COMET T5140 Programmable transmitter of CO2 concentration with 4-20 mA output Instruction Manual

COMET T5140 Programmable transmitter of CO2 concentration with 4-20 mA

output

General description

The transmitters are designed for the measurement of carbon dioxide concentration of air without aggressive ingredients.

• T5140 ambient CO2 transmitter with 4 – 20 mA output
• T5240 ambient CO2 transmitter with 0 – 10 V output
• T5141 CO2 transmitter with cable probe with 4 – 20 mA output
• T5241 CO2 transmitter with cable probe with 0 – 10 V output
• T5145 duct mount CO2 transmitter with 4 – 20 mA output
• T5245 duct mount CO2 transmitter with 0 – 10 V output

A multiple-point CO2 and temperature adjustment procedure leads to excellent CO2 measurement accuracy over the entire temperature working range; this is a must for process control and outdoor applications. The dual wavelength NDIR CO2 sensing procedure compensates automatically for aging effects. The CO2 module is highly resistant to pollution and offers maintenance-free operation and outstanding long-term stability. Measured values can be read in „SLOW mode“ (filtered, averaged) or in „FAST mode“ (current values without averaging). The SLOW mode has advantages in applications like climate control because of filtering short-time peaks. As an example exhaled air from an employee passing the sensor could affect the climate control negatively with a short response time because the control would trigger a change of the ventilation based on this one-time measurement. On the contrary in „FAST mode“ no software filter is used for calculating the output value. This fact adds a noise of typ. ±30ppm which has to be considered in terms of accuracy. Of principle, measurement is the measured value of CO2 concentration depends on the value of air pressure – altitude at the installation site. For this reason, it is suitable for accurate measurement to set the altitude of the installation site by TSensor software (is available to download free at www.cometsystem.com). Measured values are displayed on dual line LCD display. The visual indication of CO2 concentration is provided by three-color LED. After powering up of the device starts the internal test. During this time (about 20s) LCD display shows (—-) instead of CO2 concentration value. For the setting of all parameters of the transmitter serves the user program TSensor. Cable SP003 (optional accessory) use for connecting the device to a personal computer.
Device version TxxxxL with watertight male connector instead of a cable gland is designed for easy connection/disconnection of the output cable.
Models marked TxxxxZ are non-standard versions of the transmitters. The description is not included in this manual.

Factory settings

If special setting was not required in the order, the device is set from the manufacturer to the following parameters:

• 4 – 20 mA output: corresponds 0 to 2000 ppm (T5140 a T5145) corresponds 0 to 10 000 ppm (T5141)
• 0 – 10 V output: corresponds 0 to 2000 ppm (T5240 a T5245) corresponds 0 to 10 000 ppm (T5241) measurement mode: „SLOW“ display: switched ON
• LED indication: up to 1000 ppm lights green LED from 1000 ppm to 1200 ppm lights yellow LED over 1200 ppm lights red LED
• altitude: 300 m above sea level at the installation site

Modification of the setting is possible to do by means of the PC and TSensor program.

Device installation

The housing with electronics of the T5140 (T5240) or T5141 (T5241) transmitter is designed for wall mounting with two screws or bolts. The T5145 (T5245) transmitter installs by inserting the metal stem into the Pg21 cable gland so that the measured air was fed into the head of the device (see picture). To fasten the stem, it is also possible to use the flange PP4 or PP90 (see „Optional accessory”). The external CO2 probe unpacks and connects to the T5141 (T5241) device. Then place the probe into the measured environment. The connecting terminals are accessible after unscrewing the four screws in the corners of the case and removing the lid. Pass the connecting cable through the released gland and connect the wires to terminals (see „Typical application wiring”). By jumper, J1 selects galvanically or non-galvanically isolated output (T5140, T5141, and T5145). Tighten the gland and screw the lid (check the integrity of the seal). The female connector for connecting the TxxxxL transmitter connects according to the diagram at „Typical application wiring”. For device connection it is recommended to use a shielded cable with an external diameter 3.5 to 8 mm. Maximum cable length of the current loop is 1200 m, and maximum voltage output cable length is 15 m. The cable must be located at indoor rooms and should not be led in parallel along power cabling. Safety distance is up to 0.5 m, otherwise undesirable induction of interference signals can appear. For the TxxxxL device’s connection, it is recommended to use a cable with respect to the female connector specification. Do not connect shielding at the connector side

Warning

• Installation, commissioning and maintenance may only be carried out by personnel with qualification by applicable regulations and standards.
• Don´t connect transmitter while power supply voltage is on.

Modification of device adjustment

Device adjustment is performed by means of the optional SP003 communication cable, connected to the USB port of the PC. It is necessary to have installed the configuration program TSensor on the PC (the program is free to download at www.cometsystem.com). During installation, please take care of the installation of driver for USB communication:

• unscrew four screws of the device lid and remove the lid. If the device is already installed to the measuring system, disconnect wires from the terminals
• connect the SP003 communication cable to the PC. Installed USB driver to detect connected cable and create virtual COM port inside the PC
• run the installed TSensor program and continue in accordance with his instructions
• when new setting is saved and finished, disconnect the cable from the device, connect wires into its terminals and place the lid back to the device.

Info mode

Several settings of the installed transmitters are possible to verify without a use of the computer. It is necessary to connect power supply. Unscrew the transmitter lid and shortly press the button (the right of the terminal) by means of a tool (e.g. screwdriver). Upper line of the LCD display shows value of CO2 concentration corresponding to output current 4 mA (output voltage 0 V)

Press the button again to get value of CO2 concentration corresponding to output current 20 mA (output voltage 10 V).

Press the button again to end info mode and display actual measured values

Warning
During info mode, no measurement and no output current generation proceed. The transmitter stays at info mode 15 s, and then automatically goes back to the measuring cycle.

Error states of the device

The device continuously checks its state during operation. In case the error is found LCD displays the corresponding error code:

• Error 0 – the first line displays „Err0“ (output current value is < 3.8 mA). Check the sum error of the stored setting inside the device’s memory. This error appears if an incorrect writing procedure to the device’s memory occurred or if damage of calibration data appeared. At this state, device does not measure. It is a serious error, contact the distributor of the device to fix it.
• Error 2 – there is a reading „Err2“ on the LCD display. The CO2 concentration measurement error occurred.
• Error 3 – there is a reading „Err3“ on the LCD display upper line. An error of the internal A/D converter appeared (the converter does not respond, probably damage of A/D converter). This error does not affect CO2 concentration measurement. It is a serious error, contact the distributor of the device.
• Error 4 – there is a reading „Err4“ on the LCD display. It is an internal device error during the initialization of the CO2 sensor. Under this condition, device does not measure the concentration of CO2. Value read from the device is -9999. The CO2 sensor is probably damaged. It is a serious error, contact the distributor of the device.

Technical support and service

Technical and service is provided by the distributor. For contact see the warranty certificate. You can use the discussion forum at web address
www.forum.cometsystem.cz.

T5140 – ambient air CO2 transmitter

• Output: 4 to 20 mA
• Power: 9 to 30 V dc
• Power consumption: 1 W during normal operation max. 4 W (for 50 ms with 15 s period)
• Output in case of error: < 3.8 mA or > 24 mA
• The concentration of CO2:
• Accuracy: ± (50 ppm + 2 % of measuring value) (at temperature 25 °C and pressure 1013 hPa)
• Range: 0 to 2 000 ppm
• Temp. dependence: Typ. 2 ppm / °C in the range -20 to 45 °C
• Long-term stability: typ. 20 ppm/year
• Resolution: 1 ppm
• Response time: t90 < 105 s in “SLOW” measurement mode t90 < 60 s in “FAST” measurement mode

T5240 – ambient air CO2 transmitter

• Output: 0 to 10 V
• Power: 15 to 30 V dc
• Power consumption: 0.5 W during normal operation max. 3 W (for 50 ms with 15 s period)
• Output in case of error: < -0.1 V or > 10.5 V
• The concentration of CO2:
• Accuracy: ± (50 ppm + 2 % of measuring value) (at temperature 25 °C and pressure 1013 hPa)
• Range: 0 to 2 000 ppm
• Temp. dependence: typ. 2 ppm / °C in the range -20 to 45 °C
• Long-term stability: typ. 20 ppm/year
• Resolution: 1 ppm
• Response time: t90 < 105 s in “SLOW” measurement mode t90 < 60 s in “FAST” measurement mode

T5141 – CO2 transmitter with external probe

• Output: 4 to 20 mA
• Power: 9 to 30 V dc
• Power consumption: 1 W during normal operation max. 4 W (for 50 ms with 15 s period)
• Output in case of error: < 3.8 mA or > 24 mA
• The concentration of CO2:
• Accuracy: ± (110 ppm + 5 % of measuring value) (at temperature 25 °C and pressure 1013 hPa)
• Range: 0 to 10 000 ppm
• Temp. dependence : ± (1 + CO2 concentrate [ppm] / 1000) ppm / °C (in the range -20 to 45 °C)
• Long-term stability: typ. 20 ppm/year
• Resolution: 1 ppm
• Response time: t90 < 105 s in “SLOW” measurement mode t90 < 60 s in “FAST” measurement mode

T5241 – CO2 transmitter with external probe

• Output: 0 to 10 V

• Power: 15 to 30 V dc

• Power consumption: 0.5 W during normal operation
  max. 3 W (for 50 ms with 15 s period)

• Output in case of error: < -0.1 V or > 10.5 V

• The concentration of CO2:

• Accuracy: ± (110 ppm + 5 % of measuring value)
  (at temperature 25 °C and pressure 1013 hPa)

• Range: 0 to 10 000 ppm

• Temp. dependence: ± (1 + CO2 concentrate [ppm] / 1000) ppm / °C (in the range -20 to 45 °C)

• Long-term stability: typ. 20 ppm/year

• Resolution: 1 ppm

• Response time: t90 < 105 s in “SLOW” measurement mode t90 < 60 s in “FAST” measurement mode

T5145 – CO2 duct mount transmitter

• Output: 4 to 20 mA
• Power: 9 to 30 V dc
• Power consumption: 1 W during normal operation max. 4 W (for 50 ms with 15 s period)
• Output in case of error: < 3.8 mA or > 24 mA
• The concentration of CO2:
• Accuracy: ± (50 ppm + 2 % of measuring value) (at temperature 25 °C and pressure 1013 hPa)
• Range: 0 to 2 000 ppm
• Temp. dependence: typ. 2 ppm / °C in the range -20 to 45 °C
• Long-term stability: typ. 20 ppm / year
• Resolution: 1 ppm
• Response time: t90 < 105 s in “SLOW” measurement mode t90 < 60 s in “FAST” measurement mode

T5245 – CO2 duct mount transmitter

• Output: 0 to 10 V
• Power: 15 to 30 V dc
• Power consumption: 0.5 W during normal operation max. 3 W (for 50 ms with 15 s period)
• Output in case of error: < -0.1 V or > 10.5 V
• The concentration of CO2:
• Accuracy: ± (50 ppm + 2 % of measuring value) (at temperature 25 °C and pressure 1013 hPa)
• Range: 0 to 2 000 ppm
• Temp. dependence: typ. 2 ppm / °C in the range -20 to 45 °C
• Long-term stability: typ. 20 ppm/year
• Resolution: 1 ppm
• Response time: t90 < 105 s in “SLOW” measurement mode
• rozsah: 0 až 2 000 ppm

General

Protection:

• IP30 T5140(L), T5240(L)
• IP65 (device with probe) T5141(L), T5241(L)
• IP20 T5145(L), T5245(L)

The recommended interval of calibration:

• year

Working position:

• cable gland upwards T5140(L), T5240(L)
• any position T5141(L), T5241(L)
• any position *) T5145(L), T5245(L)

The holes on the stem must be routed in the direction of the air flow, see chapter “Device installation”

Electromagnetic compatibility:

• EN 61326-1

Storage temperature range:

• -40 to +60 °C

Storage relative humidity range:

• 5 to +95 °C

Storage atmospheric pressure range:

• 700 to 1100 hPa

Cable length of probe:

• 1 m, 2 m or 4 m T5141(L), T5241(L)

Weight: approximately

• T5140(L), T5240(L) 150 g
• T5141(L), T5241(L) 1m probe 250 g
• T5141(L), T5241(L) 2m probe 280 g
• T5141(L), T5241(L) 4m probe 340 g
• T5145(L), T5245(L) 260 g

Housing material:

• ASA

Operation conditions

Operating temperature range of housing with electronics:

• 30 to +60 °C T5140(L), T5240(L), T5145(L), T5245(L)
• -30 to +80 °C T5141(L), T5241(L)

It is recommended to switch off the LCD display at ambient temperatures above 70 °C.
Operating temperature range of the measuring end of the stem:

• 30 to +60 °C T5145(L), T5245(L)
  Operating temperature range of CO2 probe:

• 40 to +60 °C T5141(L), T5241(L)
  Operating relative humidity range:

• 5 to 95 %RH T5140(L), T5240(L), T5145(L), T5245(L)

• 0 to 100 %RH (no condensation) T5141(L), T5241(L)
  Operating pressure range:

• 850 to 1100 hPa

End of operation
Dispose of the device according to statutory regulations.

Dimensions

Typical application wiring

A device with 4-20 mA output can be connected to the circuitry by means of the galvanically isolated or galvanically non-isolated current loop. Output 0 – 10 V is galvanically non-isolated.

Galvanically isolated 4 – 20 mA output

Loop resistance value Rc = R + resistance of wires shall fulfill the condition Rc[Ω] < 40 x Uss2[V] – 360.

Galvanically non-isolated 4 – 20 mA output

Loop resistance value Rc = R + resistance of wires shall fulfill the condition Rc[Ω] < 40 x Uss1[V] – 360.

Galvanically nonisolated 0 – 10 V output

The value of the internal resistance (Ri) of the measuring instrument must be greater than 20 kΩ.

Optional accessory

Mounting flange PP4

Mounting flange PP90

© Copyright: COMET SYSTEM, s.r.o.
It is prohibited to copy and make any changes in this manual, without the explicit agreement of company COMET SYSTEM, s.r.o. All rights reserved. COMET SYSTEM, s.r.o. makes constant development and improvement of their products. The manufacturer reserves the right to make technical changes to the device without previous notice. Misprints reserved. The manufacturer is not responsible for damages caused by using the device in conflict with this manual. Damages caused by using the device in conflict with this manual can not be provided for free repairs during the warranty period. Read carefully instruction manual before the first device connection. Contact address of this device’s producer:
COMET SYSTEM, s.r.o.
Bezrucova 2901
756 61 Roznov pod Radhostem
Czech Republic
www.cometsystem.com

References

• Manufacturer of Dataloggers, Thermometers, Hygrometers,CO2 meters
• Comet system forum

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