Atal TRA-102ND-E User manual
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PRODUCT DESCRIPTION
The transmitter TRA-102ND-E with 4-20 mA outputs is designed to
measure air temperature and relative humidity in chemically non-
aggressive environments.
The transmitter communicates by two galvanically separated current
loop 4-20mA. Each loop has two-wire connection and each loop requires
power from evaluation device. It is always necessary to connect loop I1,
which supplies power to measurement part of the device.
DEVICE INSTALATION
Devices are designed for wall mounting. There are two mounting holes
at the sides of the case. Working position is with sensor cover
downwards.
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 released gland and
connect the wires to terminals (for
device connection it is recommended
to use a shielded cable with
maximum length of 1200m and with
external diameter of 4 to 8 mm).
Finally tighten the gland and screw
the lid (check the integrity of the seal).
The loop resistance value Rc = Rm + resistance of wires shall fulfill the
condition Rc[Ω] < 40 x Uss[V] –360.
It is not recommended to use the device for long time under
condensation conditions or water aerosol conditions. It could be the
cause of water steam condensation inside the sensor’s cover with a
consequential increase of response time to humidity changes. It can
cause sensor damage too.
Devices don´t require special operation and maintenance. It is
recommended keep the sensor cover clean and periodically to verify the
accuracy of measurement.
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WARNING
Don´t use and don’t store the device without a sensor cover.
Don´t connect transmitter while power supply voltage is on.
The cables should be located as far as possible from potential
interference sources.
Installation, commissioning and maintenance may only be carried out
by personnel with qualification by applicable regulations and
standards.
DIMENSIONS
MEASURED VALUES
Temperature:
Accuracy: ±0.6 °C
Measuring range: -30 to +80 °C
Resolution: 0.1 °C
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Response time: t90 < 7 min (temperature step 20 ºC)
Relative humidity:
Accuracy: ±3.0 %RH from 5 to 95 %RH at 23 °C
Measuring range: 0 to 100 %RH
Resolution: 0.1 %RH
Response time: t90 < 30 s (humidity step 65 %RH, constant
temperature)
GENERAL
Power supply voltage: 9 to 30 Vdc
Current output
in case of error: < 3.8 mA or > 22 mA
Recommended
calibration interval: 1 year
(relative humidity 1 year, temperature 2 years)
Protection: housing with electronics IP65, sensors are
located in cover with IP40 protection
Storage temperature range: -30 to +80 °C
Storage humidity range: 5 to 95 %RH (no condensation)
Working position: cable gland upwards
Electromagnetic
compatibility: EN 61326-1
Weight: approximately 150 g
Housing material: ABS
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OPERATING CONDITIONS
Temperature operating range: -30 to +80 ºC
Relative humidity operating range: 0 to 100 %RH
CALCULATION OF THE MEASURED VALUES
Temperature: T[°C] = 6.875 x I[mA] –57,5
Relative humidity: RH[%RH] = 6.25 x I[mA] - 25
END OF OPERATION
Disconnect the device and dispose it according to current legislation for
dealing with electronic equipment.
TECHNICAL SUPPORT AND SERVICE
Technical support and service is provided by distributor.
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