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Summary of Contents for Critical Environment Technologies LPT-A
- Page 1 Operation Manual Rev. G / H | 2015.05 LPT-A Analog Transmitter www.critical-environment.com...
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Page 2: Table Of Contents
LPT-A - Operation Manual Rev. G / H | 2015.05 Table of ConTenTs 1 POLICIES ......................5 1.1 Important Note ....................5 1.2 Warranty Policy ....................6 1.3 Service Policy ....................6 1.4 Copyrights ......................7 1.5 Dislclaimer .......................8 1.6 Revisions ......................8 2 INTRODUCTION ..................... 9 2.1 General Description ..................9... - Page 3 Rev. G /H | 2015.05 LPT-A - Operation Manual 6 INSTALLATION ....................22 6.1 General Safety Warnings ................22 6.2 Protection Against Electrical Risks ..............22 6.3 Protection Against Mechanical Risks ..............23 6.4 System Installation ..................23 6.5 Sensor Mounting Heights ................24 6.6 Enclosure Mounting Components ..............26 6.6.1 Enclosure Base ....................
- Page 4 LPT-A - Operation Manual Rev. G / H | 2015.05 8 CALIBRATION ....................38 8.1 Calibration Specifications ................38 8.1.1 Gas ........................8.1.2 Regulators & Flow ................... 8.1.3 Adapters......................8.1.4 Humidifier ....................... 8.2 Calibrating Sensors ..................40 8.2.1 Calibration Frequency ..................8.2.2 Gas Testing Frequency (Bump Testing) ............
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Page 5: Policies
Rev. G /H | 2015.05 LPT-A - Operation Manual 1 PolICIes 1.1 Important note Read and understand this manual prior to using this instrument. Carefully read the warranty policy, service policy, notices, disclaimers and revisions on the following pages. This product must be installed by a qualified electrician or factory trained technician and according to instructions indicated in this manual. -
Page 6: Warranty Policy
Rev. G / H | 2015.05 1.2 Warranty Policy Critical Environment Technologies Canada Inc. (CETCI), also referred to as the manufacturer, warrants this instrument, (excluding sensors, battery packs, batteries, pumps and filters) to be free from defects in materials and workmanship for a period of two years from the date of purchase from our facility. -
Page 7: Copyrights
Rev. G /H | 2015.05 LPT-A - Operation Manual Should your instrument require non-warranty repair, you may contact the distributor from whom it was purchased or you may contact CETCI directly. Prior to shipping equipment to CETCI, contact our office for an RMA #. All returned goods must be accompanied with an RMA number. -
Page 8: Dislclaimer
LPT-A - Operation Manual Rev. G / H | 2015.05 1.5 Disclaimer Under no circumstances will CETCI be liable for any claims, losses or damages resulting from or arising out of the repair or modification of this equipment by a party other than CETCI service... -
Page 9: Introduction
2 InTRoDUCTIon 2.1 General Description Thank you for purchasing our LPT-A Analog Transmitter. The LPT-A transmitters are rugged, user-friendly analog gas detection transmitters for use in non-hazardous (non-explosion rated) environments such as commercial HVAC and light industrial applications. A standard transmitter features a back lit, LCD digital display (refer to Section 3.1 Technical Specifications), analog output signal, one dry relay contact, audible alarm, and a standard water / dust tight enclosure. -
Page 10: Key Features
LPT-A - Operation Manual Rev. G / H | 2015.05 If after reading through the manual, you have any questions, please do not hesitate to contact our service department for technical support. 2.2 Key features • 3-wire VDC or 4-wire VAC power • 24 volt DC or AC power (nominal) -
Page 11: Instrument Specifications
Rev. G /H | 2015.05 LPT-A - Operation Manual 3 InsTRUMenT sPeCIfICaTIons 3.1 Technical specifications MECHANICAL Enclosure ABS / Polycarbonate Weight 400 g (14 oz) Size 5.0” x 5.0” x 2.1” (127 mm x 127 mm x 53.34 mm) ELECTRICAL... - Page 12 LPT-A - Operation Manual Rev. G / H | 2015.05 Fuse Automatic resetting thermal Graphic LCD Indicator Text prompting for calibration operation and fault indications. Installer configurable to suppress all other displays. ENVIRONMENTAL -20°C to 40°C (-4°F to 104°F) NOTE: Low temperature option available to -40°C (-40°F) (Sensor...
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Page 13: Standard Enclosure Dimensions
Rev. G /H | 2015.05 LPT-A - Operation Manual 3.2 standard enclosure Dimensions Above dimensions are shown with optional splash guard. Without splash guard, thickness is 2.1 in (53.34 mm). The area required for enclosure door to be open 90 degrees is 6.13” (155.7 mm) or 9.6”... -
Page 14: Sensor Specifications
LPT-A - Operation Manual Rev. G / H | 2015.05 4 sensoR sPeCIfICaTIons 4.1 list of available sensors SENSOR GAS TYPE PART NUMBER RANGE Ammonia (NH LPT-A-NH3 0 - 500 ppm Carbon Monoxide (CO) LPT-A-COA (3 year sensor) 0 - 200 ppm... - Page 15 Rev. G /H | 2015.05 LPT-A - Operation Manual SENSOR GAS TYPE PART NUMBER RANGE Silane (SiH LPT-A-SIH4 0 - 20 ppm Sulphur Dioxide (SO LPT-A-SO2 0 - 20 ppm Refrigerant (R22) LPT-A-R22 0 - 2,000 ppm Refrigerant (R134A) LPT-A-R134A...
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Page 16: Calibration Extending Firmware (Cef) And Sensor Aging
4.2 Calibration extending firmware (Cef) and sensor aging Some LPT-A systems with certain electrochemical sensors have been programmed with our Calibration Extending Firmware (CEF). This firmware takes into consideration the aging of the sensors so that less frequent calibrations are acceptable in less-critical applications such as parking garages. - Page 17 Rev. G /H | 2015.05 LPT-A - Operation Manual NUMBER FEATURE FUNCTION Door Hinge Secures door Indicates transmitter operation Display with gray border Door Screw Secures door Sensor Opening Allows gas diffusion into sensor Padlock Opening For security padlock ...
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Page 18: Interior System Layout
LPT-A - Operation Manual Rev. G / H | 2015.05 5.2 Interior system layout 5.2.1 Electrochemical Sensor © 2015 All rights reserved. Data subject to change without notice. -
Page 19: Solid State (Internal) Sensor
Rev. G /H | 2015.05 LPT-A - Operation Manual 5.2.2 Solid State (Internal) Sensor © 2015 All rights reserved. Data subject to change without notice. -
Page 20: Solid State (Remote) Sensor
LPT-A - Operation Manual Rev. G / H | 2015.05 5.3.3 Solid State (Remote) Sensor © 2015 All rights reserved. Data subject to change without notice. - Page 21 Rev. G /H | 2015.05 LPT-A - Operation Manual NUMBER FEATURE FUNCTION Buzzer Enable Enables / disables the buzzer. Rotary Encoder Sets calibration values, etc. with the jumpers. Lights if there is no connection for current output ...
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Page 22: Installation
6 InsTallaTIon 6.1 General safety Warnings The LPT-A is intended for indoor use, permanently mounted at a height that is appropriate for the type of gas being monitored. See Section 6.5 Sensor Mounting Heights. The LPT-A should be protected from extreme weather conditions. -
Page 23: Protection Against Mechanical Risks
6.4 system Installation The LPT-A should be installed on a flat vertical surface using the four 0.175” (4.4 mm) diameter mounting holes provided to maintain water tight status. Care should be taken to ensure that the face of the LPT-A is not obstructed in order to maximize the sensor’s exposure to the environment... -
Page 24: Sensor Mounting Heights
LPT-A should be ordered with an optional attached splash guard. If used in a wet or wash down application, the conduit hub entering the LPT-A enclosure must be liquid tight type. - Page 25 Rev. G /H | 2015.05 LPT-A - Operation Manual APPLICATIONS / TYPES SUGGESTED MOUNTING HEIGHT Carbon Monoxide (CO) Gas engine exhaust 4 - 6 ft above the floor Nitrogen Dioxide (NO Diesel engine exhaust Propane (C Propane fuel 6” above the floor...
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Page 26: Enclosure Mounting Components
LPT-A - Operation Manual Rev. G / H | 2015.05 6.6 enclosure Mounting Components 6.2.1 Enclosure Base NUMBER FEATURE Door Hinge 1/2” Conduit Entry Knockout Mounting Holes © 2015 All rights reserved. Data subject to change without notice. -
Page 27: Enclosure Bottom
LPT-A. 6.7.1 Power & Output Connection The LPT-A analog transmitter is a low voltage powered device. Any application of operating voltages higher than indicated in the specification may result in damage. Double check wiring connections prior to powering the transmitter. -
Page 28: Relay Connection
Rev. G / H | 2015.05 If the installer is powering the LPT-A with four wire 24 VAC, the VAC wires should be connected to the terminal “one” (AC) and terminal “two” (AC / DC), from the top down. The signal return should be connected to terminal “three”... -
Page 29: Wiring Example: 3-Wire
Rev. G /H | 2015.05 LPT-A - Operation Manual Wiring Example: 3-Wire Wiring Example: 4-Wire Wiring Example: Relay © 2015 All rights reserved. Data subject to change without notice. -
Page 30: Wiring Example: Remote Sensor
BLACK Remote Sensor LPT-A Device must be used with rated equipment. External power to LPT-A must be supplied by a Class 2 or better transformer. 6.7.3 Remote Sensor Connection Four-conductor, 16-18 awg stranded shielded cable is required for the Remote Sensor Wiring. This wiring should be run in a conduit, separate from the signal output, and should not exceed 500 feet. -
Page 31: Wire Guage Vs Run Length
Rev. G /H | 2015.05 LPT-A - Operation Manual 6.7.4 Wire Gauge vs Run Length MAXIMUM LOAD MAXIMUM CABLE SUPPLY VOLTAGE (Wire + Termination WIRE GAUGE (awg) LENGTH (feet) Resistor) (ohms) 4,400 24 VDC 7,100 10,700 216 (assume a 200 Ω... -
Page 32: Open Loop
If the 4 - 20 mA signal loop has not been connected properly or has been damaged in some manner between the analog transmitter and the device to which it is sending its signal output, the LPT-A will show an open loop icon OL at the bottom right of the display, as well as turning on the internal open loop LED. -
Page 33: Fault Detection
LPT-A - Operation Manual 7.2 fault Detection The LPT-A has built in fault detection, and in the event of a problem with the measurement circuitry the transmitter will indicate a fault condition on the display. At this point, the transmitter will output 0 mA on the current loop (or 0 volts on the voltage output). -
Page 34: Enable / Disable The Buzzer
LPT-A - Operation Manual Rev. G / H | 2015.05 The display will show the gas formula, the units and the current gas level. This is the factory default position. J10 in DISable position (pins 1 - 2 connected): The display will show abnormal conditions, e.g. fault, etc., but will not show gas readings. -
Page 35: Test Function
Note that the relay and buzzer (if enabled) will be tested, even if the SETPOINT is higher than the span gas level. During the test the display will show the span gas value, and an icon indicating that the LPT-A is in the test mode: After 5 minutes (or when the jumper is removed from the OVER / DESC / TEST position), the unit will return to normal operation. -
Page 36: Setting The "Alarm" Level
LPT-A - Operation Manual Rev. G / H | 2015.05 Voltage Output to Test Points “TP-1” and “TP-2”: Attach a volt meter’s leads to the two test points (TP-1 & TP-2) located on the lower left corner on the back of the circuit board. Set the meter to volts DC with one decimal point. The range of 0 - 4.0 VDC is equal to the full measurement range of the sensor. -
Page 37: Setting The Calibration Gas Level
SETPOINT and the OVER / DESC / TEST position. If there is no activity (turning the encoder shaft) for 5 minutes, the LPT-A will return to normal mode. After returning to normal mode the jumper will have to be moved from the SETPOINT position to the IDLE position and then re-installed at the SETPOINT position if further adjustment is needed. -
Page 38: Calibration
) can be substituted for zero air when null adjusting electrochemical sensors. Contact CETCI for clarification. Every LPT-A transmitter is calibrated in a chamber by true diffusion method prior to leaving our facility. This method more closely emulates actual “real world” conditions. Field calibration... -
Page 39: Regulators & Flow
They are available from CETCI under part number CET-7000-CAP, for an LPT-A without a splash guard or splash guard calibration cap, part number CET-4700-SCC, for an LPT-A with a splash guard or part number CET-8000-GRS, for an LPT-A with a remote sensor head. -
Page 40: Calibrating Sensors
LPT-A - Operation Manual Rev. G / H | 2015.05 8.2 Calibrating sensors 8.2.1 Calibration Frequency • Parking garage detectors: Once every 12 months • OHS applications: Once every 6 months (OHS: Occupational Health & Safety) • For best performance and to meet published specifications: once every six months 8.2.2 Gas Testing Frequency (Bump Testing) - Page 41 Rev. G /H | 2015.05 LPT-A - Operation Manual The LPT-A will need to be opened for calibration when any of the following conditions occur: • The transmitter has not been calibrated for an extended period, which has allowed the sensor aging to reach a level that there appears to be an ambient gas level higher than the transmitter is allowed to correct for.
- Page 42 Step 4. Step 3: Trigger the calibration by: • Touching the enclosure of the LPT-A with a magnet wand (below and just left of the gas vent opening) or • Moving an internal jumper from a J7 IDLE position to the CAL position.
- Page 43 Rev. G /H | 2015.05 LPT-A - Operation Manual The LPT-A will use the last four seconds of gas data to determine the zero calibration level. Depending on the reading the LPT-A will show one of the following messages: •...
- Page 44 • If the jumper is not moved to the OVER position within 30 seconds, the calibration will be cancelled and the LPT-A will return to normal mode. • After using the OVER / DESC / TEST position, the second IDLE jumper should be returned to its rest position.
- Page 45 Rev. G /H | 2015.05 LPT-A - Operation Manual • Once zeroed, the display will show ‘FLOW GAS’ and the internal calibrate state LED will flash four times and then paused with the LED off. • Disconnect the zero air (N ) from the calibration adapter.
- Page 46 If span fails repeatedly the sensor has either aged beyond its useful life or has otherwise failed, please contact our service department at service@cetci.com. NOTE: The LPT-A will automatically return to normal operation after a successful calibration. If © 2015 All rights reserved. Data subject to change without notice.
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Page 47: Accessories
If the span calibration was not successful the LPT-A will display ‘CALIBRATION FAILED! RECALIBRATE’ and output 0 mA (0 volts) until a successful calibfation is performed. -
Page 48: Magnetic Wand
LPT-A - Operation Manual Rev. G / H | 2015.05 9.2 Magnetic Wand Part Code: CET-MW The magnetic wand is used for non intrusive calibration. Lifts ½ lb solid steel Size 2 5/8” X 1/4” Hexagon 9.3 Metal Protective Guard Part Code: SCS-8000-RSG ©... -
Page 49: Sample Draw Pump
Rev. G /H | 2015.05 LPT-A - Operation Manual The metal protective guard is heavy duty metal protective guard to help protect against abrasive damage, theft and vandalism to the transmitters. This is an added preventative in addition to the product enclosure. -
Page 50: Calibration Kit
Check with any CETCI authorized distributor for availability of specific gas types. Gas cylinders cannot be shipped overseas. 10 MaInTenanCe The LPT-A transmitter requires virtually no maintenance other than regular calibration of the sensor. The transmitter should be monitored for possible damaging conditions. -
Page 51: Trouble Shooting
Is the power properly connected? Refer to Wiring Examples. Check the connections. Display shows a fault message and the current loop will output 0 mA. The LPT-A is in fault mode. If re-calibrating the sensor fails, replace the transmitter. During calibration the display shows “override” message. - Page 52 Critical Environment Technologies Canada Inc. Unit 145, 7391 Vantage Way, Delta, BC, V4G 1M3, Canada Toll Free: +1.877.940.8741 Tel: +1.604.940.8741 Fax: +1.604.940.8745 www.critical-environment.com LPTA20150521-GH © 2015 Critical Environment Technologies Canada Inc. All rights reserved. Data in this publication may change without notice.
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