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Summary of Contents for Critical Environment Technologies LPT-M Series
- Page 1 Operation Manual Rev. B | 2022.03 LPT-M Modbus® Digital Transmitter www.critical-environment.com...
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Page 2: Table Of Contents
LPT-M - Operation Manual Rev. B | 2022.03 TABLE OF CONTENTS 1 POLICIES ....................... 6 1.1 Important Note ....................6 1.2 Warranty Policy ....................7 1.3 Service Policy ....................7 1.4 Copyrights ......................8 1.5 Disclaimer ......................9 1.6 Revisions......................9 2 INTRODUCTION ...................10 2.1 General Description ..................10 2.2 Key Features .................... - Page 3 Rev. B | 2022.03 LPT-M - Operation Manual 5.5.3 Mounting Height (Sensor Dependent) ........26 5.6 Enclosure Mounting Components ............. 27 5.6.1 Enclosure Base ................27 5.6.2 Enclosure Bottom ................28 5.7 Wiring Connections ..................28 5.7.1 Power & Output Connections ............29 5.7.2 Relay Wiring Connection ...............
- Page 4 LPT-M - Operation Manual Rev. B | 2022.03 6.10 Test Functions ..................... 49 6.10.1 Test Audible / Buzzer ..............49 6.10.2 Test Relay ..................49 6.10.3 Test Gas Reading Response / Send Test Reading to Controller ....................50 6.11 Setting Channel Alarm Setpoints ............. 52 6.11.1 Setting the Low Alarm Setpoint ..........
- Page 5 Rev. B | 2022.03 LPT-M - Operation Manual 7.4 Calibrating an ESH-A Remote Sensor Connected to an LPT-M ... 63 7.4.1 Zero and Span Calibration of a Responsive ESH-A Remote Sensor ......................63 7.4.2 Zero Calibration of a New or Replacement ESH-A Remote Sensor ......................
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Page 6: Policies
LPT-M - Operation Manual Rev. B | 2022.03 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 7: Warranty Policy
The product is only to be used for the purposes stated in the manual. Critical Environment Technologies is not liable for auxiliary interfaced equipment or consequential damage. -
Page 8: Copyrights
RMA number. If CETCI is to do the repair work, you may send the instrument, prepaid, to: Attention: Service Department Critical Environment Technologies Canada Inc. Unit 145, 7391 Vantage Way Delta, BC, V4G 1M3... -
Page 9: Disclaimer
CETCI at the following address: Critical Environment Technologies Canada Inc. Unit 145, 7391 Vantage Way, Delta, BC, V4G 1M3, Canada © 2022 All rights reserved. Data subject to change without notice. -
Page 10: Introduction
LPT-M - Operation Manual Rev. B | 2022.03 Toll Free: +1.877.940.8741 Telephone: +1.604.940.8741 Email: marketing@cetci.com Website: www.critical-environment.com In no event will CETCI, its officers or employees be liable for any direct, special, incidental or consequential damages resulting from any defect in any manual, even if advised of the possibility of such damages. -
Page 11: Key Features
Rev. B | 2022.03 LPT-M - Operation Manual optional internal heater for is available for cold environment applications. If after reading through the manual, you have any questions, please do not hesitate to contact our Technical Service Department for technical support. 2.2 Key Features •... -
Page 12: Instrument Specifications
LPT-M - Operation Manual Rev. B | 2022.03 3 INSTRUMENT SPECIFICATIONS 3.1 Technical Specifications MECHANICAL ABS / Polycarbonate, IP54 rating with splash guard Enclosure installed. Copper coated interior to reduce RF interference. 400 g / 14 oz Weight 127 mm x 127 mm x 71 mm Size 5.0 in x 5.0 in x 2.8 in ELECTRICAL... - Page 13 Rev. B | 2022.03 LPT-M - Operation Manual USER INTERFACE Graphic LCD, green border. Text prompting for Display calibration operation and fault indications. Installer configurable to suppress all other displays. Use a magnetic wand to access menu options and Magnetic Sensors initiate calibration without opening the enclosure.
- Page 14 LPT-M - Operation Manual Rev. B | 2022.03 ENVIRONMENTAL -20°C to 40°C / -4°F to 104°F NOTE: Low temperature option available to -40°C Operating / -40°F) (Sensor dependent, some extremely cold Temperature applications may require a small internal silicone heater to maintain temperature stability for sensor. Contact CETCI for details) Operating Humidity 15 - 90% RH non-condensing...
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Page 15: Internal Sensor Gas Types
Rev. B | 2022.03 LPT-M - Operation Manual 3.2 Internal Sensor Gas Types Internal Electrochemical Part Number Range Lifespan Sensors Ammonia (NH LPT-M-NH3 0 - 500 ppm ~2 years Carbon Monoxide (CO) LPT-M-TCO 0 - 200 ppm ~6 years Chlorine (Cl LPT-M-CL2 0 - 5.0 ppm ~3 years... -
Page 16: Esh-A Remote Sensor Gas Types
LPT-M - Operation Manual Rev. B | 2022.03 3.3 ESH-A Remote Sensor Gas Types ESH-A Remote Sensors - Combustible (Catalytic) Hydrogen (H ESH-A- 0 - 100% LEL ~5 years CH2-100 Methane (CH ESH-A- 0 - 100% LEL ~5 years CCH4-100 Propane (C ESH-A- 0 - 100% LEL... -
Page 17: Enclosure Dimensions
Rev. B | 2022.03 LPT-M - Operation Manual 3.4 Enclosure Dimensions Above dimensions are shown with optional splash guard. Without splash guard, thickness is 71 mm / 2.8 in. The area required for enclosure door to be open 90 degrees is 178 mm / 7.0 in or 254 mm / 10.0 in for fully open. With the optional splash guard installed, the enclosure is IP54 rated. -
Page 18: Instrument Features
LPT-M - Operation Manual Rev. B | 2022.03 4 INSTRUMENT FEATURES 4.1 Exterior Enclosure ARROW Side view of LPT-M showing ENTER location of Magnetic Sensors. ARROW DOWN © 2022 All rights reserved. Data subject to change without notice. - Page 19 Rev. B | 2022.03 LPT-M - Operation Manual NUMBER FEATURE FUNCTION Secures door to base and allows Door Hinge easy opening and closing Graphic LCD display. Green Display with green border indicates transmitter border operation is Modbus® Use a magnetic wand to access Magnetic Sensors menu options and program ...
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Page 20: Interior System Layout
LPT-M - Operation Manual Rev. B | 2022.03 4.2 Interior System Layout © 2022 All rights reserved. Data subject to change without notice. -
Page 21: Installation
Rev. B | 2022.03 LPT-M - Operation Manual NUMBER FEATURE FUNCTION Access menu options and program Programming functions using buttons inside the Buttons enclosure. (Arrow up, Enter, Arrow down) Remote Sensor Terminal for connecting the ESH-A Remote Terminal Sensor Low voltage pluggable terminal for relay Relay Terminal... -
Page 22: Special Considerations For Different Types Of Sensors
LPT-M - Operation Manual Rev. B | 2022.03 NOTE: All sensors are calibrated in the factory and do not require calibration at the time of a routine installation. NOTE: Temperature affects calibration. It is important to ensure the gas is at the appropriate temperature during calibration. -
Page 23: General Safety Warnings
Rev. B | 2022.03 LPT-M - Operation Manual 5.2 General Safety Warnings The LPT-M is intended for indoor use, permanently mounted at a height that is appropriate for the type of gas being monitored. See Section5.5 Mounting the Transmitter. The LPT-M should be protected from extreme weather conditions. The LPT-M requires no assembly and virtually no maintenance other than regular calibration of the internal and/or remote sensors and ensuring that excess water or dust is not somehow entering the enclosure and physically... -
Page 24: Mounting The Transmitter
LPT-M - Operation Manual Rev. B | 2022.03 the hinges. The door should only be removed when absolutely required. Any damage occurring from door removal procedure will not be covered under warranty. Grasp the door with one hand, being careful not to make contact with any of the internal components (circuit board), and grasp the base with your other hand. -
Page 25: Wet Environment Considerations
Rev. B | 2022.03 LPT-M - Operation Manual use a conduit connector that has more than 12.7 mm (½ in) of thread length. NOTE: When mounting the enclosure, allow enough room to allow the end user to open the door fully to access the internal adjustments. 5.5.1 Wet Environment Considerations If the LPT-M is to be installed in a potential hose-down application or any application whereby liquid could be directed towards the sensor opening, the... -
Page 26: Mounting Height (Sensor Dependent)
LPT-M - Operation Manual Rev. B | 2022.03 Bluetooth enabled devices, cell phones and other electrical equipment may interfere with the response of the gas detectors. 5.5.3 Mounting Height (Sensor Dependent) The sensor mounting height depends on the density of the gas relative to air. -
Page 27: Enclosure Mounting Components
Rev. B | 2022.03 LPT-M - Operation Manual 5.6 Enclosure Mounting Components 5.6.1 Enclosure Base NUMBER FEATURE Door Hinge 1/2” Conduit Entry Knockout Mounting Holes © 2022 All rights reserved. Data subject to change without notice. -
Page 28: Enclosure Bottom
LPT-M - Operation Manual Rev. B | 2022.03 5.6.2 Enclosure Bottom NUMBER FEATURE Door Hinge 1/2” Conduit Entry Knockout 5.7 Wiring Connections The LPT-M digital transmitter is a low voltage powered device. Any application of operating voltages higher than indicated in the specification may result in damage. -
Page 29: Power & Output Connections
Rev. B | 2022.03 LPT-M - Operation Manual To ensure robust data communications, a daisy chain wiring configuration must be used. This means, four wires run from one end of the digital network to the other, through the same connections along the entire run. From one digital device to the next digital device, A goes to A;... - Page 30 LPT-M - Operation Manual Rev. B | 2022.03 power supplies or 24 VAC Class 2 Transformers need to be used. In all cases the voltage supply to the LPT-M should never drop below 18 VDC or 20 VAC. System power: The main wiring terminal strip on the LPT-M circuit board can be unplugged for easier wiring installation.
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Page 31: Relay Wiring Connection
Rev. B | 2022.03 LPT-M - Operation Manual Wiring Example: 4-Wire VDC 5.7.2 Relay Wiring Connection The relay operates in “failsafe” mode, i.e. the relay coil is energized under normal non-alarm conditions. The relay is de-energized when if power fails. In most applications the relay function should use the common “COM”... -
Page 32: Esh-A Remote Sensor Wiring Connection
LPT-M - Operation Manual Rev. B | 2022.03 Wiring Example: Relay 5.7.3 ESH-A Remote Sensor Wiring Connection Each ESH-A is given the same serial number as the device it is being connected to. Make sure to connect the ESH-A to the LPT-M that has the same serial number or the system won’t work. -
Page 33: Modbus® Wire Gauge Vs Run Length
Rev. B | 2022.03 LPT-M - Operation Manual The maximum length of wire between the ESH-A Remote Sensor and the transmitter should not exceed 61 m (200 ft). 5.7.4 Modbus® Wire Gauge vs Run Length This table shows the maximum cable length between the LPT-M and the BAS / DDC controller for normal installations. - Page 34 LPT-M - Operation Manual Rev. B | 2022.03 © 2022 All rights reserved. Data subject to change without notice.
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Page 35: System Operation & Configuration
Rev. B | 2022.03 LPT-M - Operation Manual 6 SYSTEM OPERATION & CONFIGURATION NOTE: The LPT-M can operate as part of a Modbus® network or as a standalone gas detection device. When part of a Modbus® network, the LPT-M will continuously monitor gas concentrations on the configured channels and communicate the information back, when requested, to the BAS / DDC / controller via Modbus®... -
Page 36: Accessing The Menu With Passcodes
LPT-M - Operation Manual Rev. B | 2022.03 ARROW UP - used for going up through the menus or incrementing values or selecting an alpha character ENTER - used pirmarily as an enter key, either for getting to the next screen or stepping through a numeric or alpha value ARROW DOWN - used for scrolling down through the menus or decrementing values or selecting an alpha character... - Page 37 Rev. B | 2022.03 LPT-M - Operation Manual CODE NAME DESCRIPTION • Adjust Display Contrast • Program Audible • Enable / Disable Audible • Audible ON Delay • Audible Alarm setpoints (Low, Med, High, Fault) • Test Audible / Buzzer Hardware •...
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Page 38: Power Up And Warm-Up
LPT-M - Operation Manual Rev. B | 2022.03 6.3 Power Up and Warm-up The current gas level reading can be monitored at any time during normal operation using the display. The display will be backlit when the menu is in active use. - Page 39 Rev. B | 2022.03 LPT-M - Operation Manual If the LPT-M is part of a system, such connected to a QCC or FCS, each gas channel splash screen will show the current status of the channel: • OK - gas channel is operating normally •...
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Page 40: Set Lcd Display Contrast Level
LPT-M - Operation Manual Rev. B | 2022.03 6.5 Set LCD Display Contrast Level The contrast level of the LCD display can be changed to be made more visible in high light, low light and/or different temperatures that may require a different contrast setting. -
Page 41: Modbus® Settings
Rev. B | 2022.03 LPT-M - Operation Manual 6.7 Modbus® Settings The LPT-M transmitter operates on a local area network (LAN) using Modbus® RTU RS-485 serial communications. Complete systems (controller with digital transmitters and peripherals) will be shipped pre-configured with the appropriate Modbus®... -
Page 42: Modbus® Holding Registers
LPT-M - Operation Manual Rev. B | 2022.03 change the baud rate, in the Hardware Configuration Menu (passcode 1001), press either ARROW to scroll through the menu and select BAUD. Press ENTER and use the ARROW keys to scroll through the baud rates to choose from: •... -
Page 43: Enable / Disable Audible
Rev. B | 2022.03 LPT-M - Operation Manual the backlight of the display will flash on and off. The alarm and the flashing display can be stopped for a period of time by pressing the ENTER button. 6.8.1 Enable / Disable Audible The factory default for the buzzer setting is ENABLED. -
Page 44: Audible Alarm Level Assignment
LPT-M - Operation Manual Rev. B | 2022.03 Press ENTER and use the ARROW keys to scroll through the menu and select Audible Delay On. Press ENTER and use the ARROW keys to increase or decrease the number of seconds. Move to the next digit by pressing ENTER. When finished, press ENTER to save and Exit. -
Page 45: Relay Operation
Rev. B | 2022.03 LPT-M - Operation Manual Enter to save and Exit. 6.9 Relay Operation The LPT-M has one dry contact relay that are designed to operate fans or to control equipment that draws no more than 3 volts, 2 amps max at start-up and / or operational current. -
Page 46: Setting Relay On / Off Delay
LPT-M - Operation Manual Rev. B | 2022.03 Scroll through the menu and choose Relay Enable. Press ENTER to choose between ON or OFF. 6.9.2 Setting Relay ON / OFF Delay The LPT-M comes with a configurable ON and OFF delay for its relays. In the event of a gas build up in excess of the level set for the specified alarm level, the relay will be triggered. -
Page 47: Relay Mode Of Operation (Normal Or Failsafe)
Rev. B | 2022.03 LPT-M - Operation Manual Press ENTER to access the screen and use the ARROW keys to increase or decrease the number. Press ENTER to move to the next digit and again to save and Exit the screen. To set the Relay OFF DELAY: In the Hardware Configuration Menu (passcode 1001), press either ARROW to scroll through the menu and select Program Relay. -
Page 48: Relay Alarm Level Assignment
LPT-M - Operation Manual Rev. B | 2022.03 In the Hardware Configuration Menu (passcode 1001), press either ARROW to scroll through the menu and select Program Relay. Press ENTER to select. Scroll through the menu and choose Relay Failsafe. Press ENTER to select Yes or No. -
Page 49: Test Functions
Rev. B | 2022.03 LPT-M - Operation Manual 6.10 Test Functions 6.10.1 Test Audible (Buzzer) NOTE: Before testing the audible alarm/sounding the buzzer, warn people in the vicinity of the sound so unnecessary distress or response is not caused. In the Hardware Configuration Menu (passcode 1001), press either ARROW to scroll through the menu and select Program Audible. -
Page 50: Test Gas Reading Response / Send Test Reading To Controller
LPT-M - Operation Manual Rev. B | 2022.03 Move to the next digit by pressing ENTER. When finished, press ENTER to save and Exit. The test will start immediately and will continue for as long as the time was set. The remaining time of the test can be seen counting down on the display. - Page 51 Rev. B | 2022.03 LPT-M - Operation Manual scroll through the menu and select the channel for which you want to test the gas reading response. Press ENTER and use the ARROW keys to scroll through the menu and choose TEST.
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Page 52: Setting Channel Alarm Setpoints
LPT-M - Operation Manual Rev. B | 2022.03 timeout after 5 minutes and return to normal operation. Repeat for each channel you want to test. 6.11 Setting Channel Alarm Setpoints The LPT-M is configurable as a one, two or three channel gas detector and each channel has three gas alarm setpoints, LOW, MID and HIGH which can be ascending or descending. -
Page 53: Setting The Mid Alarm Setpoint
Rev. B | 2022.03 LPT-M - Operation Manual Press ENTER again to change the setpoint value by using the ARROW keys to increase or decrease the number. Press ENTER to move to the next digit and again to save and Exit the screen. NOTE: An Ascending alarm is used when the normal gas level starts out below the alarm setting and when the reading goes above it, the alarm will trip. -
Page 54: Setting Hysteresis
LPT-M - Operation Manual Rev. B | 2022.03 Default setpoints are as follows: HIGH SENSOR GAS TYPE LOW ALARM ALARM ALARM Carbon Monoxide (CO) 25 ppm 50 ppm 100 ppm Nitrogen Dioxide (NO 0.7 ppm 1.0 ppm 1.5 ppm Combustibles (catalytic) 10% LEL 15% LEL 20% LEL... -
Page 55: Enable / Disable Channels
Rev. B | 2022.03 LPT-M - Operation Manual 6.12 Enable / Disable Channels This setting allows you to enable or disable the channel(s). If a channel with a viable sensor is disabled, the gas readings gathered by that channel will not be used to control the relays and/or alarms. -
Page 56: Regulators & Flow
LPT-M - Operation Manual Rev. B | 2022.03 directing span gas into the sensor may result in slightly higher readings. It is important to note that the type of gas mixture, how old the gas is and what temperature it has been stored at will also affect repeatability during field calibration. -
Page 57: Gas Testing Frequency (Bump Testing)
Rev. B | 2022.03 LPT-M - Operation Manual the alarm set points should be indicated on a label on the front door of the enclosure so anyone working in the environment can be aware. Equipment: Calibration Kit, Calibration gases, digital multi-meter, magnetic wand Users can order the calibration kit, calibration accessories and / or gases from any CETCI authorized distributor or you can supply your own gas and... -
Page 58: Calibrating The Internal Sensor(S)
LPT-M - Operation Manual Rev. B | 2022.03 magnetic wand to engage the magnetic sensors that are on the side of the enclosure. Refer to Section 4.1 Exterior Enclosure for location photo. This is particularly useful if in a wet or dirty environment. A magnet of sufficient strength will be required to trip the sensors. - Page 59 Rev. B | 2022.03 LPT-M - Operation Manual Attach the regulator to the cylinder of zero air, insert calibration adapter into the sensor opening on the front of the enclosure door (see Section 7.3.1 Calibration Adapter Plug if the adapter will not fit). Press Enter to start the Zero calibration. The display will show a countdown from 18 seconds.
- Page 60 LPT-M - Operation Manual Rev. B | 2022.03 ENTER and use the ARROW key to scroll to Calibrate Span. Press ENTER and use the ARROW keys in increase or decrease the span gas value. When the correct value is displayed, attach the regulator to the span gas cylinder and flow the span gas over the sensor.
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Page 61: Troubleshooting Calibration
Rev. B | 2022.03 LPT-M - Operation Manual 7.3 Trouble Shooting Calibration This section is intended to aid in correcting issues that may arise during the calibration procedure. If you are unable to correct a problem or you have questions, please contact our Technical Service Department at help@cetci.com or 604-940-8741 (Local) or 1877-940-8741 (Toll Free). -
Page 62: Span - Requires Override
LPT-M - Operation Manual Rev. B | 2022.03 7.3.4 Span - Requires Override During the Span calibration, readings are taken and from the results sensitivity is calculated and compared to the original sensitivity of the sensor at the time of installation. If this sensitivity is below the override range, but above the fault limit, the display will indicate that an override is required. -
Page 63: Calibrating An Esh-A Remote Sensor Connected To An Lpt-M
Rev. B | 2022.03 LPT-M - Operation Manual 7.4 Calibrating an ESH-A Remote Sensor Connected to an LPT-M There are two different processes for calibrating an ESH-A Remote Sensor. One process is for a new or replacement sensor and the other is for a properly functioning sensor. -
Page 64: Calibrating An Oxygen Sensor
LPT-M - Operation Manual Rev. B | 2022.03 Step 2 Apply the correct Null gas for the type of sensor installed, for a minimum of 2 minutes. Step 3 Attach a volt meter to TP1 and TP2. Using the POT RN1 potentiometer (located on the left underside of the ESH-A board), adjust the voltage to read 0.40 VDC. - Page 65 Rev. B | 2022.03 LPT-M - Operation Manual Set the span calibration gas level. It is important to make sure that the span gas level value matches the calibration gas concentration you are using to calibrate the sensor. The factory default calibration gas concentration is: SENSOR GAS TYPE CALIBRATION GAS LEVEL Oxygen (O...
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Page 66: Accessories
LPT-M - Operation Manual Rev. B | 2022.03 Considerations for Different Types of Sensors. Step 2 In the Sensor Configuration Menu (passcode 3032), press either ARROW key to scroll through the menu and select the channel with the Oxygen sensor you want to calibrate. -
Page 67: Calibration Adapter Clip "Cal Clip
Rev. B | 2022.03 LPT-M - Operation Manual 8.2 Calibration Adapter Clip “Cal Clip” (p/n: CET-SGC) To calibrate an LPT-M with a factory installed splash guard (Option -S), attach the Cal Clip around the splash guard. The small barb hose fitting accommodates standard or Teflon tubing of 1/8”... -
Page 68: Metal Protective Guards
LPT-M - Operation Manual Rev. B | 2022.03 8.4 Metal Protective Guards (p/n: SCS-8000-RSG) The metal protective guard (p/n: SCS-8000-RSG) is made of heavy duty metal and helps protect against abrasive damage, theft and vandalism to the transmitters. The 16-gauge powder coated steel has 13 mm (½ in) square openings in the front to allow gas and air to flow through to the sensor. -
Page 69: Maintenance
Rev. B | 2022.03 LPT-M - Operation Manual calibrations. It comes in a durable, hard plastic carrying case and includes a regulator, adapters, humidification chamber, brass fitting, hand tools and tubing. It does not include cylinders of gas. These must be ordered separately. Calibration Kits and gases are available from the CETCI factory. -
Page 70: Trouble Shooting
LPT-M - Operation Manual Rev. B | 2022.03 10 TROUBLE SHOOTING LPT-M won’t power up. (blank display) Is the power properly connected? Check the connections. Refer to Section 5.7 Wiring Connections. Check the display contrast. Refer to Section 6.5 Set LCD Display Contrast Level. - Page 71 Rev. B | 2022.03 LPT-M - Operation Manual Diagnostic information for Technical Service Support use. To fast track troubleshooting issues with our technicians, before emailing or calling our Technical Service Department, please take a picture of the diagnostic screen and include it in your email. If you are calling, please have this information ready to relay to our technician.
- Page 72 SAFER AIR EVERYWHERE. www.critical-enviroment.com LPT-M20220309-B Unit 145, 7391 Vantage Way, Delta, BC V4G 1M3 Canada Tel: +1.604.940.8741 Toll Free: +1.877.940.8741 © 2022 All rights reserved. Data subject to change without notice.
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