C and D
Temperature Range: -40° to +167° F (-40° to 75° C)
33
7.4.3 Recommended Spare Parts List
Qty
2
2
1
Description
Fuse, .8 amp, 250 VAC
Fuse, 3.15 amp, 250 VAC
Sensor
Part Number
951-012
951-213
Per Original Order
Table 10: Spare Parts List
Model 2280A
34
Model 2280A
7.5 Sample Calibration Schedule and Checklist
Sensor Serial Number Location
___________________ _____________________
1. Installation and Preliminary calibration. Date: __________________
Record date after preliminary calibration is done.
Date: __________________
2. 24-hour calibration. Record date after 24hour calibration is done.
3. 7-day calibration check. Record date and reading of calibration check. Repeat after 7 days if reading deviates more than ±20% or 2 ppm, whichever is greater. Otherwise go to step 4.
Date/Reading Date/Reading Date/Reading
____ ____ ____ ____ ____ ____
____ ____ ____ ____ ____ ____
____ ____ ____ ____ ____ ____
____ ____ ____ ____ ____ ____
4. 14-day calibration check. Record date and reading of calibration check. Repeat after 14 days if reading deviates more than ±20% or 2 ppm, whichever is greater. Otherwise go to step 5.
Date/Reading Date/Reading Date/Reading
____ ____ ____ ____ ____ ____
____ ____ ____ ____ ____ ____
____ ____ ____ ____ ____ ____
5. 30-day calibration check. Record date and reading of calibration check. Repeat after 30days if reading deviates more than ±20% or 2 ppm, whichever is greater. Otherwise go to step 6.
____ ____ ____ ____ ____ ____
Date/Reading Date/Reading Date/Reading
____ ____ ____ ____ ____ ____
____ ____ ____ ____ ____ ____
____ ____ ____ ____ ____ ____
____ ____ ____ ____ ____ ____
6. 60-day months calibration check. Record date and reading of calibration check. Repeat after 60 days if reading deviates more than
±20% or 2 ppm, whichever is greater.
Date/Reading Date/Reading Date/Reading
____ ____ ____ ____ ____ ____
____ ____ ____ ____ ____ ____
____ ____ ____ ____ ____ ____
____ ____ ____ ____ ____ ____
7. 90-day calibration check. Date/Reading Date/Reading Date/Reading
____ ____ ____ ____ ____ ____
____ ____ ____ ____ ____ ____
____ ____ ____ ____ ____ ____
____ ____ ____ ____ ____ ____
Table 11: Calibration Schedule
35
Model 2280A
7.6 Product Configuration Table
MODEL 2280A
FOUR CHANNEL H2S CONTROLLER
A B C D E F
A. CONTROLLER
2280A
1 (Std) -P1
2 -P2
Model 2280A Controller 6.2 lbs.
110 VAC/24VDC
220 VAC/24 VDC
B. RELAY ALARM
1
4
(STD) RA1
RA1
COMMON RELAY/COMMON ALARMS
DISCRETE RELAYS/DISCRETE ALARMS
C.
RELAY – STATE - NC
1
2
3
4
5
6
7
8
(STD) RS 1NC LATCH ALARM, NON-LATCH WARN, DE-ENERGIZED
RS 2NC LATCH ALARM, NON-LATCH WARN, ENERGIZED
RS 3NC LATCH ALARM, LATCH WARN, DE-ENERGIZED
RS 4NC LATCH ALARM, LATCH WARN, ENERGIZED
ENERGIZED
RS 6NC NON-LATCH ALARM, NON-LATCH WARN, ENERGIZED
RS 7NC NON-LATCH ALARM, LATCH WARN, DE-ENERGIZED
RS 8NC NON-LATCH ALARM, LATCH WARN, ENERGIZED
C. H2S – SENSOR
05
06
07
08
09
11
12
13
00
01
02
03
04
14
15
16.
NONE
(STD) 50445-1
50445-5
50445-9
50448-1
50448-5
50448-9
50454-1
50454-5
50454-9
51457-1
51457-1L
51457-5
51457-5L
51457-9
51457-9L
No Sensor
Sensor Al 0 to 100 PPM H2S
Sensor Al 0 to 50 PPM H2S
Sensor Al 0 to 20 PPM H2S
Sensor SS 0 to 100 PPM H2S
0.5 Lbs.
0.5 Lbs.
0.5 Lbs.
0.5 Lbs.
0.5 Lbs.
Sensor SS 0 to 50 PPM H2S
Sensor SS 0 to 20 PPM H2S
Sensor PTB AL 0 to 100 PPM H2S
Sensor PTB AL 0 to 50 PPM H2S
0.5 Lbs.
0.5 Lbs.
0.5 Lbs.
0.5 Lbs.
Sensor PTB AL 0 to 20 PPM H2S 0.5 Lbs.
Sensor SS Atex H2S 0-100 (Replaces 50457-1) 0.0 Lbs.
Sensor SS Atex H2S 0-100 (W/Lugs) 0.5 Lbs.
Sensor SS Atex H2S 0-50 (Replaces 50457-5) 0.5 Lbs
Sensor SS Atex H2S 0-50 (W/Lugs) 0.5 Lbs.
Sensor SS Atex H2S 0-20 (Replaces 50457-9) 0.5 Lbs.
Sensor SS Atex H2S 0-20 (W/Lugs) 0.5 Lbs.
36
Model 2280A
4
0
1
D. H2S METER SCALE:
1
2
3
(STD) H2S1
H2S2
H2S3
E. ACTIVE CHANNELS:
99 PPM SCALE
50 PPM SCALE
20 PPM SCALE
Controller Only
One Active Channel 6.2 Lbs.
1X Cal Kit Refill 4 Ea #20/#50/#1 0.7 Lbs.
3X H2S sensor simulator w/o SW 0.5 Lbs.
1X Sensor Housing
1X Calibration Bottle
3.0 Lbs.
1.0 Lbs.
Two Active Channels 9.4 Lbs.
2X Cal Kit Refill 4 Ea #20/#50/#1 0.7 Lbs.
2X H2S sensor simulator w/o SW 0.5 Lbs.
2X Sensor Housing 3.0 Lbs.
2X Calibration Bottle
Three Active Channels
1.0 Lbs.
12.6 Lbs.
3X Cal Kit Refill 4 Ea #20/#50/#1 0.7 Lbs.
1X H2S sensor simulator w/o SW 0.5 Lbs.
3X Sensor Housing
1X Calibration Bottle
3.0 Lbs.
1.0 Lbs.
(STD) Four Active Channels
4X Cal Kit Refill 4 Ea #20/#50/#1
15.8 Lbs.
0.7 Lbs.
4X Sensor Housing
1X Calibration Bottle
3.0 Lbs
1.0 Lbs.
37
\\
7.6.1 Panel Assembly, Panel Mount – 98, Ref: 10199C
Model 2280A
Figure 9: Panel Assembly, Panel Mount – 98, Ref: 10199C
38
Model 2280A
7.6.2 Interconnection Drawing Zone Control Model 2280A Controller
Figure 10: Interconnection Drawing Zone Control Model 2280A Controller
39
Model 2280A
ADDENDUM
Product Disposal Considerations
This product may contain hazardous and/or toxic substances.
EU Member states shall dispose according to WEEE regulations. For further General Monitors’ product WEEE disposal information please visit:
www.generalmonitors.com/customer_support/faq_general.html
All other countries or states: please dispose of in accordance with existing federal, state and local environmental control regulations.
40
Model 2280A
alarm relays, 13 ampoules, 19 analog output, 18 auto-calibration, 3 battery backup, 7 breaker bottles, 19 cable length, 11 calibration check, 21 calibration intervals, 27 calibration preparation instructions, 19 calibration prompts, 17 common relay, 4
Controller, 33
Controller Operating Temperature
Range, 6 damaged equipment, 31 de-energized, 23 desiccant, 10 digital display, 17 entering the password, 23 explosion-proof integrity, 1 fault codes, 29 fault condition, 19 fault diagnostic codes, 17 four channel system, 3 frequency of calibration, 26 gas concentrations, 17 high set point, 24
Inductive loads, 14 introduction, 1 latching/non-latching, 18 low set point, 24 mode button, 17
Index
Mounting, 6 password enabled/disabled option, 23
Periodic Calibration Checks, 27 polycarbonate inlay, 3 portable purge calibrator, 19 recommended spare parts list, 34 replacing a sensor, 26 reset button, 17
RFI resistant, 6 screen parts, 1 semi-conductor, 31
Sensor Assemblies, 5 sensor failure, 28 sensor housing, 1
Sensor Specifications, 33 service-loop, 5 setup parameters, 17 shielded cable, 11 sintered parts, 1
Spare Sensors, 28 splash-guard, 11 standard sensor assembly, 9 status indicators, 17 system circuit, 31 system verification, 27 temperature range limitations, 8 terminal connector, 10 test gas applicator, 11
Troubleshooting Table, 28 user interfaces, 17
Warning, 1 warranty, 31
Warranty, 33
41
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Key features
- Four-channel independent sensor monitoring
- Auto-calibration capabilities
- Individual alarm and fault relays for each channel
- LED indicators for status and mode
- Analog output for signal transmission
- Battery backup option available
- Remote reset capability
