Comet T3110 User manual

T3110 TRANSMITTER
Programmable transmitter of temperature, relative humidity
and other derived humidity values
with 4-20 mA outputs
Instruction Manual

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Instruction manual for use of T3110 transmitter
Transmitter is designed for measurement of ambient air temperature at °C or °F 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.
Measuring temperature and relative humidity sensors are non-removable instrument parts. 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. Transmitter is connected to circuitry by means of one or two galvanic
isolated loops. Each loop has two-wire connection and each loop requires power from evaluation
device. It is always necessary to connect current loop I1 for proper transmitter function (from loop
I1 part of the transmitter is powered). If current loop I1 is opened or disconnected, then loop I2 and
LCD will not work. It is possible to assign measured or computed value to current loop output I1 or
output I2 (both two-wire connection). Please read instruction manual before the first device
connection.
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 current loop output
measure value (temperature, relative humidity, computed value) and its range. It supports make the
adjustment of the device too. This procedure is described at file „Calibration manual.pdf“ which is
installed commonly with the software. It is also possible to assign both outputs to the same value
(with the same range), if two evaluation devices are necessary to connect.
Device setting from the manufacturer
Transmitter is set from the manufacturer to the following parameters:
value at output I1: relative humidity, range 4 – 20 mA corresponds 0 to 100 % RH
value at output I2: temperature, range 4 – 20 mA corresponds -30 to +80 °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 is designed for wall mounting. There are two mounting holes at the sides of the
case. It is NOT recommended to use the device 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. 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 1200m. The cable must be located at indoor rooms

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(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.
Electrical system (wiring) may do only worker with required qualification by rules in operation.
Dimensions
Typical application wiring
Calculation of minimum power voltage Uss for proper
operation:
Uss min> Uo min + Imax * Rz,
where: Uo min= 9 V
Imax... approximately 20 mA
Rz... sensing resistor (shunt)
Both current loops (I1 and I2) are connected analogically,
current loop I1 must be always connected.
LCD Info mode
Several settings of installed transmitter is possible to verify without a use of the computer. It is
necessary to connect at least power of current loop I1.
Unscrew the transmitter lid and shortly press button between display and interconnection
terminals by means of a tool (e.g. screwdriver).

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Range and type of value for output 1 (current loop I1 = symbol „1“on
display). Type of value, assigned to output 1, is indicated by displayed unit
(here %RH = relative humidity). Upper line displays current value
corresponding to measured value (lower line). Here 4 mA corresponds to
0 %RH
Press button again to get value for upper point (same output, same value)
similarly as at previous point. Here 20 mA 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 4 mA corresponds to
-30 °C.
After next press of the button value for upper point appears, here 20 mA
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 current generation proceed. The
transmitter stays at info mode 15 s and then automatically goes back to measuring cycle.
Readings on LCD display
°C, °F
Reading next to this symbol is measured temperature or error state of value.
%RH
Reading next to this symbol is measured relative humidity or error state of value.
°C / °F DP
Reading next to this symbol is calculated dew point temperature or error state of value.
g/m
3
Reading next to this symbol is calculated absolute humidity or error state of value.
g/kg
Reading next to this symbol is calculated specific humidity or mixing ratio (depends on device
setting) or error state of value.
If specific enthalpy is selected, there is shown only value (number) without corresponding unit!

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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 galvanic isolated current loops with range from 4 to 20 mA
Current output in case of error: <3.8 mA or >24 mA
Power: 9 to 30 V dc, maximum ripple 0.5 %
Measuring parameters:
Ambient temperature (internal RTD sensor Pt1000/3850ppm):
Measuring range: -30 to +80 °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
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/m
3
at ambient temperature T < 40°C
Range: 0 to 400 g/m
3
Specific humidity
1
Accuracy: ±2g/kg at ambient temperature T < 35°C
Range: 0 to 550 g/kg
Mixing ratio
1
Accuracy: ±2g/kg at ambient temperature T < 35°C
Range: 0 to 995 g/kg
Specific enthalpy
1
Accuracy: ± 3kJ/kg at ambient temperature T < 25°C
Range: 0 to 995 kJ/kg
2
Response time (air flow approximately 1 m/s):
temperature (temperature step 20°C):
with stainless steel mesh sensor cover (F5200) t90 < 7 min
with bronze sensor cover (F0000) t90 < 9 min (selectable option)
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
1
This 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.
2
This maximum is reached under conditions about 70°C/100%RH or 80°C/70%RH

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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: -30 to +80 °C, over +70°C switch LCD display OFF
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: the stem downwards
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: 89 x 73 x 37 mm, stem length 75 mm
Weight: approximately 115 g
Material of the case: ABS
Procedure of modification of transmitter adjustment:
•device adjustment is performed by means of the optional SP003 communication cable,
connected to USB port of the PC.
•It is necessary to have installed configuration program Tsensor on the PC, It is free to
download at www.cometsystem.cz. During installation please take care about
installation of driver for USB communication cable
•Connect SP003 communication cable to the PC. Installed USB driver detect connected
cable and create virtual COM port inside the PC.
•Unscrew four screws of the device lid a remove the lid. If device is already installed to
measuring system, disconnect leads from terminals
•Connect SP003 communication cable to the device. Display must light up, or at least
must light up all symbols for one second (if LCD was switched OFF by program
before).
•Run installed Tsensor program and select corresponding communication COM port (as
described above).
•When new setting is saved and finished, disconnect the cable from the device, connect
leads into its terminals and place the lid back to the device.

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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. Output value is < 3.8 mA. 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. Output value is about 24.5 mA. 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. Output value is about 3.8 mA. 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. Output value is about
3.8 mA. 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.

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Notes: