Comet T0211 User manual

T0211 TRANSMITTER
Programmable transmitter of temperature, relative humidity
and other derived humidity values
with 0 to 10 V outputs
Instruction Manual

2 IE-SNC-T0211-01
Instruction manual for use of T0211 transmitter
Transmitter is designed for measurement of air temperature and relative humidity of air without
aggressive ingredients with computing one of the following values: dew point temperature, absolute
humidity, specific humidity, mixing ratio and specific enthalpy. Instrument is equipped with an
external humidity and temperature probe on a cable. The probe is a non-removable instrument part.
Measured and computed values are displayed on dual line LCD display. The first line displays
temperature. Value displayed on the second line is selectable among relative humidity and
computed value. It is also possible to display both readings with cyclic overwriting in 4 seconds
interval. It is possible to switch OFF the LCD at all. It is possible to assign measured or computed
value to output Uout1 or output Uout2. Both voltage outputs have common ground with power
source (GND terminal).
All transmitter setting is performed by means of the PC connected via the optional SP003
communication cable (not included in delivery). Program Tsensor for transmitter setting is available
to download free at www.cometsystem.cz. Program enables to assign each output measured value
(temperature, relative humidity, computed value) and its range. It is also possible to assign both
outputs to the same value (with the same range), if two evaluation devices are necessary to connect.
Transmitter setting before operation
Transmitter is set from the manufacturer to the following parameters:
value at output Uout1: relative humidity, range 0 - 10 V corresponds 0 to 100 % RH
value at output Uout2: temperature, range 0 - 10 V corresponds -30 to +105 °C
display: switched ON
value displayed at line 2: relative humidity only
Modification of the setting is possible to do by means of the PC using procedure described at
the end of this document.
Installation of the transmitter
Transmitter case with electronics is designed for wall mounting. It is NOT recommended to
use the probe for long time under condensation conditions. It could be the cause of water steam
condensation inside the sensor’s cover into water phase. This liquid phase stays inside sensor’s
cover and can’t escape from the cover easily. It can dramatically increase response time to relative
humidity change. If water condensation occurs for longer time it can cause sensor damage. Similar
effect can occur under water aerosol conditions. If this effect may occur, it is necessary to use the
probe at operation position with sensor cover downwards. Don’t connect transmitter while power
supply voltage is on. Interconnection terminals are accessible after unscrewing four screws and
removing the lid. Lace the cable through a gland at the case wall. Connect the cable to terminals
with respecting the signal polarity (see figure). Terminals are self-clamping and can be opened by a
suitable screwdriver. For the opening, insert the screwdriver to upper terminal hole and lever by
him. Do not remember to tighten glands and case lid with inserted packing after cables connecting.
It is necessary for warranting of protection IP65.
It is recommended to use shielded copper cable (e.g. SYKFY) with outside diameter of the
cable must be from 3.5 to 8 mm, maximal length 15m. The cable must be located at indoor rooms
(probe is not protected for outdoor use). The cable 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.

IE-SNC-T0211-01 3
Typical application wiring
Maximum load current of each voltage output is 0.5 mA
LCD Info mode
Several settings of installed transmitter is possible to verify without a use of the computer. It is
necessary to connect power.
Unscrew the transmitter lid and shortly press button between display and interconnection
terminals by means of a tool (e.g. screwdriver).
Range and type of value for output 1 (Uout 1 = symbol „1“on display). Type of
value, assigned to output 1, is indicated by displayed unit (here %RH = relative
humidity). Upper line displays voltage value corresponding to measured value
(lower line).

4 IE-SNC-T0211-01
Press button again to get value for upper point (same output, same value)
similarly as at previous point. Here 10 V corresponds to 100 %RH.
Press button again to display range and type of value for output 2 (symbol „2“).
Here it is ambient temperature („°C“), when 0 V corresponds to -30 °C. If dew
point temperature would be assigned to output 2, displayed symbols are „°C“
and „DP“, for the rest values is shown only number (without corresponding
unit).
After next press of the button value for upper point appears, here 10 V
corresponds to ambient temperature +80 °C.
Press button again to end info mode and display actual measured values.
Notice: during info mode no measurement and no output voltage generation proceed. The
transmitter stays at info mode 15 s, and then automatically goes back to measuring cycle.
Technical parameters:
Accuracy data shown are for value displayed on LCD display. For value on analog output is
valid too, if selected output range is set inside measuring range.
Analog outputs:
Two outputs with range from 0 to 10 V with common ground
Output load capability: min. 20 kΩ
Voltage output in case of error: approximately –0.1 V or >10.5 V
Power: 15 to 30 V dc, maximum ripple 0.5 %, maximum load 20mA
Measuring parameters:
Ambient temperature (internal RTD sensor Pt1000/3850ppm):
Measuring range: -30 to +105 °C
Display resolution: 0.1 °C
Accuracy: ± 0.4 °C
Relative humidity (RH reading is compensated at the entire temperature range):
Measuring range: 0 to 100 %RH (see Installation of the transmitter)
Display resolution: 0.1 %RH
Accuracy: ± 2.5 %RH from 5 to 95 %RH at 23 °C

IE-SNC-T0211-01 5
Measuring temperature and humidity range is limited in accordance with the graph
below!
The value computed from ambient temperature and relative humidity:
Display resolution: 0,1 °C
You can choice one of the next value:
Dew point temperature
Accuracy: ±1,5 °C at ambient temperature T < 25°C and RH >30%
Range: -60 to +80 °C
Absolute humidity
Accuracy: ±3g/m3at ambient temperature T < 40°C
Range: 0 to 400 g/m3
Specific humidity1
Accuracy: ±2g/kg at ambient temperature T < 35°C
Range: 0 to 550 g/kg
Mixing ratio1
Accuracy: ±2g/kg at ambient temperature T < 35°C
Range: 0 to 995 g/kg
Specific enthalpy1
Accuracy: ± 3kJ/kg at ambient temperature T < 25°C
Range: 0 to 995 kJ/kg 2
Response time with stainless steel mesh sensor cover (F5200B) and bronze sensor cover
(F0000 - selectable option), air flow approximately 1 m/s:
temperature: t90 < 6 min (temperature step 20 °C)
relative humidity: t90 < 30 s (humidity step 65 %RH, constant temperature)
Recommended interval of calibration: 1 year
Measuring interval and LCD display refresh: 0.5 s
1This value depends on the atmospheric pressure. For computing is used constant value stored
inside device memory. Default value preset by manufacturer is 1013hPa and can be changed by
user’s software.
2This maximum is reached under conditions about 70°C/100%RH or 80°C/70%RH

6 IE-SNC-T0211-01
Communication with computer: via USB port by means of USB communication cable
SP003
Protection: electronics IP65, sensors are located in cover with IP40 protection
Air filter: filtering ability 0.025 mm
Operating conditions:
Operating temperature range of case with electronics: -30 to +80 °C, over +70°C switch
LCD display off
Operating temperature range measuring tip with sensors: -30 to +105 °C
Operating humidity range: 0 to 100 %RH
Outer characteristics in accordance with EN 33-2000-3:
normal environment with the specifications: AE1, AN1, BE1
Working position: negligible (see Installation of the transmitter)
Electromagnetic compatibility: complies EN 61326-1
Not allowed manipulations:
It is not allowed to operate the device under other than specified conditions in technical
parameters. Devices are not designed for locations with chemically aggressive environment.
Temperature and humidity sensors must not be exposed to direct contact to water or other
liquids. It is not allowed to remove the sensor cover to avoid any mechanical damage of the
sensors.
Storing conditions: temperature -30 to +80 °C, humidity 0 to 100 %RH without
condensation
Dimensions: the case with electronics 89 x 73 x 37 mm, external probe: ∅18 mm, length
approximately 90 mm, standard cable length 1 m
Weight: approximately 115 g
Material of the case: ABS
Procedure of modification of transmitter adjustment:
•Transmitter adjustment is performed by means of the optional SP003 communication
cable, connected to USB port of the PC.
•It is necessary to have installed driver for USB communication cable and configuration
program Tsensor on the PC
•Connect the SP003 cable to USB port of the PC. Installed driver detects the cable and
creates virtual COM port in the PC
•Run program Tsensor, select English version and select proper communication port (see
previous point)
•Unscrew four screws of the transmitter lid a remove the lid. If transmitter is already
installed to measuring system, disconnect leads from terminals
•Connect SP003 communication cable to the transmitter connector. Display must light
up, or at least must light up all symbols for one second (if LCD was switched OFF by
program before).
•Click on button „Connect“ and perform new transmitter adjustment. Analog output
range of the transmitter is possible to set for ambient temperature from –200 to
+600 °C, for humidity from 0 to 100 %RH, for dew point temperature from -200 to
+200 °C, for the rest values anything inside its own range. Difference between output
range limits must be minimally 30.
•Click on button Save to store new setting to the transmitter. Click on button Disconnect
to let transmitter setting without changes.
•Disconnect the cable from the transmitter and place the lid back to the transmitter.

IE-SNC-T0211-01 7
Error States of the device
Device continuously checks its state during operation. In case error is found LCD displays
corresponding error code:
Error 0
First line displays „Err0“.
Check sum error of stored setting inside device’s memory. This error appears if incorrect
writing procedure to device’s memory occurred or if damage of calibration data appeared. At this
state device does not measure and calculate values. It is the serious error, contact distributor of the
instrument to fix.
Error 1
Measured (calculated) value is over upper limit of allowed full scale range. There is a reading
„Err1“ on LCD display. This state appears in case of:
•Measured temperature is higher than approximately 600°C (i.e. high non-measurable
resistance of temperature sensor, probably opened circuit).
•Relative humidity is higher than 100%, i.e. damaged humidity sensor, or humidity
calculation of humidity is not possible (due to error during temperature measurement)
•Computed value – calculation of the value is not possible (error during measurement of
temperature or relative humidity or value is over range)
Error 2
There is a reading „Err2“ on LCD display. Measured (calculated) value is below lower limit
of allowed full scale range. This state appears in case of:
•Measured temperature is lower than approximately -210°C (i.e. low resistance of
temperature sensor, probably short circuit).
•Relative humidity is lower than 0%, i.e. damaged sensor for measurement of relative
humidity, or calculation of humidity is not possible (due to error during temperature
measurement)
•Computed value – calculation of computed value is not possible (error during measurement
of temperature or relative humidity)
Error 3
There is a reading „Err3“ on LCD display upper line.
Error of internal A/D converter appeared (converter doe not respond, probably damage of
A/D converter). No measurement and calculations of values are proceeded. It is a serious
error, contact distributor of the instrument.
End of operation
Device itself (after its life) is necessary to liquidate ecologically!
Technical support and service
Technical support and service is provided by distributor. For contact see warranty
certificate.

8 IE-SNC-T0211-01
Notes: