ACUTEC™ 35 GAS DETECTION SYSTEM

ACUTEC™ 35 GAS DETECTION SYSTEM
ACUTEC™ 35
GAS DETECTION
SYSTEM
BOOK NO. WT.050.130.000.UA.IM.1108
ACUTEC™ 35 SYSTEM
EQUIPMENT SERIAL NO. _____________________________
DATE OF START-UP ________________________________
START-UP BY ____________________________________
Prompt service available from nationwide authorized service contractors.
ORDERING INFORMATION
In order for us to fill your order immediately and correctly, please order material by description and part number, as shown
in this book. Also, please specify the serial number of the equipment on which the parts will be installed.
WARRANTY
Seller warrants for a period of one year after shipment that the equipment or material of its manufacture is free from defects
in workmanship and materials. Corrosion or other decomposition by chemical action is specifically excluded as a defect
covered hereunder, except this exclusion shall not apply to chlorination equipment. Seller does not warrant (a) damage
caused by use of the items for purposes other than those for which they were designed, (b) damage caused by unauthorized
attachments or modifications, (c) products subject to any abuse, misuse, negligence or accident, (d) products where parts
not made, supplied, or approved by Seller are used and in the sole judgement of the Seller such use affects the products’
performance, stability or reliability, and (e) products that have been altered or repaired in a manner in which, in the sole
judgement of Seller, affects the products’ performance, stability or reliability. SELLER MAKES NO OTHER WARRANTY OF
ANY KIND, AND THE FOREGOING WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING ANY WARRANTY OF MERCHANTABILITY OR OF FITNESS OF THE MATERIAL OR EQUIPMENT FOR
ANY PARTICULAR PURPOSE EVEN IF THAT PURPOSE IS KNOWN TO SELLER. If Buyer discovers a defect in material or workmanship, it must promptly notify Seller in writing; Seller reserves the right to require the return of such defective
parts to Seller, transportation charges prepaid, to verify such defect before this warranty is applicable. In no event shall
such notification be received by Seller later than 13 months after the date of shipment. No action for breach of warranty
shall be brought more than 15 months after the date of shipment of the equipment or material.
LIMITATION OF BUYER’S REMEDIES. The EXCLUSIVE REMEDY for any breach of warranty is the replacement f.o.b.
shipping point of the defective part or parts of the material or equipment. Any equipment or material repaired or replaced
under warranty shall carry the balance of the original warranty period, or a minimum of three months. Seller shall not be
liable for any liquidated, special, incidental or consequential damages, including without limitation, loss of profits, loss of
savings or revenue, loss of use of the material or equipment or any associated material or equipment, the cost of substitute
material or equipment, claims of third parties, damage to property, or goodwill, whether based upon breach of warranty,
breach of contract, negligence, strict tort, or any other legal theory; provided, however, that such limitation shall not apply
to claims for personal injury.
Statements and instructions set forth herein are based upon the best information and practices known to Siemens Water
Technologies Corp., but it should not be assumed that every acceptable safety procedure is contained herein. Of necessity
this company cannot guarantee that actions in accordance with such statements and instructions will result in the complete
elimination of hazards and it assumes no liability for accidents that may occur.
s
Water Technologies
1901 West Garden Road, Vineland, NJ 08360
WT.050.130.000.UA.IM.1108
1.010-42
ACUTEC™ 35 SYSTEM
INTRODUCTION
The Siemens Water Technologies Series 50-130 Acutec™ 35 Gas Detection system is an on-line monitoring system for the detection of chlorine
(Cl2), sulfur dioxide (SO2), or ammonia (NH3) gas in ambient air. Alarm
contacts are provided to transfer at user selectable setpoints. Monitor
modules provide a digital readout of gas level and a 4-20 mA output.
Single or Dual Units are available, using any combination of gas detectors and monitors or alarm units.
One Receiver Module is connected to each gas Sensor/Transmitter with a
two-conductor cable, and provides information on the gas concentration
in the sensor area. Receivers are powered by the Power Supply Module
supplied with the Gas Detector system.
The Series 50-130 Sensor/Transmitter consists of an electrochemical gas
sensor and an electronic amplifier that transmits a gas concentration
signal to a Receiver Module located in the Control Unit. An optional gas
generator may be ordered which enables the Receiver to automatically
test the sensor every 24 hours.
NOTE: When ordering material always specify model and serial number of apparatus.
Table Of Contents
Very Important Safety Precautions .......................... SP-1,-2
Regional Offices ..................................................... 1.010-1
Technical Data ........................................................ Section 1
Installation ............................................................. Section 2
Operation ............................................................... Section 3
Service ................................................................... Section 4
Parts Illustrations .................................................... Section 5
Spare Parts List ....................................................... Section 6
WT.050.130.000.UA.IM.1108
Introd.
ACUTEC™ 35 SYSTEM
VERY IMPORTANT SAFETY PRECAUTIONS
This page titled “Very Important Safety Precautions” provides, in brief, information of urgent importance
relative to safety in the installation, operation, and maintenance of this equipment.
WARNING
TO AVOID POSSIBLE SEVERE PERSONAL INJURY AND EQUIPMENT DAMAGE, OBSERVE THE FOLLOWING
PRECAUTIONS:
GASES DETECTED ARE HAZARDOUS SUBSTANCES, AND IF BREATHED IN HIGH CONCENTRATIONS CAN
CAUSE DEATH. THE OPERATION OF THIS DETECTOR MUST BE CHECKED AND VERIFIED FREQUENTLY ON
A REGULAR SCHEDULE.
TO AVOID INJURY FROM ELECTRICAL SHOCK, TURN POWER SOURCES OFF BEFORE SERVICING EQUIPMENT.
TO AVOID POSSIBLE SEVERE PERSONAL INJURY OR DAMAGE TO EQUIPMENT, THIS PRODUCT SHOULD
ONLY BE USED WITH POWER SUPPLIES THAT HAVE A SINGLE HOT WIRE WITH RESPECT TO EARTH. THE
WIRE CONNECTED TO POWER SUPPLY TERMINAL “N” MUST BE NEUTRAL. POWER AND EARTH GROUND
MUST BE PROPERLY CONNECTED AS SHOWN.
THE GENERAL SENSOR RESPONSE TEST, AS DESCRIBED IN THIS MANUAL, MUST BE PERFORMED WHENEVER A NEW SENSOR IS INSTALLED.
AFTER ANY MAINTENANCE THE DETECTOR SHOULD BE TESTED FOR RESPONSE TO ASSURE NORMAL
OPERATION.
REPLACE SENSOR IMMEDIATELY IF SENSOR FAILS GAS TEST.
HANDLE BATTERIES WITH CARE, BEING CERTAIN NOT TO SHORT TERMINALS, AS SEVERE ARCING OR
EXPLOSION COULD OCCUR.
TO ENSURE PROPER AND SAFE OPERATION OF THIS EQUIPMENT, USE ONLY SIEMENS WATER TECHNOLOGIES LISTED PARTS EXCEPT COMMERCIALLY AVAILABLE PARTS AS IDENTIFIED BY COMPLETE
DESCRIPTION ON PARTS LIST. THE USE OF UNLISTED PARTS CAN RESULT IN EQUIPMENT MALFUNCTIONS CAUSING POSSIBLE SEVERE PERSONAL INJURY.
THIS EQUIPMENT SHOULD BE INSTALLED, OPERATED AND SERVICED ONLY BY TRAINED, QUALIFIED
PERSONNEL WHO ARE THOROUGHLY FAMILIAR WITH THE ENTIRE CONTENTS OF THIS INSTRUCTION
BOOK.
WT.050.130.000.UA.IM.1108
SP-1
ACUTEC™ 35 SYSTEM
VERY IMPORTANT SAFETY PRECAUTIONS (CONT’D)
DO NOT DISCARD THIS INSTRUCTION BOOK UPON COMPLETION OF INSTALLATION. INFORMATION
PROVIDED IS ESSENTIAL TO PROPER AND SAFE OPERATION AND MAINTENANCE.
ADDITIONAL OR REPLACEMENT COPIES OF THIS INSTRUCTION BOOK ARE AVAILABLE FROM:
Siemens Water Technologies Corp.
1901 West Garden Road
Vineland, New Jersey 08360
Phone: (856) 507-9000
Fax: (856) 507-4125
NOTE
Minor part number changes may be incorporated into Siemens Water Technologies products from time
to time that are not immediately reflected in the instruction book. If such a change apparently has been
made in your equipment and does not appear to be reflected in your instruction book, contact your
local Siemens Water Technologies sales office for information.
Please include the equipment serial number in all correspondence. It is essential for effective communication and proper equipment identification.
WT.050.130.000.UA.IM.1108
SP-2
ACUTEC™ 35 SYSTEM
REGIONAL OFFICES
INSTALLATION, OPERATION, MAINTENANCE, AND SERVICE INFORMATION
Direct any questions concerning this equipment that are not answered in the instruction book to the
Reseller from whom the equipment was purchased. If the equipment was purchased directly from
Siemens Water Technologies Corp., Vineland, NJ, contact the office indicated below.
UNITED STATES
1901 West Garden Road
Vineland, NJ 08360
TEL: (856) 507-9000
FAX: (856) 507-4125
CANADA
If the equipment was purchased directly from Siemens Water Technologies Canada, Inc., contact the
nearest office indicated below.
WT.050.130.000.UA.IM.1108
ONTARIO
QUEBEC
250 Royal Crest Court
Markham, Ontario
L3R3S1
(905) 944-2800
243 Blvd. Brien
Bureau 210
Repentigny, Quebec
(450) 582-4266
1.010-1
ACUTEC™ 35 SYSTEM
SECTION 1 – TECHNICAL DATA
List Of Contents
PARA./DWG. NO.
Technical Data ........................................................ 1.1
Interferences .......................................................... 1.2
WT.050.130.000.UA.IM.1108
1
ACUTEC™ 35 SYSTEM
1.1
Technical Data
Gas Ranges
Standard
Minimum
Maximum
Gas
Range
Range
Range
Chlorine
0 - 10 ppm
0 - 5 ppm
0 - 50 ppm
Sulfur Dioxide
0 - 20 ppm
0 - 10 ppm
0 - 100 ppm
Ammonia
0 - 100 ppm
0 - 50 ppm
0 - 500 ppm
Gas sensors are shipped factory set to standard ranges, but may be
calibrated to other ranges as shown.
Setpoints
Adjustable, 5 - 100% of Range
Enclosure Ratings
NEMA 4X (except battery enclosure)
Distance, Transmitter to Receiver
1000 ft. (maximum)
Operating Temperature
0 to 105 °F, continuous
-10 to 120 °C, intermittent
Humidity
0 - 99%, non-condensing
Power
85 - 255 VAC, 50/60 Hz, 15 W
Contacts
Alarm (configurable): 3 SPDT
Trouble: 1 SPDT
Power Failure: 1 SPDT
Contact Rating
10 A at 120 VAC, 5 A at 250 VAC,
Resistive
Battery Back-up (optional)
12 V, 4 A/hr, 6 Hrs minimum
Analog Output (optional)
4-20 mA, Isolated, 1000 ohms
maximum
Sensor Life
2 years (maximum)
Gas Generator Life
1 year
NOTE: The Auto-Test option is for indoor use only, and should only
be used with detectors set to the standard range or lower, as shown
in the GAS RANGES table. If used with higher ranges, the generator
may not produce enough gas to test the sensor.
WT.050.130.000.UA.IM.1108
2
ACUTEC™ 35 SYSTEM
1.2
Interferences
Electrochemical sensors are, by nature, not 100% selective; therefore,
they can exhibit response to other gases present in ambient air.
The following tables list the possible interferences that may occur when
using the different gas sensors. The tables indicate the relative response
of the sensor to 1 ppm of the listed gas, expressed in terms of relative
ppm signal. For example: exposure of a chlorine sensor to a gas sample
containing 1 ppm of nitrogen dioxide (NO2) would produce a signal equal
to 0.4 ppm of chlorine. A negative sign (-) indicates an interference that
can cause low gas measurements if there is a mixture of the measured
gas and another gas.
CHLORINE
Interference Gas
Bromine
Fluorine
Chlorine Dioxide
Ozone
Nitrogen Dioxide
Hydrogen Sulfide
Hydrogen Cyanide
Methyl Mercaptan
Sulfur Dioxide
Response
1.0
1.0
1.0
1.0
0.4
-0.1
-0.05
-0.04
-0.01
SULFUR DIOXIDE
Interference Gas
Nitrogen Dioxide
Hydrogen Cyanide
Nitric Oxide
Acetylene
Ethanol
Hydrogen
Bromine
Fluorine
Chlorine Dioxide
Ozone
WT.050.130.000.UA.IM.1108
Response
0.8
0.15
0.04
0.02
0.05
0.005
-0.1
-0.1
-0.1
-0.1
3
ACUTEC™ 35 SYSTEM
AMMONIA
Interference Gas
Methyl Mercaptan
Hydrogen Sulfide
Hydrogen
Nitrogen Dioxide
Chlorine
WT.050.130.000.UA.IM.1108
Response
7
2
0.1
-0.2
-0.2
4
ACUTEC™ 35 SYSTEM
SECTION 2 – INSTALLATION
List Of Contents
PARA./DWG. NO.
Overview ................................................................ 2.1
General Installation ................................................ 2.2
Mounting Power Supply and Receiver Modules ........ 2.3
Electrical Connections............................................. 2.4
Installation of Power Supply Module ....................... 2.5
Illustrations
Dimensions
Single Point Detection System .............................. 50.130.100.001
Dual Point Detection System ................................ 50.130.100.002
Sensor/Transmitter ............................................... 50.130.100.003
Battery Back-up.................................................... 50.130.100.004
Installation Wiring
Single Point Detection System ........................... 50.130.130.001
Dual Point Detection System ............................. 50.130.130.002
WT.050.130.000.UA.IM.1108
5
ACUTEC™ 35 SYSTEM
2.1
Overview
The Series 50-130 Gas Detection System consists of modular components that can be used in a variety of configurations to fit specific
application requirements. Following is a brief description of the
major system components. More detailed information follows later
in this manual.
•
BASE UNIT: Includes a Power Supply Module housed in a NEMA 4X
enclosure. Single-Point Units accepts one Receiver Module, and DualPoint Units accept two Receiver Modules. All units are provided with
an audible horn.
•
POWER SUPPLY MODULE: Provides power for one or two Receiver
Modules, for the audible horn, and for charging an external Battery
Back-up. The power supply accepts 85 to 255 volts, ac (50/60 Hz)
and mounts on a DIN rail.
•
DETECTOR RECEIVER MODULE: Receives a signal from a one Sensor/
Transmitter, can be set for two alarm levels and provides three alarm
contacts. The Receiver Module mounts on a standard DIN rail. Receiver Modules include a Reset/Acknowledge button, provide power
for Sensor/Transmitters, and control Autotest Generators.
•
MONITOR RECEIVER MODULE: Same as the Detector Module, but also
includes a digital display of gas level and a 4-20 mA output.
•
SENSOR/TRANSMITTER: Consists of an electrochemical gas sensor connected to a NEMA 4X transmitter, which sends a signal to a Receiver
Module.
•
AUTOTEST GENERATOR: An electrochemical gas generator which
attaches to Sensor/Transmitters and automatically tests sensor
response daily.
NOTE: The Auto-Test option is for indoor use only, and should only
be used with detectors set to the standard range or lower, as shown
in Section 1.1 – Technical Data. If used with higher ranges, the generator may not produce enough gas to test the sensor.
•
WT.050.130.000.UA.IM.1108
BATTERY BACK-UP: The Battery Back-up option for gas detection systems consists of a separate wall-mounted enclosure which houses a
battery and a control circuit board. The battery is a sealed, lead-acid
type and is rated four ampere-hours.
6
ACUTEC™ 35 SYSTEM
2.2
General Installation
NOTE: Power supply or Receiver modules may be shipped with protective transparent plastic covers. These covers should be peeled
off and discarded.
System enclosures, Battery Back-up units, and Sensor/Transmitters are
all designed for surface mounting using screws or bolts inserted through
the recessed mounting holes at each corner of the enclosures. Mounting
hole dimensions are shown on the appropriate diagram. Included with
each system enclosure are mounting hole templates which can be used
to mark hole centers on walls or mounting panels. Mounting recesses
are suitable for #8 machine screws or wood screws.
Refer to paragraph 3.4.1, Sensor Installation, for specific information on
locating gas sensors.
Enclosures are supplied with conduit hubs and seal rings for water-tight
connection of 1/2” NPT threaded conduit. Plastic cable glands may also
be purchased to connect cables without conduit.
Install the 1/2” conduit hubs in any enclosure knockout labeled PG16.
Note that some knockouts have more than one designation, such as
PG11/16. Those with two designations will have concentric circles
for knockouts. The inner circle marks the lower PG number while the
outer circle marks the higher number. Place a thin bladed screwdriver
into the circular slot or the desired knockout size and tap firmly with a
hammer (see Figure 2.1). Place the seal over the hub threads on the
outside of the enclosure and attach the hub with the supplied nut.
Figure 2.1
The Acutec™ unit should not be exposed to direct sunlight. Continuous
ambient temperature should not exceed 105 °F. When this temperature
is likely to be approached, it is recommended that relays be used in the
non-energized mode, and the display be set to normal intensity (Monitor
Units only). See Section 3 for details.
WT.050.130.000.UA.IM.1108
7
ACUTEC™ 35 SYSTEM
2.3
Mounting Power Supply and Receiver Modules (See Dwg. 50.130.000.001)
Power Supply and Receiver Modules are mounted to a standard 35 x 7.5
mm DIN rail in the detection system enclosure. The spring loaded clip
with the loop holds the module to the rail. To install modules, first slide
the bottom of the module under the rail. Then pull the loop out with a
small screwdriver while lowering the top of the module onto the rail. To
remove modules, reverse this procedure.
2.4
Electrical Connections (See Dwgs. 50.130.130.001 And 50.130.130.002)
Field wiring required for the Detection System includes connection of
ac power, connection of two-conductor cable between the Receiver and
the Sensor/Transmitter, connection of the Battery Back-up unit (when
purchased), and connection of the audible horn to Receiver Modules. A
25-foot length of two-conductor cable is supplied for each Sensor/Transmitter. Longer lengths of up to 1000 feet may be used when required.
The ac input power is connected to the lower left of the Power Module,
as shown in the Installation Wiring drawings. A ground terminal is provided on the mounting track for connection of earth ground. For safe
operation and to avoid noise interference, it is important that earth
ground be connected to this terminal first, and then to the power input
earth ground terminal on the Power Supply Module, as shown.
!
WARNING: TO AVOID POSSIBLE SEVERE PERSONAL INJURY OR DAMAGE TO EQUIPMENT, THIS PRODUCT SHOULD ONLY BE USED WITH
POWER SUPPLIES THAT HAVE A SINGLE HOT WIRE WITH RESPECT TO
EARTH. THE WIRE CONNECTED TO POWER SUPPLY TERMINAL “N”
MUST BE NEUTRAL. POWER AND EARTH GROUND MUST BE PROPERLY
CONNECTED AS SHOWN.
NOTE: Field wiring must conform to local electrical codes.
The wiring drawings show internal wiring of the systems. Sensor/Transmitter connections are shown in paragraph 3.4.1, Sensor Installation.
All terminal blocks are plug-in type, and can be unplugged allowing replacement of modules without removing individual wires.
Electrical connection is made between the Battery Back-up unit and
the Power Supply Module. The circuit board mounted on the battery
contains a two-position plug-in terminal block marked plus and minus.
The plus terminal is connected to terminal B+ of the power supply and
the minus terminal is connected to B- of the power supply.
WT.050.130.000.UA.IM.1108
8
ACUTEC™ 35 SYSTEM
2.5
Installation of Power Supply Module
The Power Supply Module used in the gas detection system operates
on ac supplies of 85 volts to 255 volts, at 50/60 Hz. No adjustments or
modifications are required of the user.
WT.050.130.000.UA.IM.1108
9
ACUTEC™ 35 SYSTEM
4-5/16”
(110)
7-3/16”
(183)
6-9/16”
(167)
s
7-1/16”
(179)
6-1/2”
(165)
NOTE: ( ) INDICATES DIMENSIONS IN MILLIMETERS.
SINGLE POINT DETECTION SYSTEM - DIMENSIONS
50.130.100.001
ISSUE 3 8-08
WT.050.130.000.UA.IM.1108
10
ACUTEC™ 35 SYSTEM
4-3/8”
(111)
10”
(254)
9-7/16”
(240)
s
7-1/16”
(179)
6-1/2”
(165)
NOTE: ( ) INDICATES DIMENSIONS IN MILLIMETERS.
DUAL POINT DETECTION SYSTEM - DIMENSIONS
50.130.100.002
ISSUE 3 8-08
WT.050.130.000.UA.IM.1108
11
ACUTEC™ 35 SYSTEM
1-1/8”
(29)
1-1/16”
(27)
3-3/4”
(95)
3-1/8”
(79)
3-1/8”
(79)
2-5/8”
(67)
3-3/4”
(95)
2-1/4”
(57)
1-3/8”
(35)
3/4”
(19)
NOTE: ( ) INDICATES DIMENSIONS IN MILLIMETERS.
A
ACCESSORY ITEM FURNISHED ONLY IF SPECIFICALLY LISTED IN QUOTATION.
WHEN THE GAS GENERATOR IS USED, THE UNIT MUST BE MOUNTED AS SHOWN.
SENSOR/TRANSMITTER - DIMENSIONS
With Generator
50.130.100.003
ISSUE 2 7-98
WT.050.130.000.UA.IM.1108
12
ACUTEC™ 35 SYSTEM
3-1/2”
(89)
4-3/8”
(111)
3-3/4”
(95)
7-1/8”
(181)
6-1/2”
(165)
NOTE: ( ) INDICATES DIMENSIONS IN MILLIMETERS.
BATTERY BACK-UP - DIMENSIONS
50.130.100.004
ISSUE 2 7-98
WT.050.130.000.UA.IM.1108
13
ACUTEC™ 35 SYSTEM
NOTE: S WIRING BY SIEMENS WATER TECHNOLOGIES.
FIELD WIRING MUST CONFIRM TO LOCAL ELECTRICAL CODES.
SINGLE POINT DETECTION SYSTEM - INSTALLATION WIRING
50.130.130.001
ISSUE 2
WT.050.130.000.UA.IM.1108
14
11-08
ACUTEC™ 35 SYSTEM
NOTE: S WIRING BY SIEMENS WATER TECHNOLOGIES.
FIELD WIRING MUST CONFIRM TO LOCAL ELECTRICAL CODES.
DUAL POINT DETECTION SYSTEM - INSTALLATION WIRING
50.130.130.002
ISSUE 2
WT.050.130.000.UA.IM.1108
15
11-08
ACUTEC™ 35 SYSTEM
WT.050.130.000.UA.IM.1108
16
ACUTEC™ 35 SYSTEM
SECTION 3 – OPERATION
List Of Contents
PARA./DWG. NO.
Power Supply Operation ......................................... 3.1
Receiver Module Operation ..................................... 3.2
Configuration Switches ........................................ 3.2.1
Range Selection ................................................... 3.2.2
Setpoint Selection ................................................ 3.2.3
Relay Configuration ............................................. 3.2.4
Alarm Delay ......................................................... 3.2.5
Display Intensity .................................................. 3.2.6
Auto-Test Enable .................................................. 3.2.7
Receiver Module Startup ......................................... 3.3
Alarm Acknowledge and Reset ............................. 3.3.1
Sensor Trouble Alarm and Relays .......................... 3.3.2
Auto-Test Function ............................................... 3.3.3
Lamp and Horn Test ............................................. 3.3.4
Relay Inhibit......................................................... 3.3.5
Manual Auto-Test ................................................. 3.3.6
Remote Reset ....................................................... 3.3.7
Analog Output ..................................................... 3.3.8
Sensor Transmitter Operation ................................. 3.4
Sensor Installation ............................................... 3.4.1
Sensor Location (Chlorine, Sulfur Dioxide,
and Ammonia) .................................................. 3.4.2
Battery Back-Up Operation ...................................... 3.5
Illustrations
Assembly – Gas Detector System .......................... 50.130.160.001
WT.050.130.000.UA.IM.1108
17
ACUTEC™ 35 SYSTEM
3.1
Power Supply Operation (See Dwg. 50.130.000.001)
The power supply provides a regulated 13.7 Vdc to Receiver Modules and
to the Battery Back-up through three sets of terminals at the top of the
module. Total output current is rated at one amp.
The power supply provides a SPDT relay contact which de-energizes when
ac power is lost.
3.2
Receiver Module Operation
Receiver Modules provide the following features:
•
•
•
•
•
•
•
•
LED power on indicator with gas symbol designation.
LED indicator lamps for WARNING and ALARM.
Three SPDT alarm relays, switch programmable to operate on Warning or Alarm level, for latching or non-latching operation, and to be
maintained normally energized or normally de-energized. In addition,
Alarm Relay 3 may be configured to control an external horn.
LED indicator lamp for SENSOR TROUBLE condition.
One SPDT Trouble Relay, for remotely indicating a SENSOR TROUBLE
condition.
Isolated remote reset input terminals for remote alarm acknowledgement.
Supplies power for operation of a Sensor/Transmitter up to 1000
feet away.
Controls the Autotest Gas Generator.
In addition, Monitor type Receivers provide the following functions:
•
•
3.2.1
LED digital display of gas concentration in ppm.
Isolated 4-20 mA output signal proportional to gas concentration.
Configuration Switches
Receivers for different gases are identical except for the gas symbol attached to the green power LED. Operating range, setpoints, relay configuration, display intensity, alarm delay, and Auto-Test activation are
selectable using four banks of DIP switches located on the configuration
circuit board inside the Receiver module.
The configuration switches can be adjusted as follows:
!
CAUTION: To protect internal components from possible damage,
this procedure should be performed in a static free environment.
a. Remove all power from the gas detector unit.
WT.050.130.000.UA.IM.1108
18
ACUTEC™ 35 SYSTEM
b. Unplug the terminal connectors on the top and bottom of the receiver
module. Refer to Figure 3.1.
c. Remove the receiver module from the enclosure by pulling out the
plastic clip at the top of the module while removing the module from
the rail in the back of the enclosure.
d. Turn the receiver module over. There are four plastic tabs on the back
side of the unit. Gently spread the plastic tabs out and lift the back
panel off the receiver, being careful not to break the tabs.
e. Gently push up on the terminal connectors. This will allow the electronic assembly to be lifted out of the housing.
Figure 3.1 - Front and Back Views of Receiver Module
WT.050.130.000.UA.IM.1108
19
ACUTEC™ 35 SYSTEM
f.
Position the electronic assembly as shown in Figure 3.2. Identify
DIP SWITCH BANKS A through D.
Figure 3.2 - Top View of Module Electronics Without Housing
g. Adjust the Receiver DIP switch functions as needed, by referring to
the Figure 3.3.
Switches can be set using the tip of a ball point pen or other tool with
a small point on one end. Switches are two-position, up indicating
“on” or a value of “1” and down indicating “off” or a value of “0”.
h. After adjusting the DIP switches, reassemble the receiver by repeating steps a through e in the reverse order, while observing the
following:
(1) When returning the electronic assembly to the housing, the LEDs
and displays must line up with the module enclosure windows.
(2) The bottom panel must be installed with the plastic clip at the
top of the receiver module.
WT.050.130.000.UA.IM.1108
20
ACUTEC™ 35 SYSTEM
BANK A
ACTIVATE
ALARMS
WARNING SETPOINT - % OF RANGE
ON
BELOW
SETPOINT
1
1
1
1
1
1
1
ABOVE
SETPOINT
0
0
0
0
0
0
0
1
2
3
4
5
6
7
8
BANK B
ALARM
DELAY
ALARM SETPOINT - % OF RANGE
ON
10
SECONDS
1
1
1
1
1
1
1
2
SECONDS
0
0
0
0
0
0
0
1
2
3
4
5
6
7
8
LATCHING
NORMAL
ENERG.
BANK C
DISPLAY RANGE
RELAY 3
ON
1
1
1
1
HORN
ALARM
0
0
0
0
ALARM
OR
WARNING
WARNING
1
2
3
4
5
6
AUTO
TEST
DISPLAY
INTENSITY
ON
HIGH
ALARM
OFF
NORMAL
WARNING
1
2
3
NONNORMAL
LATCHING DE-ENERG.
7
8
BANK D
RELAY 1
RELAY 2
ON
LATCHING
NORMAL
ENERG.
ALARM
NORMAL
ENERG.
NONNORMAL
NORMAL
NONWARNING
LATCHING DE-ENERG.
LATCHING DE-ENERG.
4
5
6
] Shows Factory Settings
Figure 3.3 - Receiver Dip Switch Functions
WT.050.130.000.UA.IM.1108
LATCHING
21
7
8
ACUTEC™ 35 SYSTEM
3.2.2
Range Selection
Receivers are factory configured for the Standard Operating Range and
Setpoints as listed below.
Factory Settings of Range and Setpoints
Standard
Warning
Gas
Range
Setpoint
Chlorine
0 - 10 ppm
1 ppm
Sulfur Dioxide
0 - 20 ppm
2 ppm
Ammonia
0 - 100 ppm
25 ppm
Alarm
Setpoint
3 ppm
5 ppm
35 ppm
Display range selection is made using binary numbers to represent the
full scale operating range for the receiver. The RANGE SELECTION table,
below, provides the proper switch settings for the ranges available on each
receiver. Range selection is made using switches C1 to C4. The 4-20mA
output signal is proportional to the selected range.
Range Selection
Display Range
0 - 1.00
0 - 2.00
0 - 3.00
0 - 4.0
0 - 5.0
0 - 10.0
0 - 20.0
0 - 25.0
0 - 50
0 - 100
0 - 200
0 - 500
3.2.3
Switch Settings
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
Setpoint Selection
The Warning and Alarm setpoints are factory configured to the values
shown in FACTORY SETTINGS OF RANGE AND SETPOINTS table, above,
and can be changed by using the configuration switches identified
in the DIP SWITCH FUNCTIONS chart. The Warning setpoint is set using switches A2 to A8 and the Alarm setpoint is set using switches
B2 to B8. A binary number is used to select setpoints as a percent of
operating range.
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ACUTEC™ 35 SYSTEM
For instance, if you have a receiver range of 0 to 10 ppm and want to
adjust a setpoint for 3 ppm, set the appropriate DIP switches to the binary
number for 30% from the SETPOINT SELECTION table, below.
%
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
WT.050.130.000.UA.IM.1108
Switch Pos.
0000101
0000110
0000111
0001000
0001001
0001010
0001011
0001100
0001101
0001110
0001111
0010000
0010001
0010010
0010011
0010100
0010101
0010110
0010111
0011000
0011001
0011010
0011011
0011100
0011101
0011110
0011111
0100000
0100001
0100010
0100011
0100100
23
Setpoint Selection
%
Switch Pos.
37
0100101
38
0100110
39
0100111
40
0101000
41
0101001
42
0101010
43
0101011
44
0101100
45
0101101
46
0101110
47
0101111
48
0110000
49
0110001
50
0110010
51
0110011
52
0110100
53
0110101
54
0110110
55
0110111
56
0111000
57
0111001
58
0111010
59
0111011
60
0111100
61
0111101
62
0111110
63
0111111
64
1000000
65
1000001
66
1000010
67
1000011
68
1000100
%
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
Switch Pos.
1000101
1000110
1000111
1001000
1001001
1001010
1001011
1001100
1001101
1001110
1001111
1010000
1010001
1010010
1010011
1010100
1010101
1010110
1010111
1011000
1011001
1011010
1011011
1011100
1011101
1011110
1011111
1100000
1100001
1100010
1100011
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ACUTEC™ 35 SYSTEM
The Gas Detector is factory set to alarm when gas concentrations above
the chosen setpoints are exceeded; however, if switch A1 is set to the
ON position, alarms will be initiated when gas concentration is below
the setpoint.
3.2.4
Relay Configuration
•
FACTORY CONFIGURATION OF RELAYS —
*
*
*
*
WT.050.130.000.UA.IM.1108
Relay 1 – Configured to trip above the Warning setpoint and set
for normally energized, non-latching operation.
Relay 2 – Configured to trip above the Alarm setpoint and set for
normally energized, latching operation.
Relay 3 – Configured to trip above the Alarm setpoint and set for
normally energized, latching operation, not for horn operation.
Alarm Delay – Configured for two-second delay.
•
WARNING OR ALARM — Each relay can be assigned to either the
Warning or Alarm setpoint. As shown in the DIP SWITCH FUNCTIONS
chart, switches D3, D6, and C6 configure each relay. When Warning is
selected, the relay will activate when the Warning lamp on the front
panel lights. When Alarm is selected, the relay will activate with the
Alarm lamp on the front panel.
•
NORMALLY ENERGIZED/DE-ENERGIZED — Relays one through three
are factory set to the normally energized mode, providing “Fail-Safe”
operation. This means the relays are energized in a normal condition
and will de-energize for a Warning or Alarm condition, or if power is
lost to the system. However, operation in this mode will reduce the
period of operation on Battery Back-up. The relays may be set to the
normally de-energized mode by setting switches C8, D5, and D8 to
the off position. To avoid battery drain and internal heat generation,
unused relays should be set to Normally De-Energized.
•
LATCHING OR NON-LATCHING — Relays may be either Latching
or Non-latching. A latching relay activates when gas concentration
exceeds the setpoint, but will only de-activate when the push-button
on the front of the receiver is pressed after the gas concentration has
fallen below the setpoint. A non-latching relay will automatically deactivate when the gas concentration falls below the setpoint. Selection of the latch/non-latch function uses switches D4, D7, and C7.
•
EXTERNAL HORN RELAY — Relay 3 provides an additional configuration option not available on relays 1 or 2. Switch C5 allows Relay 3 to
be configured for use in activating an external audible horn. When
switch C5 is on, any external horn tied to Relay 3 will sound intermittently when the warning setpoint is exceeded and will go to steady-on
when the alarm setpoint is exceeded. The relay will de-activate when
24
ACUTEC™ 35 SYSTEM
the push-button switch is pressed or when the remote reset terminals
are connected, silencing the external horn.
3.2.5
Alarm Delay
A time delay precedes the activation of alarm relays to eliminate false
alarms due to electrical transients. The delay is factory set to two seconds,
but can be changed to 10 seconds with switch B1. The delay time affects
both the alarm indicator lamps and the associated relays.
3.2.6
Display Intensity (Monitor Units Only)
The LED numeric display is factory set in the normal intensity mode,
and can be set for high intensity by the user; however, to avoid internal
heating, and battery drain, it is recommended that the display remain
at normal intensity. Switch D2 is used to select normal or high intensity
display mode.
3.2.7
Auto-Test Enable
The receiver module is shipped from the factory with the Auto-Test option disabled. If the Autotest Gas Generator (optional) is installed on the
system, the receiver module cover must be removed and the autotest
switch (D1) must be moved to the “on” position.
NOTE: The Auto-Test option is for indoor use only, and should only
be used with detectors set to the standard range or lower, as listed
in Section 1.1 – Technical Data. If used with higher ranges, the generator may not produce enough gas to test the sensor.
3.3
Receiver Module Startup
Receiver front panels contain three LED bars which indicate Warning,
Alarm, and Sensor Trouble conditions. A fourth, green bar LED is marked
with the type of gas which the receiver operates with. Monitor type
receivers have a four digit numeric LED display which indicates gas concentration in ppm.
When power is first applied, all alarm functions will be inhibited for five
minutes while the system is allowed to stabilize. This is indicated by
Warning and Alarm lamps flashing in an alternating pattern. Monitors
will display the Full Scale Range setting for three seconds, then the Warning Setpoint for three seconds, followed by the Alarm Setpoint for three
seconds. The display will then indicate the detected gas level, which will
appear to be high until the sensor stabilizes.
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ACUTEC™ 35 SYSTEM
NOTE: It is strongly recommended that sensors be powered overnight
upon initial startup before adjustments are made and before connections are made to alarm relays. Sensors which are powered for
the first time may remain in an alarm state beyond the five minute
inhibit period and may take several hours to fully stabilize.
3.3.1
Alarm Acknowledge and Reset
The front panel of the Receiver contains one push-button, marked Accept/Reset, which is used for a number of different functions. When the
Receiver is in normal operation, a gas leak that exceeds the warning
setpoint will cause the Warning indicator to flash and the internal horn
to sound intermittently. If the alarm setpoint is exceeded, the Alarm
indicator will flash and the horn will sound steadily. Pressing the button
the first time will silence the audible horn, and will change the Warning
and Alarm indicators from flash to steady-on. The Warning indicator will
automatically shut off when gas concentration falls below the setpoint,
but the Alarm indicator will remain on. Pressing the button after the gas
has cleared will reset the Alarm indicator.
Operation of the alarm relays depends on the configuration selected for
each one (see paragraph 3.2.1, Configuration Switches).
3.3.2
Sensor Trouble Alarm and Relays
Receivers contain a Trouble Relay which is associated with the Sensor
Trouble indicator. A Sensor Trouble Alarm will be activated if the transmitter input is disconnected or shorted or if the Detector fails to pass
an auto-test. If these conditions occur, the Sensor Trouble indicator
will light, the horn will sound intermittently, and the Trouble Relay will
change state. Note that the Trouble Relay is a fail-safe relay. Under normal
conditions, the coil of this relay is energized, and it de-energizes when a
Sensor Trouble Alarm occurs or if power fails. After the trouble condition
clears, press the push-button or close the remote reset contacts to reset
the Sensor Trouble Alarm.
3.3.3
Auto-Test Function
NOTE: The Auto-Test option is for indoor use only, and should only
be used with detectors set to the standard range or lower, as listed
in Section 1.1 – Technical Data. If used with higher ranges, the generator may not produce enough gas to test the sensor.
The optional Auto-Test feature verifies the proper operation of gas detection systems automatically. It is enabled when configuration switch D1
is in the “on” position. Auto-Test uses an electrochemical Gas Generator
attached to the gas sensor and controlled from the receiver. Every 24
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ACUTEC™ 35 SYSTEM
hours, the microcomputer in the receiver activates the Gas Generator
and monitors the output of the gas sensor.
During the time when an Auto-Test is in progress, the alarm relays are
inhibited. This is indicated by the warning and alarm indicators alternately
flashing. Typically, an auto-test will last only a few seconds. After completion of the test the alarm response will be delayed to allow gas to clear
from the sensor/generator and for the sensor to recover. The system will
be fully inhibited for two minutes, followed by an eight minute period
during which the detector will respond only to gas levels of greater than
50% of full scale.
When the Auto-Test is activated, the generator will turn on for a maximum
of five minutes. If no sensor response is detected during this time, the
generator will turn off and the receiver will wait for 15 minutes before
initiating another Auto-Test. If it fails this second test, a Sensor Trouble
Alarm will be initiated, as described earlier. The Receiver will auto-test
two more times at one hour intervals. If the sensor passes either of these
tests, the Sensor Trouble Alarm will reset.
3.3.4
Lamp and Horn Test
When the Receiver is in the normal mode, pressing the push-button and
holding it for two seconds will illuminate all digital display segments
and LED indicator bars, and will sound the internal horn. Upon releasing
the button, the receiver will return to its previous state.
3.3.5
Relay Inhibit
Alarm relays in the Receiver can be inhibited for up to four hours to allow
calibration or testing of Sensor/Transmitters without activating external
alarm or control devices.
To initiate the inhibit mode, with the Receiver in the normal mode, press
and hold the push-button for approximately five seconds. The lamp test
will occur first, but continue to hold the button down. Once the lamps have
shut off, release the button. The warning and alarm lamps will begin to
flash alternately for a few seconds. If the Auto-Test configuration switch is
in the “on” position and the push-button is not pressed, the Sensor trouble
lamp will flash after the Alarm/Warning lamps have stopped flashing. If
no action is taken, the Receiver will return to the normal mode.
If the push-button is pressed and released while the warning and alarm
lamps are in alternating flash, the Receiver will go into the relay inhibit
mode. The warning and alarm lamps will continue their alternating rapid
flash, and the Receiver will remain in inhibit for four hours or until the
button is pressed again. During this period, the display will indicate gas
concentration, and the 4-20 mA output will be held at the level it was at
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ACUTEC™ 35 SYSTEM
before inhibit was initiated, but the relays will not activate. Transmitters
may be calibrated while the inhibit is on without setting off external
alarms.
When the receiver is in inhibit, the display reads the actual signal down
to 0 ppm, and will read negative if the sensor is out of calibration. Normally, the microcomputer sets the display to zero when the signal is less
than two percent of full scale, to avoid false readings due to drift and
environmental conditions. Because relays are inhibited and the display
blanking is bypassed, the inhibit mode is convenient for calibrating the
Sensor/Transmitter.
3.3.6
Manual Auto-Test
Gas detection systems purchased with the optional Autotest Generator
may be tested by manual activation of the Generator from the receiver
module. This function will operate only if the Auto-Test configuration
switch D1 is “on”. To manually start the Auto-Test function, with the Receiver in the normal mode, follow the sequence described in paragraph
3.3.5, Relay Inhibit, but press the push-button when the Sensor trouble
lamp is flashing. The horn will sound a quick beep and the green gas
indicator will begin to flash, indicating that the generator is running. The
system will go through a normal Auto-Test sequence, exactly the same
as the sequence used every 24 hours. The display will show increasing
gas values as the sensor begins to respond. When the microcomputer
identifies a successful test, the horn will sound one beep. The relay inhibit
indication will remain on until the sensor has had time to recover.
If the test fails, a Sensor trouble response will be initiated. Pressing the
push-button will silence the horn, but the Sensor trouble contact and
light will remain latched on, and cannot be reset until after a 10-minute
period. The Sensor/Transmitter should be checked. Either the Sensor or
Generator has failed, or something is physically blocking the path between the two. Methods for testing individual gas sensors can be found
in Section 4 – Service.
3.3.7
Remote Reset
Receivers are provided with input terminals for connection of a remote
reset switch. The remote reset input provides horn silence and alarm reset
functions using a switch located at any remote point. When receivers are
located at sites with telemetry equipment, the remote reset input may
be connected to a relay contact in the telemetry system.
The remote reset input accomplishes the same acknowledge and reset
functions as the push-button on the front panel. When a switch closure
is detected across the remote reset terminals, the detector horn will silence and any latching relays will reset, provided that the gas condition
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ACUTEC™ 35 SYSTEM
has cleared. The remote reset input will not activate any of the testing
or inhibit functions of the receiver.
3.3.8
Analog Output
Monitor Receivers provide an isolated 4-20 mA output signal for interface
with recorders, data loggers, or computer systems. The span of the 4-20
mA signal is the same as the range of the receiver selected during the
receiver configuration. The output will drive loads of 0 to 1000 ohms.
3.4
Sensor/Transmitter Operation
Gas sensors are attached directly to transmitter boxes with a water-tight
seal. A short sensor cable plugs into the transmitter circuit board. The
optional Gas Generator is attached to the sensor and connects to a terminal block on the circuit board.
The Receiver provides power to the Sensor/Transmitter through a twoconductor cable, which is also used to transmit the signal back to the
Receiver. The Sensor/Transmitter may not be used with a separate power
source.
3.4.1
Sensor Installation (See Dwg. 50.130.150.001)
Sensor/Transmitters must be mounted with the sensor horizontal.
NOTE: Gas sensors are shipped with a protective red plastic cap over
the end. This cap should be left in place to avoid damage to the sensor physically or from chemical vapors, until ready for service. This
cap must be removed when the sensor is placed in service.
Installation wiring requires connection of a two-conductor cable from
the receiver to TB1 as shown. This connection is not polarity sensitive;
either conductor can be connected to either terminal.
The Autotest Generator is connected to TB2. Polarity must be observed
as shown.
NOTE: The Auto-Test option is for indoor use only, and should only
be used with detectors set to the standard range or lower, as listed
in Section 1.1 – Technical Data. If used with higher ranges, the Generator may not produce enough gas to test the sensor.
It is recommended that when first installed, a sensor should be connected
to a Receiver and allowed to stabilize for approximately 12 hours. The
sensor should then be zeroed as described in Section 4 – Service.
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ACUTEC™ 35 SYSTEM
3.4.2
Sensor Location (Chlorine, Sulfur Dioxide, And Ammonia)
Chlorine and Sulfur Dioxide gases are heavier than air and will tend to accumulate near the floor in a closed room with little air movement. Ideally,
these sensors should be located one to two feet off the floor in closed
storage rooms, but may be located at higher elevations where good air
flow will quickly mix any leaking gas throughout the space.
Ammonia gas is lighter than air and will tend to accumulate near the ceiling in a closed room with little air movement. Ideally, this sensor should
be located near the ceiling in closed storage rooms, but may be located
at lower elevations where good air flow will quickly mix any leaking gas
throughout the space.
Outdoor sensor locations require that prevailing wind patterns, likely
personnel work areas, and most probable leak sources all be evaluated
to determine where sensors will detect gas most reliably. Autotest Generators are not for outdoor use. However, because of outside influences,
such as wind direction, outside operation is questionable.
3.5
Battery Back-Up Operation
When power is applied to the power supply module, a relay on the Battery Back-up circuit board energizes and places the Battery Back-up into
operation. To unlatch battery, see paragraph 4.1, Removing Unit From
Service. There are no user adjustments in the Battery Back-up unit. If
the battery is not fully charged, the power supply will begin supplying
charge current to the battery, and will float charge the battery as long
as the power supply is on.
If the power supply loses its input power, the Battery Back-up will immediately supply power to receiver modules to maintain detection system
operation without interruption. The back-up period varies depending on
whether the detector is single or dual channel, on whether displays are in
normal or high intensity mode, and on how many relays are configured
for fail-safe operation. Minimum expected Battery Back-up is 12 hours
for single channel and six hours for dual channel.
The circuit board attached to the battery serves two functions. First, it
limits battery charging current to a maximum of 0.75 amps. This prevents
possible damage to the battery due to an excessively high charge current.
Second, a low-voltage drop-out relay isolates the battery from the detection system when the battery voltage falls below 10 volts. This protects
the battery against damage caused by the deep discharge.
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ACUTEC™ 35 SYSTEM
s
GAS DETECTOR SYSTEM - ASSEMBLY
50.130.160.001
ISSUE 1
WT.050.130.000.UA.IM.1108
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ACUTEC™ 35 SYSTEM
WT.050.130.000.UA.IM.1108
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ACUTEC™ 35 SYSTEM
SECTION 4 – SERVICE
List Of Contents
PARA./DWG. NO.
Removing Unit from Service .................................... 4.1
Sensor Service ........................................................ 4.2
General Sensor Response Test .............................. 4.2.1
Chlorine Sensor Response Test ............................. 4.2.2
Sulfur Dioxide Sensor Response Test ..................... 4.2.3
Ammonia Sensor Response Test ........................... 4.2.4
Sensor Replacement ............................................... 4.3
Gas Generator Replacement .................................... 4.4
Sensor Calibration .................................................. 4.5
Zero Adjustment .................................................. 4.5.1
Transmitter Span.................................................. 4.5.2
Range Adjustment ............................................... 4.5.3
Battery Replacement............................................... 4.6
Routine Service....................................................... 4.7
Troubleshooting ..................................................... 4.8
Warning/Caution Summary Page ............................. 1 Page
Illustrations
Service – Sensor/Transmitter ................................ 50.130.150.001
WT.050.130.000.UA.IM.1108
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ACUTEC™ 35 SYSTEM
4.1
Removing Unit From Service
The low-voltage drop-out relay on the Battery Back-up unit is energized
as soon as power is applied to the power supply module. Once energized,
the coil current is supplied from the power supply module initially, but
will be supplied from the battery if power is removed from the power
supply module, or if the module is disconnected from the battery. If the
gas detection system supported by the Battery Back-up is started up for
testing and then shut down, the Battery Back-up relay should be deenergized manually; otherwise, the relay coil will continue to drain the
battery until the 10 volt level is reached. This will shorten the life of the
battery, and the battery will be discharged when the detection system
is started up again.
To de-energize the relay, slide the control circuit board off the battery
terminals until the relay coil drops out (there will be a click), and then
slide it back on. As soon as the battery connection is broken, the relay
coil will drop out, and will not energize until power is again applied to
the power supply module. This procedure is recommended any time the
detection system is removed from service.
4.2
4.2.1
Sensor Service
General Sensor Response Test
Gas sensors should be checked regularly for proper response. For systems
not equipped with Auto-Test, at least monthly manual sensor response
testing is recommended.
The sensor response test described below should also be used if the AutoTest system detects a sensing failure and lights the Sensor trouble lamp.
If the sensor responds to manually applied gas but not to the Autotest
Generator, replace the generator.
The sensor response test will activate alarm relays unless they are inhibited as described in paragraph 3.3.5, Relay Inhibit. Sensor response to
the test gas may be observed by: viewing the digital display on Monitor
Receivers, by monitoring the voltage at the test points in the transmitter,
by viewing the Warning and Alarm lights on the Receiver, or by observing
the operation of alarm relays in the receiver.
4.2.2
Chlorine Sensor Response Test
A high concentration of chlorine gas can be obtained from powdered
calcium hypochlorite (HTH) available from any swimming pool supply.
Place a teaspoon of calcium hypochlorite into a plastic bottle and keep
the bottle capped until ready to test the sensor. Open the bottle and
place the mouth near the sensor. After the sensor response has been
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ACUTEC™ 35 SYSTEM
verified, immediately remove the bottle as prolonged exposure to high
concentrations of chlorine will shorten the life of the sensor. If no response is observed, the sensor may need to be replaced. See paragraph
4.8, Troubleshooting.
4.2.3
Sulfur Dioxide Sensor Response Test
Sulfur Dioxide sensors can be tested with fresh powdered sodium bisulfite
placed in a squeeze bottle. A vapor of a few ppm can be squeezed toward
the sensor. If the sensor does not respond, it may need to be replaced.
See paragraph 4.8, Troubleshooting.
NOTE: If the sodium bisulfite is not fresh, it may not produce a high
enough concentration to test the sensor.
4.2.4
Ammonia Sensor Response Test
Ammonia sensors can be tested using ordinary ammonia solution used
for cleaning. Open a bottle of ammonia solution and carefully move the
mouth of the bottle near the sensor. Do not splash liquid ammonia solution on the sensor or it could damage the sensor. When the mouth of the
bottle is approximately one inch from the sensor, a rapid response should
be observed. Immediately remove the ammonia bottle as prolonged
exposure to high concentrations of ammonia will shorten the life of the
sensor. If the sensor does not respond it may need to be replaced. See
paragraph 4.8, Troubleshooting.
4.3
Sensor Replacement (See Dwg. 50.130.150.001)
Open the Transmitter and unplug the Sensor cable from the transmitter circuit board. Unscrew the Sensor from the nut on the inside of the
enclosure and screw in the replacement Sensor.
Connect the new Sensor to the pins on the transmitter board and replace
the Transmitter cover. After a new Sensor has been connected, allow 12
hours for the new Sensor to completely stabilize. Then perform zero and
span adjustments as described in this section.
!
WARNING: THE GENERAL SENSOR RESPONSE TEST, AS DESCRIBED
ABOVE, MUST BE PERFORMED WHENEVER A NEW SENSOR IS INSTALLED.
NOTE: It is strongly recommended that sensors be powered overnight upon initial startup before adjustments are made and before
connections are made to alarm relays. Sensors that are powered for
the first time may remain in an alarm state beyond the five-minute
inhibit period and may take several hours to fully stabilize.
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ACUTEC™ 35 SYSTEM
4.4
Gas Generator Replacement (See Dwg. 50.130.150.001)
To replace, disconnect the Generator leads from the terminal block marked
TB2. Loosen the cable gland, pull the wires out of the enclosure, and
unscrew the Generator from the sensor. Reverse the process to install
the new Generator. Observe the wiring polarity when installing the new
Generator.
Once installed, the new Generator should be tested by running the Manual
Auto-Test procedure described in paragraph 3.3.6. If no sensor response
is observed, recheck the Generator connection to be sure the polarity is
correct and that switch D1 in the Receiver Module is in the “on” position.
If the sensor still does not respond, test the sensor with the appropriate
Sensor Response Test described in paragraph 4.2. If the sensor does not
respond, replace it. If the sensor responds properly, contact Siemens
Water Technologies for assistance with the Generator.
4.5
Sensor Calibration (See Dwg. 50.130.150.001)
The zero may drift with temperature, and it is recommended that the
sensor zero be adjusted upon initial installation and every month after.
At minimum, seasonal adjustments should be made to avoid false alarms
due to zero drift.
For applications where precise indication of gas level is required, Sensor/Transmitters should be spanned every three to six months. The best
calibration sources are generally 10% accurate, and a Sensor/Transmitter
will normally change sensitivity by less than 25% over 12-months time. If
on-site calibration is not practical, it is recommended that a new, factory
calibrated Sensor/Transmitter be purchased every two years.
NOTE: It is essential that the transmitter zero and span adjustments
be re-calibrated whenever sensors or transmitter circuit boards are
replaced independently.
Calibration of the Sensor/Transmitter requires a digital volt meter (DVM),
a source of calibration gas and a calibration adapter for the sensor.
For CHLORINE, electrochemical generators are typically used for calibration gas. SULFUR DIOXIDE gas can be obtained in disposable cylinders
from specialty gas suppliers. AMMONIA calibration gas can be obtained
in refillable high pressure cylinders from specialty gas suppliers. For more
information on calibration gas equipment, contact your Siemens Water
Technologies equipment distributor.
Proper tubing should be used to connect gas sources to sensors, particularly chlorine. Polyethylene tubing is recommended for all gases.
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ACUTEC™ 35 SYSTEM
Prior to calibration, remove the cover from the Sensor/Transmitter enclosure and connect a DVM to the test points as shown in Figure 4.1. The
test points will provide a 0-1.00 Vdc signal proportional to transmitter
range. For example, a range of 0 to 10 ppm, 0 ppm is 0.00 volts and 10.0
ppm is 1.00 volts.
Figure 4.1 - Sensor/Transmitter Enclosure
NOTE: If alarm relays at the receiver are connected to devices that
should not be activated during calibration, place the receiver into
“alarm inhibit” as described in paragraph 3.3.5, Relay Inhibit, prior
to calibrating the Sensor/Transmitter.
4.5.1
Zero Adjustment (See Dwg. 50.130.150.001)
Before adjusting the zero, allow the sensor to fully stabilize by leaving it
on for approximately 12 hours. Ambient air must be “clean”.
The zero can be adjusted with just a DVM. Connect the meter to the test
points, and adjust the zero potentiometer until a stable value of 0.00
volts is obtained.
4.5.2
Transmitter Span (See Dwg. 50.130.150.001)
Before adjusting the span, the sensor must be fully stabilized and the
zero adjusted. See paragraph 4.5.1, Zero Adjustment.
If a Sensor/Transmitter is equipped with an Autotest Generator, it must
first be unscrewed from the sensor. The Calibration Adapter can then be
attached to the sensor.
The calibration gas is connected to the calibration adapter with an appropriate tube. When used, gas generators must be allowed to stabilize
according to the manufacturer’s directions. Calibration gas is applied at
approximately 500 cc/min and should be allowed to flow to the sensor
for 10 minutes before adjusting the span.
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37
ACUTEC™ 35 SYSTEM
Connect the DVM to the transmitter test points. Adjust the span potentiometer until a stable voltage reading is obtained according to the
following equation:
V = Span Gas Concentration ÷ Transmitter Range
As an example, if the calibration gas is 3 ppm and the Sensor/Transmitter
range is 0 to 5 ppm, the voltage should be adjusted to 3 ÷ 5 = 0.6V.
If the receiver was placed in the “inhibit” mode prior to calibration, press
the pushbutton switch on the receiver to return the system to normal
operation.
4.5.3
Range Adjustment (See Dwg. 50.130.150.001)
Sensor/Transmitters are factory calibrated at the Standard Ranges as
listed in Section 1.1 – Technical Data, but can be changed within the
limits listed in that Section.
The range can be changed by first setting the range configuration
switches, C1 to C4, in the Receiver Module as described in paragraph 3.2,
Receiver Module Operation. The transmitter span must then be adjusted
as described above.
4.6
Battery Replacement (See Dwg. 50.130.000.003)
!
WARNING: TO AVOID POSSIBLE SEVERE PERSONAL INJURY OR
EQUIPMENT DAMAGE, HANDLE BATTERIES WITH CARE, BEING
CERTAIN NOT TO SHORT TERMINALS, AS SEVERE ARCING OR
EXPLOSION COULD OCCUR.
Remove the battery enclosure cover. Pull the plug off the circuit board.
Cut the strap holding the battery in place, then pull the battery out. Slide
circuit board off battery terminals.
To install the new battery, reverse above procedure. A new strap is supplied with replacement batteries. The battery should be installed with
the terminals to the rear of the enclosure.
WT.050.130.000.UA.IM.1108
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ACUTEC™ 35 SYSTEM
4.7
Routine Service
!
WARNING: TO AVOID POSSIBLE SEVERE PERSONAL INJURY OR EQUIPMENT DAMAGE, DUE TO UNDETECTED LEAKS OF DANGEROUS GAS,
THE FOLLOWING SERVICE MUST BE PERFORMED TO VERIFY OPERATION OF THIS GAS DETECTOR.
•
MONTHLY
a. Test sensor response with actual gas if Autotest Generator is not
installed. However, if a higher degree of confidence is desired,
the sensor may be tested more often.
b. Adjust sensor zero potentiometer.
c. Clean battery vent.
d. Verify that the Battery Back-up works by removing ac power.
•
QUARTERLY
Adjust the sensor span potentiometer (optional—requires a gas calibration device). (Not supplied by Siemens Water Technologies.)
NOTE: Span adjustment is recommended only when a precise indication of gas level is required.
WT.050.130.000.UA.IM.1108
39
ACUTEC™ 35 SYSTEM
4.8
Troubleshooting
Trouble
Receiver LEDs and indicators do
not light when power is applied
to the system.
Receiver module powers up
correctly, but does not respond
when test gas is applied to sensor/transmitter.
WT.050.130.000.UA.IM.1108
Remedy
1. Check the fuse. If the fuse is blown, replace the fuse. If
not, go to step 2.
2. Check wiring from the Power Supply Module to the
Receiver Module (see Dwgs. 50.130.130.001 and
50.130.130.002). Be sure polarity is correct. If wiring is
correct, go to step 3.
3. With a voltmeter, check the power supply at the “+12”
terminal (positive) and “C” terminal (negative) on the Receiver. If the reading is between 13.6 to 13.9 Vdc, replace
the Receiver. If the voltage is above 13.9 V, go to step 5. If
the voltage is below 13.6 V, go to step 4.
4. Measure the ac input voltage at the Power Supply Module. If the voltage is not within the rated range (see
Section 1.1 - Technical Data), check ac supply. If the voltage is within the rated range, replace the Power Supply
Module.
5. If the voltage measured in step 3 is above 13.9 V, connect
another Receiver Module or a resistive load of approximately 100 ohm and 2 watts to the Power Supply output
terminals. If the voltage drops to within 13.6 - 13.9 V,
replace the Receiver. If not, replace the Power Supply
Module.
1. Disconnect the Transmitter connections at the two “TR”
terminals of the Receiver. Check the voltage on the terminals with a voltmeter. The voltage should be approximately 12 Vdc. If this voltage is not present, replace the
Receiver Module. If it is measured, go to step 2.
2. Connect a milliamp meter between the two “TR” terminals
of the Receiver. The current should be 15 to 25 mA. If this
current is not measured, replace the Receiver Module. If
it is measured, refer to the Sensor/Transmitter paragraphs
in this Section.
40
ACUTEC™ 35 SYSTEM
WARNING LABELS AND TAGS
The following warning labels and tags are attached to the equipment.
---------------------------------------------------------------------------------------------------P60391:
Gases detected are hazardous substances, and if breathed
in high concentrations can cause death. To maintain normal
operation of this detector you must observe the following
precautions.
1. DETECTOR OPERATION MUST BE CHECKED AND VERIFIED
FREQUENTLY ON A REGULAR SCHEDULE.
2. To avoid injury from electrical shock, turn power sources
off before servicing this equipment.
3. The Siemens Water Technologies instruction book provided with this detector DETAILS installation, operation
and maintenance.
4. Operation AND maintenance of this equipment must
be restricted to trained, qualified personnel who are
completely familiar with these instructions.
---------------------------------------------------------------------------------------------------P60402:
PERSONAL INJURY OR DEATH MAY RESULT FROM EXPOSURE
TO THE DESIGNATED GAS. TEST ASSEMBLY WITH DESIGNATED GAS UPON START-UP, MONTHLY, AND IF EXPOSED TO
CHEMICALS. REPLACE OR REPAIR ASSEMBLY IMMEDIATELY
UPON TEST FAILURE. REFER TO THE SIEMENS WATER TECHNOLOGIES MANUAL.
---------------------------------------------------------------------------------------------------P60392:
*TO AVOID INJURY FROM ELECTRICAL ARCING, TURN
POWER SOURCES OFF BEFORE SERVICING THIS EQUIPMENT.
----------------------------------------------------------------------------------------------------
CAUTION LABEL
The following caution label is attached to the equipment.
---------------------------------------------------------------------------------------------------P60392:
*LEAD ACID BATTERY, DISPOSE OF PROPERLY.
---------------------------------------------------------------------------------------------------* Both on same label.
WT.050.130.000.UA.IM.1108
41
ACUTEC™ 35 SYSTEM
SENSOR/TRANSMITTER - SERVICE
50.130.150.001
ISSUE 0
WT.050.130.000.UA.IM.1108
42
11-93
ACUTEC™ 35 SYSTEM
SECTION 5 – ILLUSTRATIONS
List Of Contents
DRAWING NO.
Parts
Gas Detector System .......................................... 50.130.000.001A&B
Sensor/Transmitter Unit...................................... 50.130.000.002
U29319 Battery Back-Up .................................... 50.130.000.003
WT.050.130.000.UA.IM.1108
43
ACUTEC™ 35 SYSTEM
NOTE: MONITOR UNITS SHOWN.
GAS DETECTOR SYSTEM - PARTS
50.130.000.001A
ISSUE 1
WT.050.130.000.UA.IM.1108
44
8-08
ACUTEC™ 35 SYSTEM
KEY NO.
PART NO.
QTY.
DESCRIPTION
1
U29317
1
Single Point Detector, Base Unit
2
U29318
1
Dual Point Detector, Base Unit
3
U29316
1
Power Supply Modual
4
----
1
Receiver (See Table Below)
-
P60391
2
Warning Label (Not Shown)
GAS DETECTION SYSTEM PART NUMBERS
SYSTEM
GAS TYPE
RECEIVER TYPE
RECEIVER
SENSOR/ S
TRANSMITTER
U29360
Cl2
Detector
U29320
U29335
U29361
Cl2
Monitor
U29323
U29335
U29362
SO2
Detector
U29322
U29337
U29363
SO2
Monitor
U29325
U29337
U29364
NH3
Detector
U29321
U29336
U29365
NH3
Monitor
U29324
U29336
NOTE: S These parts shown on drawing 50.130.000.002.
WHEN ORDERING MATERIAL, ALWAYS SPECIFY MODEL AND SERIAL NUMBER OF APPARATUS.
GAS DETECTOR SYSTEM - PARTS LIST
50.130.000.001B
ISSUE 2
WT.050.130.000.UA.IM.1108
45
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ACUTEC™ 35 SYSTEM
U29335 - CHLORINE; U29337 - SULFUR DIOXIDE; U29336 - AMMONIA
SENSOR/TRANSMITTER UNIT - PARTS
50.130.000.002
ISSUE 0
WT.050.130.000.UA.IM.1108
46
11-93
ACUTEC™ 35 SYSTEM
U29319 BATTERY BACK-UP - PARTS
50.130.000.003
ISSUE 0
WT.050.130.000.UA.IM.1108
47
11-93
ACUTEC™ 35 SYSTEM
WT.050.130.000.UA.IM.1108
48
ACUTEC™ 35 SYSTEM
SECTION 6 – SPARE PARTS LIST
QTY
DESCRIPTION
1
Calibration Adapter
P 60394
1
Battery
U 29314
1
Chlorine Sensor (Cl2)
U 29329
1
Sulfur Dioxide Sensor (SO2)
U 29331
1
Ammonia Sensor (NH3)
U 29330
1
Chlorine Generator (Cl2)
U 29326
1
Sulfur Dioxide Generator (SO2)
U 29328
1
Ammonia Generator (NH3)
U 29327
Transmitter Cable
P 40231
Specify Feet
WT.050.130.000.UA.IM.1108
49
PART NO.
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