LPT-A-VLT Ammonia Vent Line Transmitter

For continuous monitoring of Ammonia levels in the vent line of refrigeration systems

Mount indoors on the ammonia vent relief stack above the pressure relief valve or mounted outside on the relief header above the roofline to help detect equipment failure

Applications

  • Ice Arenas
  • Refrigeration Plants
  • Cold Storage Rooms
  • Freezer Rooms
  • Ammonia Plants
  • and many more...

Key Features

  • Single channel, internal catalytic Ammonia sensor
  • Linear 4 - 20 mA analog or 0 - 10 volt output signal
  • LCD display
  • One 2A SPDT dry contact relay
  • Internal audible alarm
  • 3-wire VDC or 4-wire VAC power
  • 24 volt DC or AC power (nominal)
  • IP54 rated, water / dust tight, corrosion resistant enclosure with splash guard installed

Description

The LPT-A-VLT Ammonia Vent Line Transmitter is designed for continuous monitoring of ammonia levels in the vent line of refrigeration systems.  More specifically, it is designed for the detection of equipment failure in ammonia plant vent stack applications. Using the 3/4” cast steel coupler, it can be mounted indoors on the ammonia vent relief stack above the pressure relief valve or mounted outside on the relief header above the roofline. It can be configured to alarm at user specified concentration levels and send an analog signal to the controller or PLC to activate the emergency ventilation system or shut down the equipment depending on the level of alarm.

It offers 3-wire VDC or 4-wire VAC power, jumper selectable 4 - 20 mA or 0 - 10 VDC analog output, a standard dry contact relay (2 amps @ 30 volts SPDT), automatic thermal resetting fuse, temperature compensation, back lit LCD display and audible alarm, all in a RoHS compliant package. Comes standard with a water / dust tight, corrosion resistant ABS / polycarbonate enclosure with a hinged, secured door. Calibration and other maintenance procedures are simple and easily performed in the field.

NOTE: This device is not designed to monitor ammonia in applications requiring human health safety levels detection.

Target Gas
Gas Sensor
Ammonia (NH3), measurement range 0 - 3.00% volume
Sensor
Type
Catalytic NH3
Response Time T90
< 30 seconds
Mechanical
Enclosure
ABS / Polycarbonate, corrosion resistant
Copper coated interior to reduce RF interference
IP54 rated
Weight
825 g / 29 oz
Size
127 x 127 x 61 mm / 5.0 x 5.0 x 2.4 inches
Coupler
19.5 mm / 3/4 inch NPT, cast steel
Sensor Assembly length (including coupler)
98.5 mm / 3.875 inches
User Interface
Display
Graphic LCD, grey border
Magnetic switches to initiate calibration without opening the enclosure
Input/Output
Output
Linear 4 - 20 mA analog
Maximum 216 ohm load (wiring plus termination resistor) @ 12 VDC
Maximum 316 ohm load (wiring plus termination resistor) @ 12 VAC
Voltage 0 - 10 volt
Minimum 1k ohm load
Relay
1 SPDT dry contact, rated 30 Volts, 2 Amps max
Audible Alarm
Standard internal buzzer
Electrical
Power Requirement
3-wire mode: 16-30 VDC, 3 W, Class 2
4-wire mode: 12-27 VAC, 50-60 Hz, 3 VA, Class 2
Current Draw
125 mA @ 24VDC (max)
Wiring
VDC (or ground referenced AC): 3-conductor 16 AWG stranded, shielded
VAC: 4-conductor 16 AWG stranded, shielded
Fuses
Thermal, resetting
Environmental
Operating Temperature
-20°C to 40°C (-4°F to 104°F)
Operating Humidity
0 - 80% RH non-condensing
Certifications
Conforms to
CSA-C22.2 No. 205-12, UL508 (Edition 17):2007
EMC Directive 2004/108/EC, EN 50270:2006, Type 1, EN61010
FCC. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
RoHS compliant circuit boards
Product Codes
LPT-A-VLT-NH3-S
Catalytic ammonia (NH3) sensor (0 - 3.0% volume range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 V SPDT contact relay, audible alarm, water / dust tight enclosure rated IP54 with splash guard; power coated cast steel sensor assembly and coupler for mounting on ammonia vent relief stack

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