and LBW-420-1 - Cool Air Incorporated

Models
LBW-420 (115 VAC powered)
and
LBW-420-1 (24 VDC powered)
Ammonia Leak Detectors
8-1
CAUTION & SYMBOL DEFINITIONS:
CAUTION: Gives detailed description of different situations to
avoid or not avoid for the proper operation of the
equipment.
WARNING: RISK OF ELECTRIC SHOCK. DO NOT
REMOVE COVER. NO USER SERVICEABLE
PARTS INSIDE. REFER TO QUALIFIED SERVICE
PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE. NE PAS
ENLEVER LE COUVERCLE. AUCUN ENTRETIEN
DE PIECES INTERIEURES PAR L'USAGER.
CONFIER L'ENTRETIEN AU PERSONNEL
QUALIFIE.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
TABLE OF CONTENTS
IMPORTANT—READ THIS FIRST ........................................................ 4
CAUTIONS ................................................................................................. 4
AVOIDING NUISANCE ALARMS ................................................................ 4
STANDARD FEATURES ........................................................................... 6
AVAILABLE OPTIONS ............................................................................. 7
PARTS DESCRIPTION .............................................................................. 8
FRONT PANEL DISPLAY ............................................................................ 8
AMMONIA SENSOR.................................................................................... 9
FRONT PANEL-MOUNTED CIRCUIT BOARD ............................................ 9
SERVICE SWITCH (SERVICE MODE) ...................................................... 10
THE “ENTER”, “UP”, AND “DOWN” PUSHBUTTONS ......................... 11
ROTARY SELECTOR SWITCH ................................................................. 11
ENCLOSURE-MOUNTED CIRCUIT BOARD .............................................. 13
RELAYS ................................................................................................... 16
RELAY STATUS LEDS ............................................................................. 16
EXTERNAL CONNECTIONS ..................................................................... 17
4–20 MA ANALOG OUTPUTS .................................................................. 17
INSTALLATION AND SETUP................................................................ 21
EXAMPLE APPLICATION......................................................................... 23
REMOTE SENSING...………………………………............................23
REMOTE ALARM……….…………………………............................24
BACKUP BATTERY……..…………………………............................26
PROGRAMMING AND OPERATION................................................... 27
SETTING THE DESIRED DISPLAY MODE ................................................ 28
PROGRAMMING THE AMMONIA PRE-ALARM AND ALARM SET POINTS
................................................................................................................. 28
PROGRAMMING THE HIGH AND LOW EXTERNAL TEMPERATURE SET
POINTS .................................................................................................... 29
PROGRAMMING THE EXTERNAL TEMPERATURE ALARM STATUS ....... 30
PROGRAMMING THE SENSOR GROUP NUMBER..................................... 30
PROGRAMMING THE EXTERNAL TEMPERATURE SENSOR INSTALLATION
STATUS .................................................................................................... 31
Page 2
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LBW-420 and LBW-420-1 Ammonia Leak Detectors
PROGRAMMING THE AMMONIA LEVEL 4-20 MA RANGE ..................... 32
AMMONIA LEAK INDICATION ................................................................ 34
MESSAGE CODES .................................................................................... 35
4-20 MA ERROR INDICATION .................................................................. 35
TEST AND CALIBRATION .................................................................... 37
TESTING THE DETECTOR ....................................................................... 37
CALIBRATING THE DETECTOR............................................................... 38
TECHNICAL SUPPORT .......................................................................... 40
WARRANTY.............................................................................................. 41
LBW-420 SPECIFICATIONS .................................................................. 42
Page 3
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
IMPORTANT—READ THIS FIRST
PLEASE READ AND UNDERSTAND THIS SECTION BEFORE
INSTALLING AND OPERATING THE LBW-420 DETECTOR
CAUTION:
Operating the detector in lower temperatures will slow the detector response
rate, and high humidity or excessive heat can cause the “Minimal
Concentration” LED to light.
After applying power, test the detector to ensure it is operating correctly. Be
sure the detector has been powered for at least 8 hours before testing.
If storing this manual in the detector enclosure, be sure not to lay it flat over
the circuit boards, as this might result in damage to components from
excessive heat. Fold the manual and store it in the space between the
enclosure-mounted circuit board and the enclosure wall.
Adequately cover the detector sensor during washdown, and avoid spraying
the washdown liquid directly onto the sensor.
Avoiding Nuisance Alarms
To avoid nuisance alarms, place the detector in service mode before:

Programming set points, external temperature alarm status, and
external temperature sensor installation status.

Performing maintenance, repairs, testing, or calibration.

Performing maintenance on nearby compressor systems.

Painting nearby.

Performing refrigeration system maintenance.

Washing down the area.

Removing the ammonia or temperature sensor.
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Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Furthermore, be sure of the following before placing the detector in normal
operating mode:

The ammonia concentration reading is below the pre-alarm set
point.

The temperature reading is between the high and low temperature
set points (if an external temperature sensor is in use).
A nuisance alarm will also occur if the external temperature sensor
installation status is programmed to “F In” (installed) and an external
temperature sensor is not installed.
It is suggested that the high temperature set point be programmed above the
normal operating temperature to avoid nuisance alarms.
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Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
INTRODUCTION
The Cool Air Incorporated LBW-420 is an AC powered state-of-the-art
ammonia leak detector that detects and displays ammonia concentrations of
25 to 1000 parts per million (PPM). It comes equipped with a solid-state,
long-life ammonia sensor that has a quick and accurate response to ammonia
concentrations.
The Cool Air Incorporated LBW-420-1 is a DC powered version of the
LBW-420 ammonia leak detector (AC powered detector). The LBW420-1
incorporates a fully isolated DC to DC power supply, allowing the LBW420-1 to be powered from the same DC supply as the 4-20 mA monitoring
circuits without concern for ground isolation.
The LBW-420-1 requires a DC supply voltage between 21.6 and 26.4 volts
DC +/- 10%.
The LBW-420-1 can be configured to supply power to the 4-20 mA
circuit(s) or can operate as a fully isolated 4-20 mA sensor. Refer to 4–20
mA Analog Outputs for more details.
STANDARD FEATURES
Both the LBW-420 and the LBW-420-1 come with these additional standard
features:





Programmable Alarm and Pre-Alarm (Early Warning) set points.
Two 4-20 mA analog output signals, for ammonia level and
external temperature, which can communicate directly with
computer systems such as PLC’s.
Normally-open, normally-closed contacts for communicating with
common industry alarm systems.
A NEMA 4X, UL-listed enclosure.
Spare contacts for operating auxiliary equipment such as exhaust
fans, king valves, compressors, and additional alarm systems.
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
AVAILABLE OPTIONS
In addition to the standard features, the LBW-420 and LBW-420-1 can be
equipped with these options:

A remote ammonia sensor with cable allowing the sensor to be
located a maximum of 500 feet away from the detector.

A high-low external temperature sensor with cable and
programmable alarm set points for refrigeration or freezer
applications. This sensor must be installed and active for the
External Temperature 4-20mA signal to operate correctly.
An external back-up battery to keep the detector working during
loss of main power.
A stainless-steel washdown tube installed over the sensor so that it
does not get wet during washdown.
A remote alarm light and horn box with a toggle switch to
TEST/NORMAL/SILENCE the alarm.



Contact Cool Air Incorporated technical support for more detailed
information, or for purchasing, any of these options.
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Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
PARTS DESCRIPTION
Front Panel Display
The front panel display is comprised of a digital display and a series of
labeled indicating LED’s. The seven-segment, four-digit display indicates a
variety of information, such as ammonia concentration and external
temperature (if an external temperature sensor is in use), and more,
depending on the position of the rotary selector switch. Ammonia
concentration is displayed in parts per million (“P”) and temperature is
displayed in degrees Fahrenheit (“F”). The LED’s provide an indication of
ammonia concentration and alarm status at a glance.
For information on how the display indicates ammonia concentrations, see
the sections on ammonia leak indication
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Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
.
Ammonia Sensor
The detector comes with a solid-state, long-life sensor that has a high
sensitivity to amine compounds and a quick response to concentrations of
ammonia. The sensor is protected by a flame arrestor, and has an integral
heater and a ceramic base that is resistant to severe environments.
Each ammonia sensor has a specific sensor group number, and this number
must be programmed into the detector to detect and display ammonia
concentration accurately. The detector is programmed at the factory with the
correct sensor group number. The sensor group number can also be viewed
on the front panel digital display. See the section on the rotary selector
switch. However, if a new ammonia sensor is installed, the detector must be
reprogrammed with the new sensor group number and recalibrated. See the
section on programming the sensor group number.
Front Panel-Mounted Circuit Board
The front panel-mounted circuit board contains the controls necessary for
programming and operating the detector. Each control is described in detail
below. When the detector enclosure is open, this circuit board is on the left,
attached to the front panel.
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Service Switch (Service Mode)
The detector can be set to one of two modes: normal operating mode or
service mode. The detector is in normal operating mode when the service
switch is in the “OFF” position. When the service switch is in the “ON”
position, the detector continues to function as usual, however the alarm, prealarm, and auxiliary relays are disabled. This allows the detector to be
serviced, tested, and calibrated without tripping the alarm relays and setting
off nuisance alarms.
When the detector is in the service mode, the display will alternate between
the sensor reading in PPM and “SEr” (service switch “on”). This is done as
a reminder to set the switch back to “off” when service is done.
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LBW-420 and LBW-420-1 Ammonia Leak Detectors
The “ENTER”, “UP”, and “DOWN” Pushbuttons
The “UP” and “DOWN” buttons are used for setting the digital display to the
desired value, and the “ENTER” button is used for programming a value
previously set on the digital display. These buttons are used when
programming: the set points, the external temperature alarm status, the
external temperature sensor installation status, and the sensor group number.
They are also used during calibration of the detector.
Rotary Selector Switch
The rotary selector switch (labeled “MENU SELECT” on the front panelmounted circuit board) is used for performing functions such as:




Setting the information displayed on the front panel
Programming set points
Displaying system information
Calibrating the detector
When the detector is in operation, this switch is typically set to position “0”
to continuously display ammonia concentration, or to position “1” to display
ammonia concentration and an external temperature (if an external
temperature sensor is in use). If the switch is set to position “1”, the display
will alternate between ammonia concentration and external temperature.
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Use the following chart to select the switch position for the desired function:
Set the Rotary
To:
Selector Switch to:
Display ammonia concentration in PPM
0
Display ammonia concentration in PPM and
external temperature in °F (if an external
1
temperature sensor is in use)
Display the firmware revision
2
Program the ammonia alarm set point
3
Program the ammonia pre-alarm set point
4
Program the external temperature alarm
5
status to “F AL” (active) or “F --” (inactive)
Program the high temperature alarm set point
6
Program the low temperature alarm set point
7
Display the sensor group number
8
Display the offset (V50)
9
Note: If the rotary selector switch is left in a position other than “0” or “1”
for more than 5 minutes, the digital display will begin to display ammonia
concentration. If this happens, return the selector switch to the “0” position,
then set the switch to the desired position. For example, if you set the rotary
selector switch to position “3” to program the alarm set point, and if, after 5
minutes of inactivity the display reverts to displaying ammonia
concentration, move the switch to “0”, then back to “3” to continue
programming the alarm set point.
Caution: Before closing the detector enclosure, be sure to return the
rotary selector switch to position “0” or “1” to correctly
display ammonia concentration, or ammonia concentration
and external temperature.
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Additional functions are available through the rotary selector switch when
the jumper (labeled “SET1”), located below the rotary selector switch on the
front panel-mounted circuit board, is installed:
To:
Display ammonia sensor temperature
Program the ammonia sensor Range
Program the external temperature sensor
installation status to “F In” (installed) or “F --”
(not installed)
Program the sensor group number
Calibrate the detector
Set the Rotary
Selector Switch to:
1
3
5
8
9
Enclosure-Mounted Circuit Board
The enclosure-mounted circuit boards differ between the LBW-420 and the
LBW-420-1 to accommodate the differing Power connections. All other
connections are identical. The Enclosure Mounted Circuit board contains
the relays, output contacts and termination points for connecting to external
equipment. When the detector enclosure is open, this circuit board is on the
rear wall of the enclosure. The enclosure-mounted circuit board is shown in
the following two pictures and described in detail below.
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Power (LBW-420)
WARNING: RISK OF ELECTRIC SHOCK. DO NOT
REMOVE COVER. NO USER SERVICEABLE
PARTS INSIDE. REFER TO QUALIFIED SERVICE
PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE. NE PAS
ENLEVER LE COUVERCLE. AUCUN ENTRETIEN
DE PIECES INTERIEURES PAR L'USAGER.
CONFIER L'ENTRETIEN AU PERSONNEL
QUALIFIE.
Power for the LBW-420 must be a nominal 115 Volt AC circuit. Power is
connected to terminal block J2. A safety ground terminal is also provided on
terminal block J2.
Page 14
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Power (LBW-420-1)
Power for the LBW-420-1 must be a DC voltage between 21.6 and 26.4
volts with a current rating of at least 0.5 amps at 24 volts. Power is
connected to terminal block J2.
Jumper J3, Ammonia signal (LBW-420-1 only)
Jumper J3 (ammonia signal) configures the LBW-420-1 to use either an
external power supply for the Ammonia 4-20 mA circuit or to use an on
board 30 volt DC supply for the 4-20 mA circuits.
With the jumper in the leftmost position, connecting pins 2 to 3 (as shown in
the picture) 4-20 mA power is supplied by the on-board supply.
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
With the jumper(s) in the rightmost position, connecting pins 2 to 1
(opposite of picture) 4-20 mA power must be supplied by an external supply.
Jumper J4, Temperature signal (LBW-420-1 only)
Jumper J4 (temperature signal) configure the LBW-420-1 to use either an
external power supply for the Temperature 4-20 mA circuit or to use an on
board 30 volt DC supply for the 4-20 mA circuits.
With the jumper in the leftmost position, connecting pins 2 to 3 (as shown in
the picture) 4-20 mA power is supplied by the on-board supply.
With the jumper in the rightmost position, connecting pins 2 to 1 (opposite
of picture) 4-20 mA power must be supplied by an external supply.
Jumpers Required
Jumpers J3 and J4 must be installed in either position. If the jumper(s) are
removed, the 4-20 mA circuit(s) will not function.
Relays
The detector has three miniature printed circuit board relays: the alarm, prealarm (early warning), and the auxiliary relays. The auxiliary relay operates
at the same time as the alarm relay. In the normal operating mode, the relays
are energized in a normally-open state. If a loss of power to the detector
occurs, the relays will de-energize and the alarms, if connected, will sound.
Relay Status LEDs
Each relay has a surface-mounted LED associated with it that indicates the
status of the relay. A relay is energized (a non-alarm condition) when its
LED is lighted (green), and de-energized (an alarm condition) when the LED
is not lighted.
Page 16
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
External Connections
Contacts for external connections:
 4–20 mA outputs for ammonia level and external temperature
 Auxiliary Relay contacts
 External temperature sensor input
 Alarm Relay contacts
 Pre-alarm Relay contacts (early warning)
 LBW-420 AC Power
 LBW-420-1 DC Power
4–20 mA Analog Outputs
The detector has a two 4-20 mA analog outputs that allow it to communicate
with external devices such as computers, PLCs, and digital displays. Both
outputs conform to ISA S50.01 ratings, Type 2L and Type 2H (two-wire).
The ammonia level detector output current (TB2, “Sensor 4-20mA”
terminals on lower left of Enclosure Mounted Circuit Board) is proportional
to ammonia PPM with the proportionality constant dependent on the range.
The PPM value can be determined using one of the following formulae:
PPM = 62.5 (I – 4)
PPM = 50 (I – 4)
PPM = 31.25 (I – 4)
PPM = 25 (I – 4)
PPM = 15.67 (I – 4)
PPM = 6.25 (I – 4)
0 to 1000 PPM Range
0 to 800 PPM Range
0 to 500 PPM Range
0 to 400 PPM Range
0 to 250 PPM Range
0 to 100 PPM Range
Where PPM equals ammonia concentration in parts per million and I equals
the output current in mA. For example, if the current is 4 mA, then the
ammonia concentration is 0 PPM. If the current is 20 mA, then the ammonia
concentration is 100 PPM (100 PPM range), 250 PPM (250 PPM range), 400
PPM (400 PPM range), 500 PPM (500 PPM range), 800 PPM (800 PPM
range) or 1000 PPM (1000 PPM range),.
Page 17
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Wiring Diagram: LBW-420
For the LBW-420, the 4-20 mA output is a simple series circuit that includes
the detector, a 24 VDC power supply, and the receiving device. It is
recommended that a 24 VDC, low-noise power supply be used for this
application, although power supplies providing a minimum of 10 VDC to a
maximum 30 VDC can be used. The voltage drop across the detector and
the receiver together must not exceed the power supply voltage. This circuit
is shown in Figure 1 below:
Figure 1.
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Wiring Diagram: LBW-420-1 with (1) – 24 VDC Power Supply
For this configuration, with the jumper J3 in the leftmost position (which
connects pins 2 & 3), power for the 4-20 mA circuit is provided by the
LBW-420-1. This circuit is shown below. The power supply must supply
all power for the LBW-420-1 plus the 4-20 mA circuit. Refer to the
specifications page for the power requirements for the LBW-420-1. The
voltage drop across the detector and the receiver together must not exceed
the power supply voltage. This circuit is shown in figure 2 below:
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Wiring Diagram: LBW-420-1 with (2) – 24 VDC Power Supplies
In this configuration, with the jumper J3 in the rightmost position (which
connects pins 1 & 2), power for the LBW-420-1 is supplied by the 24 VDC
power supply #1 only. The power supply must supply all power for the
LBW-420-1. Refer to the specifications page for the power requirements for
the LBW-420-1. The power for the 4-20 mA circuit is supplied by the 24
VDC power supply #2. The 4-20 mA circuit is a simple series circuit that
includes the LBW detector, a power supply, and the receiving device. It is
recommended that a 24 VDC low-noise power supply be used for this
application, although power supplies providing a minimum of 10 VDC to a
maximum 30 VDC can be used. The voltage drop across the detector and
the receiver together must not exceed the power supply voltage. This circuit
is shown in Figure 3 below:
Page 20
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
For both the LBW-420 and the LBW-420-1, the maximum allowable
resistance in the receiving device must not exceed Rmax using this formula:
Rmax = 50 (Vs – 7.5)
where Vs is the supply voltage in volts DC for the 4-20 mA circuit. For
example, with a supply voltage of 24 VDC, the maximum allowable
resistance is 825 Ω.
The External Temperature output current (if equipped) is located on TB3
“Spare” terminals on lower left of Enclosure Mounted Circuit Board and is
proportional to the External Temperature with the proportionality constant
dependent on temperature units (degrees F or degrees C). The External
Temperature can be determined using the following formula:
For units programmed in degrees F:
Temperature = 10 (I – 4) – 50
-50F to +110F Range
For units programmed in degrees C:
Temperature = 5 (I – 4) – 50
-40C to +40C Range
where I equals the output current in mA. For example, if the unit is
programmed in degrees F and the output current is 12 mA, then the
temperature is 30 degrees F. If the current is 4 mA, the temperature is -50F,
and if the current is 20 mA, the temperature is +110 degrees F.
Note that an optional External Temperature Sensor must be installed and
External Temperature sensing must be active (see Programming the
External Temperature Sensor Installation Status).
INSTALLATION AND SETUP
Caution: Do not apply power to the detector until instructed to do so.
The detector comes with four mounting feet, packaged in the detector
enclosure for shipment. Use the directions that accompany the mounting
feet for mounting the detector enclosure.
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
The detector should be mounted in a location where ammonia leaks are most
likely to occur, such as near valve groups, compressors, and refrigeration
coils. Be sure the detector is visible and easily accessible. Avoid locating
the detector where it might be damaged during washdown. It is important
not to install the detector (specifically the sensor) in designated smoking
areas, as even a minute concentration of smoke will set off the alarm.
WARNING: RISK OF ELECTRIC SHOCK. DO NOT
REMOVE COVER. NO USER SERVICEABLE
PARTS INSIDE. REFER TO QUALIFIED SERVICE
PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE. NE PAS
ENLEVER LE COUVERCLE. AUCUN ENTRETIEN
DE PIECES INTERIEURES PAR L'USAGER.
CONFIER L'ENTRETIEN AU PERSONNEL
QUALIFIE.
The detector is set at the factory to operate on 115 VAC. When power is
applied to the detector, it will immediately go into alarm status and the
display will show an unusually large ammonia concentration. This is
normal. When the sensor warms to normal operating temperature (usually
about a minute) the detector will return to a non-alarm status. For this
reason, the detector must be placed in service mode before applying
power to the detector to avoid nuisance alarms.
The detector is calibrated and programmed at the factory. To program the
detector for its specific installation, follow these steps in the order given:
WARNING: RISK OF ELECTRIC SHOCK. DO NOT
REMOVE COVER. NO USER SERVICEABLE
PARTS INSIDE. REFER TO QUALIFIED SERVICE
PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE. NE PAS
ENLEVER LE COUVERCLE. AUCUN ENTRETIEN
DE PIECES INTERIEURES PAR L'USAGER.
CONFIER L'ENTRETIEN AU PERSONNEL
QUALIFIE.
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LBW-420 and LBW-420-1 Ammonia Leak Detectors
1.
2.
3.
4.
5.
6.
7.
8.
9.
Open the detector enclosure and place the detector in service mode by
sliding the service switch to the “ON” position.
Apply power to the detector and allow the sensor to warm to normal
operating temperature (at normal operating temperature, the display will
read “0P” and all LEDs will be unlit).
Program the ammonia pre-alarm (early warning) and alarm set points.
See the next section on programming the ammonia pre-alarm and alarm
set points.
Program the external temperature alarm set points (if an external
temperature sensor is installed). See the next section on programming
the high and low external temperature set points.
Program the external temperature sensor installation status to “installed”
or “not installed”, depending on whether an external temperature sensor
is installed. See the next section on programming the external
temperature sensor installation status.
Program the external temperature alarm status to “active” or “inactive”,
depending on whether an external temperature alarm system is in use.
See the next section on programming the external temperature alarm
status.
Set the detector to the desired operating display mode (typically “0” or
“1”). See the next section on setting the display mode.
Be sure the displayed ammonia concentration is below the programmed
pre-alarm set point. If an external temperature sensor is installed, be
sure the displayed temperature reading is within the programmed set
points. Return the detector to normal operating mode by sliding the
service switch to the “OFF” position.
Test the detector to ensure it is operating correctly (but allow at least 8
hours after power is first applied to the detector before testing). See the
section on testing the detector.
LBW-420 or LBW-420-1 Example Application
This schematic on the next page illustrates an example application.
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LBW-420 and LBW-420-1 Ammonia Leak Detectors
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Remote Sensing
Remote Sensing allows the ammonia sensor to be located remotely from the
LBW-420.
WARNING: FAILURE TO DISCONNECET POWER FROM THE
LBW-420 COULD RESULT IN DAMAGE TO THE DETECTOR.
This wiring diagram shows the connections from the LBW-420 to the
Remote Sensor. All connections to the Remote Sensor are made at the
LBW-420 TB7 on the Front Panel Circuit Board using 6 conductor shielded
cable. Note specifically that the RED WIRE CONNECTS TO THE REM
TERMINAL AND DOES NOT CONNECT TO THE “RED” TERMINAL.
Also the shield and or drain conductor connect to the SHIELD terminal on
the LBW-420 but do not connect to the Remote Sensor.
The Remote Sensor device is pictured next to the wiring diagram.
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Remote Alarm Installation
Remote Alarm replicates the audible and visible alarms of the LBW-420 at a
remote location.
This wiring diagram shows the connections from the LBW-420 to the
Remote Alarm. Power for the Remote Alarm is derived from LBW-420
TB7 on the Front Panel Circuit Board. An alarm signal is derived from the
LBW-420 enclosure-mounted circuit board.
The Remote Alarm device is pictured next to the wiring diagram.
Page 26
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Backup Battery Testing, Installation and Replacement
The LBW420 or the LBW420-1 can be supplied with an optional Backup
Battery from Cool Air Incorporated. This backup supply is good for
approximately 1 ½ hours of operating time. During normal operation, the
backup battery is not used but is kept trickle charged. In the event of a
power failure, the unit will seamlessly operate off of the back-up battery.
To test an existing or new battery, simple disconnect the leak detector power
supply. The unit should stay in normal operation ad not turn off. If the unit
turns off, check to make sure that the red and black wires are secure on the
battery terminals and the circuit board terminals. If the wiring is good, the
battery needs to be replaced.
If the back-up battery needs to be replaced because it has either failed, or
will not keep a charge, a new back-up battery can be ordered through your
local leak detector supplier or directly from Cool Air incorporated. Prior to
removing the old battery, disconnect the leak detector power supply, remove
the black and red wires from the battery terminals, cut the wire cable strap
(used primarily for shipping), and remove the battery from the Velcro
mounting pad. Install the new battery onto the Velcro mount pad, remove
the battery protector caps, plug the black wire into the black terminal, plug
the red wire to the red terminal, and reconnect the leak detector power
supply. Allow 24 hours of leak detector operation time before testing the
new battery.
PROGRAMMING AND OPERATION
The LBW-420 and LBW-420-1 detector is easy to program and operate.
Follow the instructions in this section to:






Set the display mode
Program the ammonia alarm set points
Program the external temperature high and low set points
Program the external temperature alarm status
Program the sensor group number
Program the external temperature sensor installation status
This section also describes the operation of the front panel indication system.
Page 27
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Setting the Desired Display Mode
During normal operation, the rotary selector switch is typically set to
position “0” or “1”. Set the switch to “0” to display ammonia concentration
only, or to “1” to display ammonia concentration and external temperature
(if an external temperature sensor is in use). If the rotary selector switch is
set to “1”, the front panel digital display will alternate between ammonia
concentration in PPM and external temperature in °F.
Programming the Ammonia Alarm and Pre-Alarm Set Points
The ammonia alarm and pre-alarm set points can be programmed from 25 to
800 PPM. To program the set points, follow these steps:
WARNING: RISK OF ELECTRIC SHOCK. DO NOT
REMOVE COVER. NO USER SERVICEABLE
PARTS INSIDE. REFER TO QUALIFIED SERVICE
PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE. NE PAS
ENLEVER LE COUVERCLE. AUCUN ENTRETIEN
DE PIECES INTERIEURES PAR L'USAGER.
CONFIER L'ENTRETIEN AU PERSONNEL
QUALIFIE.
1.
2.
3.
4.
5.
6.
Open the detector enclosure and slide the service switch to the “ON”
position.
Set the rotary selector switch to position “3” (to program the ammonia
alarm set point) or “4” (to program the ammonia pre-alarm set point).
Press the “UP” or “DOWN” button until the desired set point
concentration in PPM is displayed.
Press and hold the “ENTER” button for at least 2 seconds. The new set
point is now programmed.
Return the rotary selector switch to the desired position.
Be sure the ammonia concentration reading is below the pre-alarm
set point, then slide the service switch to the “OFF” position and close
the detector enclosure.
Page 28
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Programming the High and Low External Temperature Set
Points
If the detector has an external temperature sensor, the high and low external
temperature alarm set points can be programmed from -50°F to 110°F. For
freezer applications, the set points are typically programmed to temperatures
below 32°F, and for refrigeration applications, the set points are typically
programmed to temperature above 32°F. It is suggested that the high
external temperature set point be programmed above the normal operating
temperature to avoid nuisance alarms.
To program the high and low external temperature set points, follow these
steps:
WARNING: RISK OF ELECTRIC SHOCK. DO NOT
REMOVE COVER. NO USER SERVICEABLE
PARTS INSIDE. REFER TO QUALIFIED SERVICE
PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE. NE PAS
ENLEVER LE COUVERCLE. AUCUN ENTRETIEN
DE PIECES INTERIEURES PAR L'USAGER.
CONFIER L'ENTRETIEN AU PERSONNEL
QUALIFIE.
1.
2.
3.
4.
5.
6.
Open the detector enclosure and slide the service switch to the “ON”
position.
Set the rotary selector switch to position “6” (to program the high
external temperature set point) or “7” (to program the low external
temperature set point).
Press the “UP” or “DOWN” button until the desired set point
temperature in °F is displayed.
Press and hold the “ENTER” button for at least 2 seconds. The new set
point is now programmed.
Return the rotary selector switch to the desired position.
Be sure the external temperature reading is between the high and
low temperature set points, then slide the service switch to the “OFF”
position and close the detector enclosure.
Page 29
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Programming the External Temperature Alarm Status
The external temperature alarm status can be programmed to “active” or
“inactive”, depending on whether an external temperature alarm system is in
use. Follow these steps to program the external temperature alarm status:
WARNING: RISK OF ELECTRIC SHOCK. DO NOT
REMOVE COVER. NO USER SERVICEABLE
PARTS INSIDE. REFER TO QUALIFIED SERVICE
PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE. NE PAS
ENLEVER LE COUVERCLE. AUCUN ENTRETIEN
DE PIECES INTERIEURES PAR L'USAGER.
CONFIER L'ENTRETIEN AU PERSONNEL
QUALIFIE.
1.
2.
3.
4.
5.
6.
Open the detector enclosure and slide the service switch to the “ON”
position.
Set the rotary selector switch to position “5”.
Press the “UP” or “DOWN” button until the display reads “F AL”
(alarm active) or “F --” (alarm inactive).
Press and hold the “ENTER” button for at least 2 seconds. The new
external temperature alarm status is now programmed.
Return the rotary selector switch to the desired position.
Be sure the external temperature reading is within the high and low
external temperature set points, then slide the service switch to the
“OFF” position and close the detector enclosure.
Programming the Sensor Group Number
Each ammonia sensor has a specific sensor group number, and this
number must be programmed into the detector to detect and display
ammonia concentration accurately. The detector is programmed at the
factory with the correct sensor group number, and the number is printed
on the inside of the detector enclosure. However, if a new ammonia
sensor is installed, the
Page 30
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
detector must be reprogrammed with the new sensor group number and
recalibrated.
Programming the sensor group number requires the use of the jumper. To
program the sensor group number, follow these steps:
WARNING: RISK OF ELECTRIC SHOCK. DO NOT
REMOVE COVER. NO USER SERVICEABLE
PARTS INSIDE. REFER TO QUALIFIED SERVICE
PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE. NE PAS
ENLEVER LE COUVERCLE. AUCUN ENTRETIEN
DE PIECES INTERIEURES PAR L'USAGER.
CONFIER L'ENTRETIEN AU PERSONNEL
QUALIFIE.
1.
2.
3.
4.
5.
6.
7.
Open the detector enclosure and slide the service switch to the “ON”
position.
Install the jumper on the jumper pins (labeled “SET1”) located below
the rotary switch on the front panel-mounted circuit board.
Set the rotary selector switch to position “8”.
Press the “UP” or “DOWN” button until the display shows the desired
sensor group number.
Press and hold the “ENTER” button for at least 2 seconds. The new
sensor group number is now programmed.
Remove the jumper and return the rotary selector switch to the desired
position.
Slide the service switch to the “OFF” position and close the detector
enclosure
Programming the External Temperature Sensor Installation
Status
Caution: A nuisance alarm will result if the external temperature
sensor installation status is programmed to “F In” (installed)
and an external temperature sensor is not installed.
Page 31
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
The external temperature sensor installation status can be programmed to “F
In” (installed) or “F --“ (not installed), depending on whether an external
temperature sensor is installed. Programming the installation status requires
the use of the jumper. To program the external temperature sensor
installation status, follow these steps:
WARNING: RISK OF ELECTRIC SHOCK. DO NOT
REMOVE COVER. NO USER SERVICEABLE
PARTS INSIDE. REFER TO QUALIFIED SERVICE
PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE. NE PAS
ENLEVER LE COUVERCLE. AUCUN ENTRETIEN
DE PIECES INTERIEURES PAR L'USAGER.
CONFIER L'ENTRETIEN AU PERSONNEL
QUALIFIE.
1.
2.
3.
4.
5.
6.
7.
Open the detector enclosure and slide the service switch to the “ON”
position.
Install the jumper on the jumper pins (labeled “SET1”) located below
the rotary switch on the front panel-mounted circuit board.
Set the rotary selector switch to position “5”.
Press the “UP” or “DOWN” button until the display reads “F In”
(installed) or “F --” (not installed).
Press and hold the “ENTER” button for at least 2 seconds. The new
external temperature sensor installation status is now programmed.
Remove the jumper and return the rotary selector switch to the desired
position.
Be sure the external temperature reading is within the high and low
temperature set points, then slide the service switch to the “OFF”
position and close the detector enclosure.
Programming the ammonia level 4-20 mA range
The ammonia level 4-20 mA signal can be scaled to one of six ranges, either
0-100 PPM, 0-250 PPM, , 0-400 PPM, 0-500 PPM, 0-800 PPM or 0-1000
PPM. The 0-400 PPM range is preferred for most applications since the
accuracy, resolution and stability of the PPM value indicated by the 4-20 mA
Page 32
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
signal is better than on higher ranges and this range is compatible with
external equipment like the Cool Air DCSAP. Use the other ranges if there
is reason to measure ammonia concentrations other than 400 PPM. To
program the 4-20 mA range, follow these steps:
WARNING: RISK OF ELECTRIC SHOCK. DO NOT
REMOVE COVER. NO USER SERVICEABLE
PARTS INSIDE. REFER TO QUALIFIED SERVICE
PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE. NE PAS
ENLEVER LE COUVERCLE. AUCUN ENTRETIEN
DE PIECES INTERIEURES PAR L'USAGER.
CONFIER L'ENTRETIEN AU PERSONNEL
QUALIFIE.
1.
2.
3.
4.
5.
6.
7.
Open the detector enclosure and slide the service switch to the
“ON” position.
Install the jumper on the jumper pins (labeled “SET1”) located
below the rotary switch on the front panel-mounted circuit board.
Set the rotary selector switch to position “3”. The display will
indicate the current range, either “r100”, “r250”, “r400”, “r500”,
“r800” or “r1E3” (1000 PPM range).
Press the “UP” or “DOWN” button until the display indicates the
desired range.
Press and hold the “ENTER” button for at least 2 seconds. The new
range is now programmed.
Remove the jumper and return the rotary selector switch to the
desired position.
Slide the service switch to the “OFF” position and close the detector
enclosure.
Page 33
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Ammonia Leak Indication
◄ INCREASING ◄ CONCENTRATION ◄
In the event of a higher-than-normal ammonia concentration, the front-panel
LEDs will indicate as follows:
If the Ammonia
Concentration…
Then the…
And…
Equals or exceeds
25 PPM
Red “Minimal
Concentration” LED lights
No other actions
occur
Equals or exceeds
the pre-alarm set
point
Yellow “Early Warning”
LED lights
The pre-alarm
relay trips
Continues to
increase above the
pre-alarm set point
First red “Progressive
Contamination” LED
lights
No other actions
occur
Equals or exceeds
the alarm set point
Second red “Progressive
Contamination” LED
lights and the red “Alarm”
LED flashes
The alarm and
auxiliary relays
trip
After an alarm, the alarm and auxiliary relays will automatically reset when
the ammonia concentration falls below the alarm set point, and the pre-alarm
relay will automatically reset when the ammonia concentration falls below
the pre-alarm set point.
Page 34
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Error Codes
In the event of a detector error, one of these error codes will be displayed on
the front panel digital display:
Error Code
Err1
Err2
Err3
Description
Zero or low ammonia sensor heater current
Loss of AC power
High or low ammonia sensor resistance
Err4
Err5
Ammonia sensor temperature sensor fault
External temperature sensor fault
Contact Cool Air Incorporated technical support if any one of these error
codes is displayed.
Message Codes
Under certain alarm conditions, the detector will display messages. These
messages include:
Message Code
HiT
LoT
Description
High external temperature alarm
Low external temperature alarm
If any one of these message codes is displayed, check the temperature where
the external temperature sensor is located to find the source of the alarm.
If the service switch if in the “on” position, the display message
shows:
Message Code
SEr
Description
Service switch “on”
This is a reminder to turn the service switch off so the unit is in the
normal operating mode.
Page 35
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
4-20 mA Error Indication
Any error condition will cause the ammonia level 4-20 mA signal to
go to near zero indicating a fault. Temperature faults will cause the
External Temperature 4-20 mA signal to go to near zero.
Page 36
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
TEST AND CALIBRATION
Be sure to follow all codes and company procedures that pertain to the
maintenance, repair, testing, and calibration of all safety equipment,
including this detector. At a minimum, the detector must be tested after
installation (allow at least 8 hours after first applying power to the detector),
and at least once a month thereafter to ensure it is operating correctly. Also,
the detector must be calibrated at least once a year to ensure it is detecting
and displaying ammonia concentration accurately.
At the time of calibration, it is highly recommended to use a new test bottle
of ammonia that can be purchased from Cool Air Inc. or their distributors.
The detector is initially calibrated and programmed at the factory. However,
if a new ammonia sensor is installed, the detector must be reprogrammed
with the new sensor group number and recalibrated.
All tests and calibrations must be recorded on an appropriate log sheet.
Not installing, maintaining, testing, or calibrating the detector according
to the schedules and procedures in this manual will automatically void
the warranty.
Testing the Detector
To test the detector, follow these steps:
WARNING: RISK OF ELECTRIC SHOCK. DO NOT
REMOVE COVER. NO USER SERVICEABLE
PARTS INSIDE. REFER TO QUALIFIED SERVICE
PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE. NE PAS
ENLEVER LE COUVERCLE. AUCUN ENTRETIEN
DE PIECES INTERIEURES PAR L'USAGER.
CONFIER L'ENTRETIEN AU PERSONNEL
QUALIFIE.
1.
Open the detector enclosure and slide the service switch to the “ON”
position, if needed. This step deactivates the Early Warning, Alarm, and
Page 37
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
2.
3.
Auxiliary relays so that any attached strobe lights, horns, and/or
monitoring systems are not activated. In some applications, if alarming
is required, leave the service switch in the “OFF” position.
Hold a sample bottle of ammonia of concentration over the sensor.
Check the following:

LEDs on the front display panel light up from the bottom to the
top.

Digital display shows an increasing concentration of ammonia
in PPM.

4.
5.
4-20 mA output signal shows an increasing value that
corresponds to the digital display.
Remove the ammonia sample.
Wait until the ammonia concentration reading is below the prealarm set point, then slide the service switch to the “OFF” position and
close the detector enclosure. Remember, this step is only required if the
service switch was turned to the “ON” position in step # 1 above.
Testing is now complete.
Calibrating the Detector
Follow these instructions to calibrate the detector:
1.
Find the sensor group number associated with the installed sensor. The
sensor group number is a number from 1 to 6, followed by a dash and a
letter, from A to C. An example sensor group number is 3-C.
WARNING: RISK OF ELECTRIC SHOCK. DO NOT
REMOVE COVER. NO USER SERVICEABLE
PARTS INSIDE. REFER TO QUALIFIED SERVICE
PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE. NE PAS
ENLEVER LE COUVERCLE. AUCUN ENTRETIEN
DE PIECES INTERIEURES PAR L'USAGER.
CONFIER L'ENTRETIEN AU PERSONNEL
QUALIFIE.
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Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Open the detector enclosure and slide the service switch to the “ON”
position, if needed. This step deactivates the Early Warning, Alarm,
and Auxiliary relays so that any attached strobe lights, horns, and/or
monitoring systems are not activated. In some applications, if alarming
is required, leave the service switch in the “OFF” position.
3. Install the jumper on the jumper pins (labeled “SET1”) located below
the rotary selector switch on the front panel-mounted circuit board.
4. Turn the rotary selector switch to position “8”. Press the “UP” or
“DOWN” button until the correct sensor group number is displayed on
the front panel digital display.
5. Press and hold the “ENTER” button for at least 2 seconds.
6. Set the rotary selector switch to position “9”.
7. Take a sample bottle of known ammonia concentration and wipe clean
the inside and outside surface of its neck. Hold the bottle over the
sensor until a stable ammonia concentration reading is displayed.
It might take several minutes for the reading to stabilize.
8. Continue to hold the sample bottle over the sensor, and press the “UP”
or “DOWN” button until the display indicates the concentration of the
known sample. For example, if the sample ammonia concentration is
100 PPM, press the “UP” or “DOWN” button until the display
indicates 100 PPM.
9. Press and hold the “ENTER” button for at least 2 seconds.
10. Remove the sample bottle and the calibration jumper.
11. Wait until the ammonia concentration reading is below the prealarm set point, then set the rotary selector switch to the desired
position (typically “0” or “1”).
12. Slide the service switch to the “OFF” position and close the detector
enclosure. Remember, this step is only required if the service switch
was turned to the “ON” position in step # 2 above. Calibration is now
complete.
2.
Page 39
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
TECHNICAL SUPPORT
For technical support, contact Cool Air Incorporated using any of these
methods:
Contact:
Sales Representative
Phone:
(763) 205-0844 (USA)
Fax:
(763) 432-9295 (USA)
E-mail:
info@coolairinc.com
Web site:
www.coolairinc.com
Address:
Cool Air Incorporated
1544 134th Ave NE
Ham Lake, MN 55304
USA
Page 40
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
WARRANTY
The LBW-420 and LBW-420-1 come with a 36-month limited warranty
from the time of purchase.
Cool Air Incorporated guarantees that the LBW-420 or LBW-420-1
ammonia leak detector, when connected to and operated in accordance with
the instructions contained in this manual, will perform in accordance with
the warranty expressed on the cover of the detector. Not installing,
maintaining, repairing, or operating the detector in accordance with the
instructions in this manual will automatically void the warranty.
Cool Air Incorporated will not be held liable for any losses, liabilities,
judgments, attorney fees, claims, or damages, including incidental and
consequential damages.
THE DETECTOR MUST BE TESTED AT LEAST ONCE A MONTH
AND CALIBRATED AT LEAST ONCE A YEAR TO ENSURE IT IS
OPERATING ACCURATELY AND CORRECTLY. TEST AND
CALIBRATION RECORDS MUST BE RECORDED ON
APPROPRIATE LOG SHEETS.
Page 41
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
LBW-420 and LBW-420-1 SPECIFICATIONS
Ammonia Detection
Sensitivity
High & Low Temperature
Setpoint Range
25 to 1000 PPM
-50°F to 110°F
0.8”, 7-segment LED, 4-digit
Display
Controls
Ammonia Sensor
Relays
Outputs
Service mode switch
Enter, Up, and Down pushbuttons
Rotary selector switch
Jumper
Metal oxide semiconductor
833 mW integral heater
Alumina ceramic base
100 mesh SUS 316 double gauge flame
arrestor
Alarm, pre-alarm, and auxiliary (auxiliary
relay operates at same time as alarm relay)
Form C (SPDT), normally-open, normallyclosed, energized in normally-open state
Contact rating: 5A, 120 VAC or 24 VDC
Contacts for: alarm, pre-alarm, and auxiliary
relays, and external temperature sensor
4-20 mA DC, conforming to S50.01 ratings,
Type 2L and Type 2H
Operating Temperature
-50°F to 125°F
Operating Humidity
5% to 95% RH, non-condensing
Page 42
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
LBW-420
Power Requirements
115 VAC, 50/60 Hz
0.5 Amps max.
LBW-420-1
24 Volts DC, 21.6 – 26.4, +/- 10%
0.5 Amps max.
Dimensions
9½”H x 8”W x 4½”D
Weight
6 lbs.
Enclosure
NEMA 4X rated, UL listed
Pollution Degree
1
Tested to UL 61010-1:2004 R7.05
CAN/CSA-C22.2 61010-1:2004
Approvals
By TUV
Certificate no. CU72090607 01
Options
1. Remote ammonia sensor with box and cable
(500 ft. max.)
2. High-low external temperature (F or C)
sensor with cable and programmable alarm
set points
3. External back-up battery
4. Stainless steel washdown tube
5. Remote alarm light and horn unit with box,
cable, & TEST/NORMAL/SILENCE
toggle switch.
Page 43
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Page 44
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
LBW-420 and LBW-420-1 Ammonia Leak Detectors
Page 45
Rev. 8-1 7/28/2014
Copyright © 2003-14 by Cool Air Incorporated. All rights reserved.
1544 134th AVE NE, Ham Lake, MN 55304 USA
Phone (763) 205-0844 Fax (763) 432-9295
info@coolairinc.com
www.coolairinc.com