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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.

SUPPLY

VOLTAGE

RS-485 BUS

IMPEDENCE

WIRE GAUGE

(AWG)

MAXIMUM

CABLE LENGTH

22 VDC

minimum

on board

termination

resistor available

(J5)

low capacitance

shielded wiring,

18 AWG

601 m (2000 ft)

at 19,200bps

In large system applications, if the recommended maximum cable length needs

to be exceeded, an LNK-XT Network Extender can be used to boost the waning

signal strength. One LNK-XT extends the network length by an additional 610 m

(2000 ft). It is recommended that an LNK-XT be installed approximately every

32 LPT-M devices, or when a drop in voltage is detected.

Содержание ESH-ACC3H8-100

Страница 1: ...Operation Manual www critical environment com LPT M Modbus Digital Transmitter Rev B 2022 03...

Страница 2: ...IONS 12 3 1 Technical Specifications 12 3 2 Internal Sensor Gas Types 15 3 3 ESH A Remote Sensor Gas Types 16 3 4 Enclosure Dimensions 17 4 INSTRUMENT FEATURES 18 4 1 Exterior Enclosure 18 4 2 Interio...

Страница 3: ...TION CONFIGURATION 35 6 1 Navigating the Menu Structure 35 6 2 Accessing the Menu with Passcodes 36 6 3 Power Up and Warm up 38 6 4 Display Select 38 6 5 Set LCD Display Contrast Level 40 6 6 Fault De...

Страница 4: ...e High Alarm Setpoint 53 6 11 4 Setting Hysteresis 54 6 12 Enable Disable Channels 55 7 CALIBRATION 55 7 1 Calibration Specifications 55 7 1 1 Gas 55 7 1 2 Regulators Flow 56 7 1 3 Adapters 56 7 1 4 C...

Страница 5: ...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 63 7 5 Calibrating an Oxygen Sensor 64 8 ACCESSORIES 66 8 1 Spl...

Страница 6: ...to instructions indicated in this manual This instrument should be inspected and calibrated regularly by a qualified and trained technician For more information refer to Section 7 Calibration and Sect...

Страница 7: ...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 All returned goods must...

Страница 8: ...er contact name shipping billing information and a description of the defect as you perceive it You will be contacted with a cost estimate for expected repairs prior to the performance of any service...

Страница 9: ...all wiring be within properly grounded earth or safety conduit 1 6 Revisions This manual was written and published by CETCI The manufacturer makes no warranty or representation expressed or implied in...

Страница 10: ...communicate with a Controller or Building Automation System BAS with Modbus RTU RS 485 serial communication Sensor configuration options include one two or three channel operation with a comprehensiv...

Страница 11: ...ngle or dual internal electrochemical sensor and or one remote catalytic combustible or PID TVOC sensor Modbus RTU RS 485 serial communication Graphic LCD display user selectable function Internal aud...

Страница 12: ...ce RF interference Weight 400 g 14 oz Size 127 mm x 127 mm x 71 mm 5 0 in x 5 0 in x 2 8 in ELECTRICAL Power Requirement 16 30 VDC 3 W Class 2 12 27 VAC 50 60 Hz 3 VA Class 2 24V recommended See Secti...

Страница 13: ...netic Sensors Use a magnetic wand to access menu options and initiate calibration without opening the enclosure Audible Alarm Standard internal buzzer rated 90 dB 10 cm enable disable INPUT OUTPUT Com...

Страница 14: ...XXX S N LPTM1603B00001 Rating 16 30 VDC 3W Class 2 12 27 VAC 50 60 Hz 3VA Class 2 CERTIFIED FOR ELECTRIC SHOCK ELECTRICAL FIRE HAZARD ONLY LA CERTIFICATION ACNOR COUVRE UNIQUEMENT LES RISQUES DE CHOC...

Страница 15: ...ormaldehyde CH2 O LPT M CH2O 0 5 0 ppm 2 years Hydrogen H2 LPT M EH2 0 2 000 ppm 2 years Hydrogen Cyanide HCN LPT M HCN 0 30 ppm 2 years Hydrogen Sulphide H2 S LPT M H2S 0 50 ppm 2 years Hydrogen Sulp...

Страница 16: ...A Remote Sensor Gas Types ESH A Remote Sensors Combustible Catalytic Hydrogen H2 ESH A CH2 100 0 100 LEL 5 years Methane CH4 ESH A CCH4 100 0 100 LEL 5 years Propane C3 H8 ESH A CC3H8 100 0 100 LEL 5...

Страница 17: ...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 NOTE During calibration the sensor response time will be slowe...

Страница 18: ...hts reserved Data subject to change without notice LPT M Operation Manual Rev B 2022 03 4 INSTRUMENT FEATURES 4 1 Exterior Enclosure Side view of LPT M showing location of Magnetic Sensors ARROW UP EN...

Страница 19: ...y opening and closing Display with green border Graphic LCD display Green border indicates transmitter operation is Modbus Magnetic Sensors arrow up Enter arrow down Use a magnetic wand to access menu...

Страница 21: ...ludes 120 ohm resistor TP1 and TP2 Test Points 1 and 2 to confirm voltage registers are working Reading should be 3 3 volts 5 INSTALLATION The sensor in the LPT M goes through a burn in period at our...

Страница 22: ...espan by following Step 1 in Section 7 5 Calibrating an Oxygen Sensor After a substantial warm up period an Ethylene Oxide sensor should be zeroed on site if the ambient temperature is above 22 C 71 6...

Страница 23: ...st Electrical Risks Disconnect all power before servicing There may be multiple power sources Power supply may have a building installed circuit breaker switch that is suitably located and easy to acc...

Страница 24: ...r electrical safety and provides an opening to allow the user to apply a padlock or tie wrap if they desire the transmitter to be locked See Section 4 1 Exterior Enclosure Be aware that the hinged doo...

Страница 25: ...ing their own installation holes will not be covered under warranty 5 5 2 EMI and RF Interference Considerations All electronic devices are susceptible to EMI Electromagnetic Interference and RFI Radi...

Страница 26: ...ing and gases which have a density close to that of air should have sensors installed in the breathing zone 4 6 f 1 2 1 8 m from the floor The breathing zone refers to the area 4 6 ft 1 2 1 8 m from t...

Страница 27: ...hts reserved Data subject to change without notice 27 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 M...

Страница 28: ...nections or from too much voltage applied is not covered under warranty All wiring should be run in EMT or better conduit properly earth grounded All communications network wiring must be in shielded...

Страница 29: ...ution in the conduit use stranded wire pigtails 18 AWG within the enclosure to connect to the circuit board The rigidity of solid core wire can pull a soldered terminal strip completely off a circuit...

Страница 30: ...ge 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 Grasp the two sid...

Страница 31: ...il 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 and normally closed NC terminals With...

Страница 32: ...to the LPT M that has the same serial number or the system won t work Four conductor 16 AWG stranded shielded cable is required for the remote sensor wiring This wiring should be run in a conduit sepa...

Страница 33: ...tions SUPPLY VOLTAGE RS 485 BUS IMPEDENCE WIRE GAUGE AWG MAXIMUM CABLE LENGTH 22 VDC minimum on board termination resistor available J5 low capacitance shielded wiring 18 AWG 601 m 2000 ft at 19 200bp...

Страница 35: ...ing to the gas readings alarm setpoints buzzer and relay configurations as outlined in this manual In the event of a gas build up in excess of the alarm setpoints the internal alarm will sound and the...

Страница 36: ...ctions in this manual are given using the magnetic wand to engage the magnetic sensors on the side of the enclosure However the same instructions can be followed when using the buttons inside the encl...

Страница 37: ...ault Test Audible Buzzer Program Relays Enable Disable Relays Relay ON OFF Delays YES NO Failsafe Relay Alarm Setpoints Low Med High Fault Test Relay Change Modbus ID Change Baud Rate 3032 Sensor Conf...

Страница 38: ...ut a correct reading will not show up until the unit has finished the warm up period and the sensor s has stabilized After the warm up period 3 minutes the device may exhibit gas alarm conditions if t...

Страница 39: ...ow alarm MID gas channel is in mid alarm HIGH gas channel is in high alarm FAULT gas channel is in fault COMM controller has been unable to communicate with the LPT for at least 300 seconds NOTE If th...

Страница 40: ...nd select Contrast Adjust Press ENTER to select Use the ARROW keys to enter a number between 00 and 35 The factory default contrast level is 20 6 6 Fault Detection The LPT M has built in fault detecti...

Страница 41: ...devices are configured with the same baud rate character format etc Each device will have its own unique Modbus ID Individual transmitters being added to an existing system may require changes to the...

Страница 42: ...pressing ENTER to save and Exit 6 7 3 Modbus Holding Registers If you have specific requirements have any questions or require clarification about the Modbus holding registers please contact CETCI fo...

Страница 43: ...passcode 1001 press either ARROW to scroll through the menu and select Program Audible Press ENTER to select Scroll through the menu and choose Audible Enable Press ENTER to choose between ON or OFF...

Страница 44: ...Factory default is 1 second To have no delay in sounding the buzzer enter 0000 6 8 3 Audible Alarm Level Assignment You can choose one level of alarm at which the buzzer will sound Choose from LOW MID...

Страница 45: ...arters The relay is SPDT single pole double throw thereby providing one set of usable dry contacts for the relay Because the LPT M system is designed to be fail safe any equipment to be controlled by...

Страница 46: ...nged until the time delay has expired at which time the relay will trip If the gas level falls below the set alarm level before the delay has finished the alarm will be cancelled and the delay will be...

Страница 47: ...the menu and choose Relay Delay OFF 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 scr...

Страница 48: ...9 4 Relay Alarm Level Assignment One level of alarm can be set to trigger the relay Choose from LOW MID HIGH or FAULT NOTE The LOW MID and HIGH setpoints of the alarm levels are configured in the Sen...

Страница 49: ...essing 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 th...

Страница 50: ...the relays were tested tripped they will remain so after testing for the duration of their respective OFF delay Refer to Section 6 9 2 Setting Relay ON OFF Delay 6 10 3 Test Gas Reading Response Send...

Страница 51: ...d the ENTER key to move to the next digit NOTE You will only be able to enter a value that falls within the factory configured range of the sensor If you try to enter a number outside that limit the v...

Страница 52: ...t refer to Section 6 11 4 Setting Hysteresis The setpoint is the level of the gas concentration at and above which the relay will be activated the buzzer will sound if enabled and the display will ind...

Страница 53: ...tarts out below the alarm setting and when the reading goes above it the alarm will trip A descending alarm is used when the normal gas level starts above the alarm setting and when the reading goes b...

Страница 54: ...all alarm setpoints on that channel For example if the alarm is set to come on at 100 ppm and the hysteresis is set for 5 ppm the alarm will not turn off until the gas is below 95 ppm This prevents t...

Страница 55: ...OFF Use the ARROW key to move on to the next menu item and ENTER to Exit 7 CALIBRATION 7 1 Calibration Specifications 7 1 1 Gas Calibration span gases should have at least 5 accuracy and have a curren...

Страница 56: ...as air CO O2 etc should be flowed at 0 5 LPM Gases heavier than air NO2 etc should be flowed between 0 5 and 1 0 LPM Fixed flow regulators provide more accuracy 7 1 3 Adapters The proper calibration a...

Страница 57: ...as Ozone O3 Chlorine Cl2 and Hydrogen Chloride HCl adhere to surfaces including tubing and splash guards When calibrating a sticky gas sensor we suggest using Teflon lined tubing so the gas doesn t a...

Страница 58: ...non intrusive calibration touch the magnet to one of the marks on the side of the enclosure and follow the screen prompts along with the instructions in this section NOTE The programming buttons insid...

Страница 59: ...emove the cylinder of zero gas Refer to Section 7 3 3 Zero Requires Override if the Zero calibration was not successful NOTE After 5 minutes of inactivity the display will return to the normal operati...

Страница 60: ...tion calibration may succeed but it does not mean the equipment has been calibrated properly CETCI is not responsible for improperly calibrated transmitters Follow manual instructions carefully When t...

Страница 61: ...hen try re inserting it If the splash guard is installed use the Cal Clip p n CET SGC NOTE Response time will be slower with the splash guard installed 7 3 2 Zero Calibration Shift If all that is desi...

Страница 62: ...a fault reading then either the LPT M has failed a previous calibration and cannot calculate the expected voltage or there has been a fault that the LPT M cannot correct for In either case all that ca...

Страница 63: ...nected to In the Sensor Configuration Menu passcode 3032 press either ARROW key to scroll through the menu and select the channel the ESH A is assigned to Follow the instructions in Section 8 2 Calibr...

Страница 64: ...nd close the ESH A Step 5 On the LPT M in the Sensor Configuration Menu passcode 3032 press either ARROW key to scroll through the menu and select the channel the ESH A has been assigned to Follow the...

Страница 65: ...g a cylinder attach the regulator to the cylinder of Oxygen and insert calibration adapter into the sensor opening on the front of the enclosure door see Section 7 3 1 Calibration Adapter Plug if the...

Страница 66: ...Zero Calibration will start when the flow of gas is detected When the process has finished and the Zero calibration was accepted press ENTER to Exit and remove the cylinder of Nitrogen gas Refer to Se...

Страница 67: ...e small barb hose fitting accommodates standard or Teflon tubing of 1 8 3 175 mm ID and 3 16 4 762 mm ID The Cal Clip must be removed during normal operation or else the gas readings will not be accur...

Страница 68: ...d mounting holes installation and removal for gas detector servicing is easy In applications where sticky gases are being monitored such as Ozone Chlorine Hydrogen Chloride etc and frequent wash downs...

Страница 69: ...res virtually no maintenance other than regular calibration of the sensor s There are no replaceable components except the sensors The transmitter should be monitored for possible damaging conditions...

Страница 70: ...he sensor LPT M powered up display appears normal but the control panel displays Fault Modbus output signal has not been connected properly Check the connections and refer to the Wiring Examples in Se...

Страница 71: ...on Menu passcode 3032 press either ARROW key to scroll through the menu and select the gas channel for which you want to see the diagnostic information Press ENTER and then the UP ARROW key to see thi...

Страница 72: ...09 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 www critical enviroment com SAFER AIR...

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