Cool Air LBW-420-EC User manual

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Electrochemical Sensor

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Rev. 11-5 12/15/2020
Copyright © 2020 by Cool Air Incorporated. All rights reserved.
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PROGRAMMING THE 4-20 MARANGE ................................................................ 21
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Rev. 11-5 12/15/2020
Copyright © 2020 by Cool Air Incorporated. All rights reserved.
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TE ES ST T A AN ND D C CA AL LI IB BR RA AT TI IO ON N...............................................................................24
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WHEN INSTALLING A NEW SENSOR .................................................................... 26
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WA AR RR RA AN NT TY Y.........................................................................................................29
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SP PE EC CI IF FI IC CA AT TI IO ON NS S
Ammonia Detection
Sensitivity 0 to 500 PPM
Display 0.8”, 7-segment LED, 4-digit
Controls
Service mode jumper
Enter, Up, and Down pushbuttons
Rotary selector switch
Jumper
Ammonia Sensor - Electrochemical
* High selectivity to NH3
* Small influence by H2S
* Excellent durability to NH3 exposure
* Linear output
* Long life
* Stable baseline
* Unique leak-proof structure
Relays
Alarm, pre-alarm, and auxiliary (see pairing aux relay)
Form C (SPDT), fail safe
Contact rating: 5A, 120 VAC or 24 VDC
Outputs 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 -10°F to 110°F
Operating Humidity 5% to 95% RH, non-condensing
Power Requirements
L
LB BW W- -4 42 20 0
L LB BW W- -4 42 20 0- -2 2
115VAC, 50/60 Hz 230VAC, 50/60 Hz
0.5 Amps max. 0.5 Amps max.
L
LB BW W- -4 42 20 0- -1 1
24Volts 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

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Rev. 11-5 12/15/2020
Copyright © 2020 by Cool Air Incorporated. All rights reserved.
Approvals
LBW-420 115VAC and
LBW-420-1 24VDC
Tested to UL 61010-1:2004 R7.05
CAN/CSA-C22.2 61010-1:2004
By TUV
Certificate no. CU72090607 01
Options
1. Remote ammonia sensor with box and cable (500 ft. max.)
2. Temperature (F) sensor with cable
3. External back-up battery
4. ABS washdown tube
5. Remote alarm light and horn unit with box, cable, & TEST/NORMAL/SILENCE toggle
switch.
I
IM MP PO OR RT TA AN NT T— —R RE EA AD D T TH HI IS S F FI IR RS ST T
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PL LE EA AS SE E R RE EA AD D A AN ND D U UN ND DE ER RS ST TA AN ND D T TH HI IS S S SE EC CT TI IO ON N
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BE EF FO OR RE E I IN NS ST TA AL LL LI IN NG G A AN ND D O OP PE ER RA AT TI IN NG G T TH HE E L LB BW W- -
4
42 20 0 D DE ET TE EC CT TO OR R. .
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No ot te e: : T Th hi is s
m ma an nu ua al l i is s s sp pe ec ci if fi ic c t to o a an nL LB BW W- -4 42 20 0 w wi it th h a an n
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El le ec ct tr ro oc ch he em mi ic ca al l s se en ns so or r i in ns st
ta al ll le ed d, , i it t i is s p po os ss si ib bl le e t to o d do o a a f fi ie el ld d
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co on nv ve er rs si io on n t to o a a S So ol li id d- -S St ta at te e S Se en
ns so or r. . C Co on nt ta ac ct t C Co oo ol l A Ai ir r
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In nc co or rp po or ra at te ed d s sa al le es s - - s sa al le es s@ @c co oo ol la ai ir ri in nc c. .c co om m o or
r 7 76 63 3- -2 20 05 5- -0 08 84 44 4 f fo or r
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mo or re e i in nf fo or rm ma at ti io on n. .
C
CA AU UT TI IO ON N: :
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.
After applying power, test the detector to ensure it is operating
correctly. Be sure the detector has been powered for at least 20
minutes before testing.

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Rev. 11-5 12/15/2020
Copyright © 2020 by Cool Air Incorporated. All rights reserved.
Do not store this manual inside the detector, as this
might result in damage to components from excessive
heat.
Adequately cover the detector sensor during washdown and avoid
spraying the washdown liquid directly onto the sensor. If necessary,
an ABS wash down tube is available from the factory.
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.
I
IN NT TR RO OD DU UC CT TI IO ON N
The Cool Air Incorporated LBW-420 Family of Detectors is a state-
of-the-art ammonia leak detector that detects and displays ammonia
concentrations of 0 to 500 parts per million (PPM) electrochemical
sensor or 0 to 1000 parts per million (PPM) solid state sensor.
The Cool Air Incorporated LBW-420-2 is a 230VAC powered
version of the LBW-420 ammonia leak detector (115VAC powered
detector). The LBW-420-2 requires an AC supply voltage between
200 and 240 volts AC.
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 LBW-420-1 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 18 and 36
volts DC.
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
4– –2 20 0 m mA A A An na al lo og g O Ou ut tp pu ut ts s f
fo or r m mo or re e d de et ta ai il ls s.
.

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Rev. 11-5 12/15/2020
Copyright © 2020 by Cool Air Incorporated. All rights reserved.
S
ST TA AN ND DA AR RD D F FE EA AT TU UR RE ES S
All LBW-420’s come with these additional standard features:
•Programmable Hi Alarm and Low-Alarm set points
•Selectable PPM reading start (0PPM or 25PPM)
•Selectable Service Mode timeout
•4-20 mA analog output signals, for ammonia 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. This relay can be set to operate as an
indication of an error only, error and active with low alarm
relay or error and active with alarm relay.
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.
•An external back-up battery to keep the detector working
during loss of main power.
•External Temperature Sensor (display only NO 4 to 20mA
output)
•An ABS wash-down tube installed over the sensor so that
it does not get wet during washdown.
•A remote alarm light and horn box with/or without 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. 11-5 12/15/2020
Copyright © 2020 by Cool Air Incorporated. All rights reserved.
P
PA AR RT TS S D DE ES SC CR RI IP PT TI IO ON N
F
Fr ro on nt t P Pa an ne el l D Di is sp pl la ay y
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
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.
Four-digit seven segment display.
In normal operating mode this will
display the ammonia concentration
in parts per million (PPM). It will
also be use in setting options and
calibration. Optionally it can display
temperature.
Low Alarm indication
Pre-Alarm Relay will be
active when this is on.
Hi Alarm indication
Alarm Relay will be active
when this is on.

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Rev. 11-5 12/15/2020
Copyright © 2020 by Cool Air Incorporated. All rights reserved.
A
Am mm mo on ni ia a S Se en ns so or r
The detector comes with an Electrochemical, long-life sensor that
has a high selectivity and a quick response to concentrations of
ammonia. The sensor is temperature compensated and is protected
by an inexpensive pre-filter that is easy to replace.
F
Fr ro on nt t P Pa an ne el l- -M Mo ou un nt te ed d C Ci ir rc cu ui it t B Bo oa ar rd d
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.
NOTE: The service switch may be a jumper instead of the switch.

Page | 8
Rev. 11-5 12/15/2020
Copyright © 2020 by Cool Air Incorporated. All rights reserved.
S
Se er rv vi ic ce e J Ju um mp pe er r ( (S Se er rv vi ic ce e M Mo od de e) )
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 jumper is in the “OFF” position. When the service
jumper is in the “ON” position, the detector continues to function as
usual, however the alarm, pre-alarm, and auxiliary relays are
disabled as well as the 4 to 20mA signal is set to 4ma (0PPM). 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 jumper
“on”). This is done as a reminder to set the jumper back to “off”
when service is done. If the service jumper is not returned to off, it
will automatically return to an as off state after a selected amount of
time. The factory default is 15 minutes.
See “Setting the Service Mode Timeout”
T
Th he e “ “E EN NT TE ER R” ”, , “ “U UP P” ”, , a an nd d “ “D
DO OW WN N” ” P Pu us sh hb bu ut tt to on ns s
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 sensor installation status, they are also used during
calibration of the detector.
R
Ro ot ta ar ry y S Se el le ec ct to or r S Sw wi it tc ch h
The rotary selector switch (labeled “MENU SELECT” on the front
panel-mounted 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