Cool Air LBW-420-LEL User Manual Download Page 27

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Rev. 2.1 7-7-2017

LBW-420-LEL and LBW-420-LEL SPECIFICATIONS

Ammonia Detection
Sensitivity

0 to 10%

Display

0.8”, 7-segment LED, 4-digit

Controls

Service mode jumper
Enter, Up, and Down pushbuttons
Rotary selector switch
Jumper

Ammonia Sensor

Ammonia gas sensing head

Relays

Alarm, pre-alarm, and Aux Form C (SPDT),

normally-open, normally-closed, energized
in normally-open state

Contact rating: 5A, 120 VAC or 24 VDC

Outputs

Contacts for: alarm, pre-alarm, and auxiliary

relays, 4-20 mA DC, conforming to S50.01
ratings, Type 2L and Type 2H

Operating Temperature

40°F to 110°F

Operating Humidity

5% to 95% RH, non-condensing

Power Requirements

LBW-420-LEL

24 Volts DC, 18 – 36, +/- 10%
0.25 Amps max.

Dimensions

9½”H x 8”W x 4½”D

Weight

6 lbs.

Enclosure

NEMA 4X rated, UL listed

Pollution Degree

Options

1. 100 to 240VAC to 24VDC power supply
2. Remote alarm light and horn unit with box,

cable, & TEST/NORMAL/SILENCE
toggle switch.

Summary of Contents for LBW-420-LEL

Page 1: ...Models LBW 420 LEL 24 VDC powered Ammonia Leak Detector ...

Page 2: ...roper 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 AUTHORIZED DISTRIBUTOR GasDetectorsUSA com Houston Texas USA sales GasDetectorsUSA com 832 615...

Page 3: ...CIRCUIT BOARD 10 POWER CONNECTIONS 10 J3 SETTINGS 10 RELAYS 11 RELAY STATUS LEDS 12 EXTERNAL CONNECTIONS 12 4 20 mA Analog Output 12 4 to 20mA WIRING 13 Wiring Diagram LBW 420 LEL 3 wire 24 VDC Power Supply 13 Wiring Diagram LBW 420 LEL 4 wire 24 VDC Power Supply 14 INSTALLATION AND SETUP 15 REMOTE ALARM LIGHT AND HORN UNIT 17 PROGRAMMING AND OPERATION 18 PROGRAMMING THE AMMONIA ALARM SET POINTS 1...

Page 4: ...d for at least 10 minutes before testing 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 Avoiding unwanted Alarms or shutdowns To avoid nuisance alarms place the detector in service mode before Programming the alarm set p...

Page 5: ...tween 18 and 36 volts DC The LBW 420 LEL 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 The Cool Air Incorporated LBW 420 LEL can be optionally equipped with an AC to DC converter to allow operating the detector with 100 to 240VAC input Once the detector senses ammonia at or above the ALA...

Page 6: ...Incorporated All rights reserved AVAILABLE OPTIONS 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 ...

Page 7: ...a concentration and more depending on the position of the rotary selector switch Ammonia concentration is displayed in percent ammonia The LED s provide an indication of ammonia concentration and alarm status at a glance Alarm indication All Relays will be active when this is on Alarm disabled indication All relays will be deactivated when this LED is on Two digit seven segment display In normal o...

Page 8: ...ith a quick response at levels above 1 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 NOTE The service switch may be a jumper instead of the switch ...

Page 9: ...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 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 ...

Page 10: ...y selector switch is left in a position other than 0 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...

Page 11: ...ut 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 picture and described in detail below Power LBW 420 LEL Power for the LBW 420 LEL must be a DC voltage between 18 and 30 volts with a current rating of at least 0 5 amps at 2...

Page 12: ...moved the 4 20 mA circuit s will not function Relays The detector has three miniature printed circuit board relays the alarm pre alarm early warning and the auxiliary relays 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 When relays have been activated by an ...

Page 13: ... that allows it to communicate with external devices such as computers PLCs and digital displays The output conforms 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 dete...

Page 14: ...hich connects pins 2 3 power for the 4 20 mA circuit is provided by the LBW 420 LEL This circuit is shown below The power supply must supply all power for the LBW 420 LELplus the 4 20 mA circuit Refer to the specifications page for the power requirements for the LBW 420 LEL The voltage drops across the detector and the receiver together must not exceed the power supply voltage This circuit is show...

Page 15: ...pecifications page for the power requirements for the LBW 420 LEL 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 ...

Page 16: ...sure 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 wash down When power is applied to the detector it will immediately go into alarm status and the display will show an unusually ...

Page 17: ... sensor to warm to normal operating temperature at normal operating temperature the display will read 0 and Alarm LED will be unlit 3 Program the ammonia Alarm set point See the next section on programming the ammonia alarm set point 4 Be sure the displayed ammonia concentration is below the programmed alarm set point return the detector to normal operating mode by moving the service jumper to the...

Page 18: ...rms of the LBW 420 LEL at a remote location This wiring diagram shows the connections from the LBW 420 LEL to the Remote Alarm Power for the Remote Alarm is derived from LBW 420 LEL TB7 on the Front Panel Circuit Board An alarm signal is derived from the LBW 420 LEL enclosure mounted circuit board The Remote Alarm device is pictured next to the wiring diagram ...

Page 19: ... new set point is now programmed 5 Return the rotary selector switch to the desired position 6 Be sure the ammonia concentration reading is below the alarm set point then move the service jumper to the OFF position and close the detector enclosure Resetting the Relays for use only when the ammonia concentration is below the alarm set point If the detector has gone into an alarm condition at or abo...

Page 20: ...w range is now programmed 6 Remove the jumper and return the rotary selector switch to the desired position 7 Move the service jumper to the OFF position and close the detector enclosure Setting the Service Mode Timeout If the service jumper is not returned to off you can change how long the detector stays in service mode before returning to normal operating mode With the SET jumper on and the Rot...

Page 21: ...s initially calibrated and programmed at the factory However if a new ammonia sensor is installed the detector must be recalibrated All tests and calibrations must be recorded 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 1 Open...

Page 22: ...n 5 Install the jumper on the jumper pins labeled SET1 located below the rotary selector switch on the front panel mounted circuit board 6 Set the rotary selector switch to position 9 7 Attach the calibration adaptor to the sensor and flow the calibration gas at no greater than 5Lpm until a stable ammonia concentration reading is displayed this should be no longer than 60 seconds 8 Press the UP or...

Page 23: ...ECHNICAL SUPPORT For technical support contact Cool Air Incorporated using any of these methods Contact Technical support 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 24: ...by CAI that the part s failed due to defective materials or workmanship The repair or replacement of any such defective part shall be CAI s sole and exclusive responsibility under this limited warranty 2 Inclusions A As of September 2 2014 the defined Product that is covered by this thirty six 36 month limited warranty is the LBW 50 LBW 420 LEL LBW RLV LBW 420 LBW WATCHMAN and DCSAP B If an ammoni...

Page 25: ... Limitation Inclusions Exclusions Cool Air Incorporated shall have no further obligation under this limited warranty All warranty obligations of Cool Air Incorporated are extinguishable if the Product has been subject to abuse misuse negligence or damage by accident or abnormal conditions of operation handling or use by the Purchaser or if the Purchaser fails to perform any duties set forth in thi...

Page 26: ...LL NOT EXCEED THE AMOUNT OF THE PURCHASE PRICE PAID BY THE PURCHASER FOR THE PRODUCT AND UNDER NO CIRCUMSTANCES SHALL COOL AIR INCORPORATED BE LIABLE FOR SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES THE PRICE STATED FOR THE PRODUCT IS A CONSIDERATION LIMITING COOL AIR INCORPORATEDS LIABILITY NO ACTION REGARDLESS OF FORM ARISING OUT OF THE TRANSACTIONS UNDER THIS WARRANTY MAY BE BROUGHT BY THE PURCHAS...

Page 27: ...lly open normally closed energized in normally open state Contact rating 5A 120 VAC or 24 VDC Outputs Contacts for alarm pre alarm and auxiliary relays 4 20 mA DC conforming to S50 01 ratings Type 2L and Type 2H Operating Temperature 40 F to 110 F Operating Humidity 5 to 95 RH non condensing Power Requirements LBW 420 LEL 24 Volts DC 18 36 10 0 25 Amps max Dimensions 9 H x 8 W x 4 D Weight 6 lbs E...

Page 28: ...P a g e 27 Rev 2 1 7 7 2017 Copyright 2017 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 ...

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