AMC 1ACOs User manual

AMC-1ACOs
One Channel CO Monitor with DSI
INSTRUCTIONS
Installation and Operation of the
1ACOs One Channel CO Monitor with DSI
IMPORTANT:
Please read these installation and operating instructions completely
and carefully before starting.
Filename: 3221405B.doc Copyright © November. 2012, AMC
The Armstrong Monitoring Corporation
215 Colonnade Road South, Ottawa, Ontario, Canada K2E 7K3
Tel: [phone] • Fax: [phone] • Canada & U.S. Toll Free: 1-800-465-5777
E-mail: [email protected] • Internet: www.armstrongmonitoring.com

AMC-1ACOs One Channel CO Monitor with DSI
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TABLE OF CONTENTS
Section Title Page
1GENERAL INFORMATION...................................................................................................1
1.1 WARRANTY ...................................................................................................................1
1.2 LIABILITY .......................................................................................................................1
1.3 PRODUCT RETURN......................................................................................................1
1.4 CONTACT INFORMATION ............................................................................................2
1.5 MODIFICATIONS AND SUBSTITUTIONS.....................................................................2
1.6 GLOSSARY....................................................................................................................3
2PRODUCT INFORMATION...................................................................................................4
3PRODUCT DESCRIPTION ...................................................................................................5
3.1 GENERAL DESCRIPTION.............................................................................................5
3.1.1 MONITOR FEATURES ...........................................................................................5
4INSTALLATION ....................................................................................................................8
4.1 MOUNTING INSTRUCTIONS ........................................................................................8
4.1.1 MONITOR MOUNTING...........................................................................................8
4.2 WIRING ..........................................................................................................................9
4.2.1 MONITOR WIRING .................................................................................................9
4.2.2 CABLE SELECTION .............................................................................................11
4.2.3 DSI WIRING ..........................................................................................................11
 On-Board Sensor Connection............................................................................12
 Building Automation Wiring................................................................................12
 VFD Wiring ........................................................................................................14
5OPERATION AND CALIBRATION.....................................................................................15
5.1 OPERATION ................................................................................................................15
5.1.1 DIP SWITCH PROGRAMMING ............................................................................15
5.1.2 ALARM RELAY PROGRAMMING ........................................................................17
5.1.3 AUDIO ALARMS ...................................................................................................17
5.1.4 GAS MONITOR INTERFACE CONFIGURATION ................................................18
5.1.5 DSI INTERFACE CONFIGURATION....................................................................19
5.1.6 POWER-ON DELAY .............................................................................................21
5.1.7 TEST SWITCH FUNCTION ..................................................................................21
5.1.8 ACKNOWLEDGE FUNCTION ..............................................................................21
5.1.9 ALARM/WARNING RELAY ACTIVATION DELAYS .............................................21
5.1.10 RELAY OUTPUTS ................................................................................................21
5.2 CALIBRATION..............................................................................................................22
5.2.1 TRIP THRESHOLD ADJUSTMENT......................................................................22
 Equipment Required ..........................................................................................23
 Trip Threshold Adjustment.................................................................................23
5.2.2 AMC-DSI CALIBRATION ......................................................................................24
 On Site Calibration Equipment Required...........................................................26
 Calibration Procedure ........................................................................................26
5.2.2.2.1 On Board Sensors ......................................................................................26
5.2.2.2.2 VFD Calibration ..........................................................................................27
 Recalibration........................................................Error! Bookmark not defined.
6PREVENTIVE MAINTENANCE ..........................................................................................28
6.1 GENERAL ....................................................................................................................28
6.2 VERIFICATION OF OPERATION ................................................................................28
6.3 SENSOR REPLACEMENT ..........................................................................................28

AMC-1ACOs One Channel CO Monitor with DSI
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7INSTALLATION TIPS AND TRICKS ..................................................................................29
LIST OF FIGURES
FIGURE 1: AMC-1ACOs, Front Cover..........................................................................................6
FIGURE 2: Internal Features of the AMC-1ACOs. .......................................................................7
FIGURE 3: Locations of Mounting Holes. .....................................................................................8
FIGURE 4: Location of Power Supply Connections....................................................................10
FIGURE 5: Relay Contact Arrangement. ....................................................................................11
FIGURE 6: Signal input/output terminal block. ...........................................................................12
FIGURE 7: Building Automation Wiring. .....................................................................................13
FIGURE 8: VFD Connecter (J4) .................................................................................................14
FIGURE 9: Gas Monitor signal input configuration jumpers .......................................................18
FIGURE 10: DSI Layout..............................................................................................................19
FIGURE 11: AMC-1ACOs Test Points and Trimpots..................................................................23
FIGURE 12: AMC-1ACOs Test Points and Trimpots..................................................................25
LIST OF TABLES
TABLE 1: Building Automation Wiring ........................................................................................13
TABLE 2: DIP-switch programming chart ...................................................................................15
TABLE 3: WARNING and ALARM Relay Active State ...............................................................17
TABLE 4: Audio alarm operation ................................................................................................17
TABLE 5: Signal input configuration jumper selection ................................................................18
TABLE 6: Dip Switch setting for DSI board.................................................................................19
TABLE 7: Detailed descriptions of dip switch settings ................................................................20
TABLE 8: Test points and trimpots allocation .............................................................................22
TABLE 9: DSI board Test points (use a voltmeter with greater than 100K input resistance)......25

AMC-1ACOs One Channel CO Monitor with DSI
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1GENERAL INFORMATION
1.1 WARRANTY
The AMC-1ACOs One Channel CO Monitor with DSI is warranted against defects in material
and workmanship for a period of two years from date of delivery. Maintenance items are not
warranted. During the warranty period, The Armstrong Monitoring Corporation will repair or
replace components that prove to be defective in the opinion of AMC. Any equipment deemed
to be defective by the user should be returned to The Armstrong Monitoring Corporation for
evaluation (see product return below). Site visits by Armstrong personnel, to evaluate/repair
equipment, are not covered by this warranty. AMC is not liable for auxiliary interfaced
equipment, nor for consequential damage. This warranty shall not apply to any product, which
has been modified in any way, which has been repaired by any other party other than a qualified
technician or authorized AMC representative, or when failure is due to misuse or conditions of
use.
Note: extended warranty mail in calibration programs are available (please call 1-800-465-
5777).
1.2 LIABILITY
All AMC products must be installed and maintained according to instructions. Only qualified
personnel should install and maintain the equipment.
AMC shall have no liability arising from auxiliary interfaced equipment, for consequential
damage, or the installation and operation of this equipment. AMC shall have no liability for
labour or freight costs, or any other costs or charges in excess of the amount of the invoice for
the products.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED,
AND SPECIFICALLY THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. THERE ARE NO WARRANTIES THAT EXTEND BEYOND THE
DESCRIPTION ON THE FACE THEREOF.
WARNING
CHECK TO ASSURE THE WORKING AREA IS FREE FROM HAZARDS DURING
INSTALLATION OR WHEN PERFORMING MAINTENANCE, AND USE PROPER
PRECAUTIONS.
1.3 PRODUCT RETURN
All products returned for warranty or service should be shipped by prepaid freight. Please obtain
a Return Material Authorization (RMA) number from AMC prior to shipping and ensure this RMA
number is clearly visible on the outside of the shipping container. Material shipped without RMA
will be rejected and returned. All products returned to the client will be shipped by freight collect.

AMC-1ACOs One Channel CO Monitor with DSI
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1.4 CONTACT INFORMATION
For information please call 1-800-465-5777 or through contacts at
www.armstrongmonitoring.com or through email directly at
[email protected].
1.5 MODIFICATIONS AND SUBSTITUTIONS
Due to an ongoing development program, AMC reserves the right to substitute components and
change specifications at any time without incurring any obligations.

AMC-1ACOs One Channel CO Monitor with DSI
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1.6 GLOSSARY
Alarm Alarm is an audible, visual, or physical
presentation designed to warn the instrument
user that a specific level of a dangerous
gas/vapor concentration has been reached or
exceeded.
Calibration Calibration is the procedure used to adjust the
instrument for proper response.
Calibration Gas Calibration Gas is a gas of known
concentration(s) used to set the instrument
span or alarm level(s).
CO Carbon Monoxide is a colorless, odorless, and
tasteless gas that is slightly lighter than air. It
is highly toxic to humans and animals in
higher quantities and is commonly produced
from engine exhaust
DSI Dual Sensor Interface card is an integrated
circuit board that adds
sensor/transmitter/VFD capabilities to the 1A
Gas Monitor
Gas Concentration Gas Concentration is measured:
PPM
PPM Parts Per Million (1% volume = 10,000PPM)
Span Full range of a sensor i.e. a CO sensor with a
full scale of 0-100 PPM has a 100 PPM span.
T90 Response Time in seconds to achieve 90% gas
concentration reading. This a typical
calibration point that allows for sensor aging,
but tends to be less accurate than a T99
calibration,
VFD variable-frequency drive is a system for
controlling the rotational speed of an
alternating current (AC) electric motor by
controlling the frequency of the electrical
power supplied to the motor.
Zero Buffering Zero buffering is transmitter function which
forces the gas concentration reading to zero
when sensor is exposed to low concentration of
a gas. The zero buffers is provided in the
sensor specification.
Zero Gas Zero gas is gas with no concentration. Clean
air is an excellent source for zero calibration.
A known gas concentration can be entered
during zero calibration.

AMC-1ACOs One Channel CO Monitor with DSI
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2PRODUCT INFORMATION
Monitor Part Number….…………………………………. AMC-1ACOs
Monitor Serial Number. ………………..………………...
Monitor Warranty Period. ………………………..……… 2 years
DSI Part Number…………………………………………. AMC-DSVI-91AM-NC-X
DSI Serial Number. ………………..……………….........
DSI Warranty Period……………………………………... 2 years
Sensor Warranty Period…………………………………. Channel 1 _________________
Power Supply Requirement. ………………….……..…. 120 VAC, 60 Hz, 30 VA
Operating Temperature.…….………………….……..… -20°C to +40°C (-4°F to +104°F)
Operating Pressure..…………….…………….……..….. Ambient atmospheric pressure
Relative Humidity..…………….…………….……..…….. 0 – 95% non-condensing.
Alarm Trip Points
Signal Input
Configuration Part No. Serial No. Type of Gas Warning Alarm
Full
Scale
On-board Ch1 91AM CO
TORQUE SPECIFICATIONS:
POWER SUPPLY:
Neutral terminal screw ……………………………………………………………… 7 pound-inches.
Hot terminal screw …………………………………………………………...……... 7 pound-inches.
Ground Lug screw. …………………………………………………………………. 15 pound-inches.
RELAY:
Relay socket terminal screws ……………………………………………………… 7 pound-inches.
Note:
All Armstrong Monitoring systems must be installed and maintained according to
instructions, to ensure proper operation. Only qualified technicians should install and
maintain the equipment.

AMC-1ACOs One Channel CO Monitor with DSI
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3PRODUCT DESCRIPTION
3.1 GENERAL DESCRIPTION
The AMC-1ACOs One Channel CO Monitor with DSI is a single channel gas monitoring system
designed to provide continuous, reliable surveillance of surrounding air for traces of CO. The
DSI has an optional VFD output for signaling and/or powering a VFD controller, refer to section
x for more. The monitor comes with the following features, see Figures 1 and 2.
3.1.1 MONITOR FEATURES
1. RUN/FAULT/OFF INDICATOR: A green LED for each channel.
RUN: LED on
FAULT: LED flashing
OFF: LED off
2. WARNING INDICATOR: Warning levels of gas are indicated by a yellow LED.
Warning concentrations are indicated in Section 2
3. ALARM INDICATOR: Alarm levels of gas are indicated by a red LED. Alarm
concentrations are indicated in Section 2
4. POWER TERMINAL BLOCK: For line voltage connections of 120 VAC, 60 Hz
5. TRANSFORMER: A step down transformer powers the internal circuitry
and remote sensor/transmitters at low voltages. Optional
secondary transformer, used in specific VFD options,
may be installed. Transformer(s) located underneath the
PCB.
6. INTERNAL WIRING HEADER: Provides wiring connection points as follows:
1,2,3 - Relay coils
4,5,6,7,8 - Reserved
9,10 - Acknowledge switch
11,12 - Audio alarm indicator
7. AUDIO ALARM INDICATOR: The buzzer will activate for Alarm, Warning
(configurable) and Fault conditions, with a distinct
cadence for each one
8. RELAY SETUP JUMPERS: Used to independently configure the Warning and Alarm
relays as Normally Energized or Non-Energized
9. TEST SWITCH: The test switch is provided to electronically simulate
alarms in order to test audio and relay functions
10. TRIP POINT ADJUSTMENT: Sets the Signal adjust, Alarm and Warning

AMC-1ACOs One Channel CO Monitor with DSI
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11. PROGRAMMING DIP
SWITCHES:
Allows user to configure the alarm delay and timer
circuits, audio alarm activation, sensor mode selection,
fault threshold, and acknowledge switch function
12. RELAYS: 2 alarm DPDT relays are provided
13. DSI (Dual Sensor Interface): Dual sensor interface: allows on board CO sensor signal
in and a 4-20mA signal out
14. ON-BOARD CO SENSOR: Sensor allows local detection of CO gas
15. SIGNAL INPUT/OUTPUT
TERMINAL BLOCK:
123456
Allows connection to transmitter input and output
1 - Signal Ground, “-“
2 - 4-20 mA Current Output
3- Power, V+, “+”
4- 4-20 mA Current Input
5 - Chassis Ground
6- Signal Ground, “-“
1. RUN/FAULT/OFF
2. WARNING
3. ALARM INDICATOR
INDICATOR
INDICATOR
!
ALARM
WARNING
CALIBRATE REGULARLY FOR SAFETY
12
(800)-465-5777
GAS MONITOR
RUN/ FAULT/ OFF
www.armstrongmonitoring.com
FIGURE 1: AMC-1ACOs, Front Cover

AMC-1ACOs One Channel CO Monitor with DSI
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9. TEST SWITCH
10. TRIP POINT ADJUSTMENT
7. AUDIO ALARM
INDICATOR
5. TRANSFORMER
(UNDER PCB)
11. PROGRAMMING
DIP SWITCHES
8. RELAY SETUP
JUMPERS
6. INTERNAL WIRING
HEADER
4. POWER TERMINAL
14. ON-BOARD CO SENSOR
15. SIGNAL INPUT/OUTPUT
TERMINAL BLOCK
12. RELAYS
BLOCK
RV6
RV5
TP6
TP5
TP4
Sensor 1
TP22
GND
13. DSI
(
DUAL SENSOR INTERFACE
RV4
CHANNEL 1
SENSOR
(UNDER PCB)
CHANNEL 1
FIGURE 2: Internal Features of the AMC-1ACOs.

AMC-1ACOs One Channel CO Monitor with DSI
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4INSTALLATION
Follow the guidelines in this section for proper locations and installation of the AMC-1ACOs. In
addition to these instructions, ensure installation is compliant with local building and electrical
codes. This section covers topics related to installation location, mounting, cable selection, and
wiring instructions the AMC-1ACOs.
4.1 MOUNTING INSTRUCTIONS
4.1.1 MONITOR MOUNTING
Securely fasten the AMC-1ACOs unit on a solid, non-vibrating surface or structure. Install the
unit where it is not exposed to rain or water spray. Install in an area where the local
concentration of gas is unaffected by the presence of ventilation systems and away from
sources of interference gases. Mount the monitor where the unit can be observed periodically.
For most applications the monitor should be mounted 1.2 -1.8 m (4-6 ft) from the floor. See
Figure 3 for mounting hole locations.
CAUTION: All cable entry MUST BE through the BOTTOM of the monitor enclosure only.
Other entry locations will allow foreign materials to enter the enclosure, causing possible
damage to the internal components.
4 HOLES
(8.875")
(5.500")
(Ø0.375")
225 mm
140 mm
Ø9.5 mm
!
ALARM
WARNING
CALIBRATE REGULARLY FOR SAFETY
12
(800)-465-5777
GAS MONITOR
RUN/ FAULT/ OFF
www.armstrongmonitoring.com
FIGURE 3: Locations of Mounting Holes.

AMC-1ACOs One Channel CO Monitor with DSI
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4.2 WIRING
4.2.1 MONITOR WIRING
POWER SUPPLY: CAUTION: Ensure to take all proper precautions when handling high
voltage power sources.
The monitor operates on 120 VAC, 60 Hz. A step down transformer
powers the internal circuitry and remote sensor/transmitters at low
voltages. The power supply connections are made at the power
terminal block located inside the monitor, see Figure 4.
RELAYS: When 2 or 3 relays are included with the monitor, “Ice Cube” DPDT
relays are used. Two of the relays are set for different alarm
conditions and the optional third relay is a Fault relay. The contacts
are rated for 10Amps@250VAC resistive. For relay contact
arrangement, see Figure 5.
The AMC-1ACOs is shipped with relays factory configured per customer order, typically as de-
energized in the non-alarm state. If the user prefers to have relays in a normally energized
(failsafe) state see section 5.1.2 for jumper configuration.
All settings are factory configured, as per original customer order, for use with the installed
sensor. Certain user options however may be set according to preferences in the field.

AMC-1ACOs One Channel CO Monitor with DSI
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AC PRIMARY
120 VAC, 60 Hz
NEUT.
HOT
CHASSIS GND
RV6
RV5
TP6
TP5
TP4
Sensor 1
TP22GND
RV4
CHANNEL 1
SENSOR
CHANNEL 1
FIGURE 4: Location of Power Supply Connections.

AMC-1ACOs One Channel CO Monitor with DSI
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FIGURE 5: Relay Contact Arrangement.
4.2.2 CABLE SELECTION
Connections from monitor are made through the DSI interface board. Connections should be
made using shielded, 2 or 3-conductor cable (depending on BAS or VFD output). For best
signal transmission and maximum noise rejection, use twisted pair, and run cable through steel
conduit (cable shield must be grounded at the monitor). For basic selection of cable size and
length (between monitor and BAS), it is recommended to use 20-16AWG wire on a distance no
longer than 2500’.
4.2.3 DSI WIRING
On the DSI board, the signal input/output terminal block (see Figure 2, item 15) allows a 4-
20mA output signal for wiring. Figure 6 shows a detailed depiction of a signal input/output
terminal block. Refer to Figure 10 for a detailed layout of the DSI board. The following
subsections detail the on-board sensor connection, building automation (BAS), and VFD wiring.

AMC-1ACOs One Channel CO Monitor with DSI
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123456
PIN DESCRIPTION
1 Signal Ground, “-“
2 4-20 mA Current Output
3 N/A
4 N/A
5 Chassis Ground
6 N/A
FIGURE 6: Signal input/output terminal block.
Note:
Use Copper Conductors Only.
 On-Board Sensor Connection
The on-board CO sensor has a socket connection to the DSI board for easy sensor replacement
in the field. For removal, unplug the sensor from the DSI when the main power supply is turned
off. For installation, hold the sensor in such a way that the sensing area is not covered. Align the
sensor pins with pin sockets on the DSI and lightly push the sensor on to the DSI. Sensors need
to be calibrated at regular intervals, see 5.6.3 AMC-DSI CALIBRATION for procedure. Sensor
replacement is needed when the sensor life has expired; see 6.3 SENSOR REPLACEMENT for
details.
CAUTION
TURN OFF THE MAIN POWER SUPPLY BEFORE REMOVING OR INSTALLING THE SENSOR(S).
 Building Automation Wiring
The building automation system is wired to the Gas Monitor through the signal input/output
terminal block on the DSI board. The wiring is conveyed in the following table.

AMC-1ACOs One Channel CO Monitor with DSI
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TABLE 1: Building Automation Wiring
Gas Monitor (DSI) Building Automation System
Negative “-“ →Negative “-“
4-20mA signal output 4-20mA out →4-20mA signal input 4-20mA in
Positive “+” →Not applicable
4-20mA signal input 4-20mA in →Not applicable
Chassis ground CGND →Connect to shield of cable CGND
Signal ground “-“ →Not applicable
NOTE
MAXIMUM LOAD RESISTANCE IS 500 OHMS
EXAMPLE CONNECTION
SENSE RESISTOR + LOOP
SENSE RESISTOR
<= 500 Ohms
CHANNEL 1
CHANNEL 1
Chassis Ground
1
2
3
4
5
6
123456
Ground Out
(N/A)
(N/A)
(N/A)
4-20mA Out
FIGURE 7: Building Automation Wiring.

AMC-1ACOs One Channel CO Monitor with DSI
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 VFD Wiring
When a DSI board is equipped with the VFD option, connectors J4 and J2 are installed. Refer to
Figure 10 for a detailed layout of the DSI board. The VFD signal and external power is wired
through J4; while the optional additional transformer is factory installed through J2. Figure 8
shows a detail description of the VFD connector (J4). When the additional transformer is not
employed there will not be a 24VAC voltage on pin 1 of J4.
PIN DESCRIPTION
1 24VAC Power Output to VFD
2 Chassis Ground
3 Signal Ground, “-“
4 Signal Output (Current or Voltage)
FIGURE 8: VFD Connecter (J4)
1
J4
234

AMC-1ACOs One Channel CO Monitor with DSI
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5OPERATION AND CALIBRATION
5.1 OPERATION
5.1.1 DIP SWITCH PROGRAMMING
The 1A circuit board has two blocks of DlP-switches, located under the DSI Board, for
configuring the various functions of the 1A; see Figure 2, item 12. Each DIP-switch can be set
to OFF (left position) or ON (right position) depending on functions required.
Positions shown in Bold are typical settings for the AMC-1ACOs.
CAUTION
TURN OFF THE MAIN POWER SUPPLY BEFORE REMOVING THE DSI BOARD TO MODFIY DIP
SWITCHES.
TABLE 2: DIP-switch programming chart
Switch Feature Position Description
OFF Warning and alarm relays are automatically de-activated
once activating condition has been removed and
minimum run timer has expired.
SW1-1 Activate
Alarms until
Acknowledge
(Latching
Relays) ON Once activated, warning and alarm relays remain
activated (latched) until activation condition has been
removed, minimum run timer has expired and the
Acknowledge button has been pressed.
SW1-2,
SW2-2
Minimum Run
Timer
See
Description
Warning and alarm relays are maintained in alarm state
for a minimum time interval following alarm activation, as
follows:
SW1-2 SW2-2 Minimum Run Time
OFF OFF 0 minutes
ON OFF 5 minutes
OFF ON 10 minutes
ON ON 30 minutes
Note that a sensor level falling below the alarm threshold
and then re-occurring during this time resets the alarm
timer for the associated alarm.
SW1-3,
SW1-4
Sensor Type
(Mode
Select)
See
Description
Sensor type (threshold mode) is selected as follows:
SW1-3 SW1-4 Sensor Type (Mode)
OFF OFF Both channels Increasing
ON OFF Both channels Decreasing
OFF ON Channel 1 Decreasing
Channel 2 Increasing
ON ON Reserved
SW1-6 Number of OFF Channel 1 and 2 are enabled.

AMC-1ACOs One Channel CO Monitor with DSI
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Switch Feature Position Description
Sensors ON Only channel 1 enabled.
With two sensor/channels (SW1-6 Off) and one group of
relays (SW1-8 On), this dipswitch configures the two
relays of group 1 to function as warning and alarm for a
single zone, or each relay acts as the Alarm relay for
each sensor/channel (Sensor/channel 1 with group 1
warning and Sensor/Channel 2 with group 1 Alarm). The
Alarm Relay Activated when Fail is detected (SW2-1)
applies to both relays when two zone is configured.
OFF One zone.
SW1-7 Two Zone
Enabled
ON Two zones.
OFF Two groups of relays (group1: Warning/J2-2 and
Alarm/J2-3 and group2: Warning/J2-6 and Alarm/J2-7)
and Fault/J2-4 are enabled.
Signals exceeding thresholds on channel 1 activate
group 1 relays
Signals exceeding thresholds on channel 2 activate
group 2 relays
Fault relay is activated as a result of fault detection on
either channel
Alarm relay may be activated as a result of fault
detection on either channel (see SW2-1)
SW1-8 Enable One
group of
Relays
ON Only the first group of relays (Warning/J2-2 and Alarm/J2-
3) and Fault/J2-4 are enabled. See SW2-1 for double duty
Alarm and Fault.
Signals exceeding thresholds on either channel will
result in relays being activated
OFF The Alarm relay is not activated when fault is detected.
SW2-1 Alarm Relay
Activated
when Fault is
Detected
ON When fault is detected, the Alarm relay is activated.
When only one group of relays is selected (see SW1-8),
if fail is detected on a channel which is enabled (see
SW1-6) then the Alarm relay is activated
When two groups of relays are selected (see SW1-8), if
fail is detected on a channel which is enabled (see
SW1-6) then the Alarm relay associated with the
channel is activated.
OFF Audio alarm is disabled for Warning conditions
(2-threshold sensor modes only).
SW2-3 Audio Enable
for Warning
ON Audio alarm is activated in conjunction with Warning
(2-threshold sensor modes only).
SW2-4 Sensor Fault
Threshold
OFF Sensor Fault thresholds set at 0.4 mA into 250R or 100
mV.