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PDC + LPT-A AMMONIA MONITORING SYSTEM
Cold Storage & Freezer Room Applications
Peace of mind. Guaranteed. Continuous monitoring of ammonia in a cold storage or freezer room. The food and beverage industry commonly relies on ammonia refrigeration to provide consumers high quality, edible food and drinks. An ammonia leak in a cold storage or freezer room can pose a serious health threat and result in spoiled food and other expensive losses. If a leak is detected, you want the peace of mind that comes with a properly installed ammonia monitoring system. Using Critical Environment Technologies Canada Inc. (CETCI)’s PDC Multi-Channel Controller and one or more LPT-A Analog Transmitters is the solution. The LPT-A transmitter(s) with an electrochemical ammonia sensor mounted inside the cold storage or freezer room provides continuous monitoring for leaks. The PDC Controller mounted outside the room door provides a status of the air quality conditions inside the room prior to entry. The PDC Controller has three levels of alarm and the sequence of operation begins with the low alarm which activates the ventilation system. At high alarm, the panel mounted audible alarm as well as any remote alarm devices that are controlled by the high alarm relay will be activated. Critical Environment Technologies Canada Inc. Unit 145, 7391 Vantage Way Delta, BC, V4G 1M3, Canada www.critical-environment.com
TF: +1.877.940.8741 T: +1.604.940.8741 F: +1.604.940.8745 © January 2015 | Data subject to change without notice.
PDC + LPT-A AMMONIA MONITORING SYSTEM
Cold Storage & Freezer Room Applications Typical Cold Storage or Freezer Room Ammonia Monitoring System
LPT-A-NH3 Transmitter
Remote Strobe & Horn (water tight)
Remote Strobe & Horn (standard)
PDC Multi-Channel Controller
Line Voltage 120 VAC Door Entrance
Cold Storage Room (or Freezer Room)
Cold storage and freezer rooms vary in size, height and layout. Generally, one fixed LPT-A-NH3 transmitter will provide coverage for approximately 5,000 sq ft. However the arrangement of the shelving units and the amount of food being stored can create walls that segregate areas that cannot be monitored by one transmitter. In this case, multiple LPT-A-NH3 transmitters are recommended to ensure that the health and safety of employees is not jeopardized if an ammonia leak does occur. Ammonia gas is lighter than air and will accumulate at the highest point in the room. Therefore, the LPT-A-NH3 should be mounted on the ceiling (regardless of how high the ceiling is) away from ventilation fans and any rapidly moving air. The LCD display on the LPT-A-NH3 transmitter can be enabled or disabled, as can the audible alarm. If the temperature of the room is below -20oC (-4oF), an optional heater can be added to the LPT-A-NH3 so the LCD display continues to function in the colder temperatures. When connected to the PDC Controller, the gas measurement readings will be transmitted to the controller and will be viewable on its display. The PDC Multi-Channel Controller should be mounted outside the cold storage room entry door. It will interface to the LPT-A-NH3 transmitter(s) inside the room and will display the target gas levels for viewing prior to entering the room. The PDC is pre-programmed and completely field adjustable using the board mounted push button keypad. Functions that can be set include relay assignment, time delays, complex zoning, sensor types and ranges, alarm set points, etc. There is a two line backlit LCD display that actively scrolls through all the programmed channels and displays the gas name, concentration and alarm status. The PDC should be configured to set off alarms and activate the exhaust ventilation system or other alarm procedures as appropriate when a leak is detected. The PDC can accept inputs from up to 8 analog transmitters, or 120 digital transmitters using RS-485 digital communication, making it the ideal central controller for any additional gas detection transmitters that may be needed throughout the building. Remote visual and audible alarm devices such as the Remote Strobe & Horn (RSH-24) should be set up inside the room and outside each entrance to the room. Critical Environment Technologies Canada Inc. Unit 145, 7391 Vantage Way Delta, BC, V4G 1M3, Canada www.critical-environment.com
TF: +1.877.940.8741 T: +1.604.940.8741 F: +1.604.940.8745 © January 2015 | Data subject to change without notice.
LPT-A-NH3
Analog Transmitter Ammonia Monitoring System
The LPT-A-NH3 is an economical, single sensor, analog transmitter that is ideal for monitoring ammonia in cold storage rooms, freezer rooms, bottling facilities and other various food processing plants. Features include 3-wire VDC or 4-wire VAC power, a linear 4-20 mA or 0-10 volt output signal that can be used to interface with the PDC Multi-Channel Controller, a graphic LCD digital display with user selectable functionality, an audible and visual alarm and a standard dry contact relay that can be used to activate remote alarm devices or turn on/off systems.
KEY FEATURES » 3-wire VDC or 4-wire VAC power » 24 volt DC or AC power (nominal) » Linear 4 - 20 mA or 0 - 10 volt output signal » 1 dry contact relay, 30 volt 2 amp maximum » Standard water / dust tight, corrosion resistant enclosure (drip proof) » Available with an (internal) electrochemical sensor or an (internal or remote) solid state or catalytic sensor » Graphic LCD display (user selectable function) » Audible alarm » Includes sensor CEF (calibration extending firmware) » Auto resetting fuse » Automated calibration procedure » RoHS compliant package » Optional splash guard and LCD display heater
technical drawing
technical specifications MECHANICAL Enclosure Weight Size Display
ABS / Polycarbonate 400 g (14 oz) 5.0” x 5.0” x 2.1” (127 mm x 127 mm x 53.34 mm) LCD digital display
ELECTRICAL
Fuse
3-wire mode: 16-30 VDC, 3 W, Class 2 4-wire mode: 12-27 VAC, 50-60 Hz, 3 VA, Class 2 VDC (or ground reference AC) three conductor shielded 18 awg stranded within conduit VAC four conductor shielded 18 awg stranded within conduit Automatic resetting thermal
INPUT / OUTPUT Outputs Alarm Relay
Linear 4 - 20 mA Audible alarm Dry contact relay rated 30 volts, 2 amp maximum
Power Requirement Wiring
ENVIRONMENTAL (sensor dependant) -20°C to 40°C (-4°F to 104°F) Operating Temperature Low temperature option available to -40°C (-40°F) (sensor dependant) Humidity 15 - 90% RH non-condensing SENSORS Electrochemical Life Span
Ammonia (NH3) sensor (0 - 500 ppm) 2 years
CERTIFICATION Conforms to: CSA-C22.2 No. 205-M1983 (R2009) UL508 (Edition 17):2007 Conforms to: EMC Directive 2004/108/EC EN 50270:2006, Type 1, EN61010 Conforms to: 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.
Critical Environment Technologies Canada Inc. Unit 145, 7391 Vantage Way Delta, BC, V4G 1M3, Canada www.critical-environment.com
TF: +1.877.940.8741 T: +1.604.940.8741 F: +1.604.940.8745 © January 2015 | Data subject to change without notice.
PDC
Multi-Channel Controller Ammonia Monitoring System
The PDC Multi-Channel Controller is a programmable analog or digital controller designed to accept inputs from up to 8 analog transmitters or 128 digital transmitters on RS485 ModBus communication. The micro-controller based circuit provides a wide range of configuration possibilities including simple or complex zoning, changing alarm set points, time delays and relay addressing. There is a two line backlit LCD display that actively scrolls through all the programmed channels and displays the gas name, concentration and alarm status. When used as part of a cold storage or freezer room monitoring system, the PDC should be configured to set off alarms and activate the exhaust ventilation system when an ammonia leak is detected.
KEY FEATURES » Scrolling, two line LCD display » LED alarm indicators » Completely field programmable » Low, mid and high alarm setpoints » Audible alarm with silence button » Four wire daisy-chain wiring » Eight onboard SPDT relays » Relay output module » Up to 8 analog transmitters or up to 120 digital transmitters » RS-485 communication with digital transmitters » RoHS compliant circuit boards » Optional BACnet® output module » CSA & UL certified
technical drawing
Critical Environment Technologies Canada Inc. Unit 145, 7391 Vantage Way Delta, BC, V4G 1M3, Canada www.critical-environment.com
technical specifications MECHANICAL Enclosure Weight Size Display ELECTRICAL Power Requirement
Lockable, powder painted 18 gauge steel 4.3 kg (9.4 ilbs) 12.3” x 12.3” x 4.2” (311 mm x 311 mm x 106 mm) LCD digital display
Fuse
90 - 240 VAC, 47 - 63 Hz Analog 3-wire shielded Digital daisychain only, shielded 2-wire 14 guage stranded power 2-wire 18 guage twisted pair network Automatic resetting thermal
INPUT / OUTPUT Outputs Alarm Relay
4 - 20 mA signals Optional horn and/or strobe light alarm 8 dry SPDT contact, 5 amps @ 240 V each
Wiring
ENVIRONMENTAL (sensor dependant) Operating Temperature 0°C to 40°C (32°F to 104°F) Humidity 10 - 95% RH non-condensing ACCESSORIES RRM-8 PDC-BACNET RSH-24 RAP-128 PDC-OPTION-H PDC-OPTION-L UPS-MGE-81600
Remote Relay Module, 8 relays each BACnet® Output Module Remote Strobe & Horn Combo Remote Annunciator Remote Industrial Horn, 103 dB Remote Strobe Light, 4” diameter Power backup system, 120 VAC input / output
CERTIFICATION CSA & UL
Certified
TF: +1.877.940.8741 T: +1.604.940.8741 F: +1.604.940.8745 © January 2015 | Data subject to change without notice.
