Datasheet

118
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EE355
The compact EE355 Dew Point Transmitter with a measuring
range down to -60 °C Td is ideal for applications in compressed
air systems, plastic dryers and industrial drying processes. An
integrated auto-calibration procedure permits a measurement
accuracy of <2 °C Td.
The measured values for dew point, frost point or ppm volume
concentration are available on an analog 4-20 mA and a digital
Modbus RTU output. Integration into the measurement task is
simplied by the compact design and the exceptionally robust
stainless steel housing.
With an optional Modbus to USB converter and the free EE-
PCS conguration software the user can adjust the transmitter,
set the Modbus parameters, and change the scaling of the
analog output.
EE355
OEM Dew Point Transmitter
down to -60 °C Td
EE355
Measuring values
Dew point (Td)
Measurement range -60...60 °C Td (-76...140 °F Td)
Accuracy
1)
Response time t
90
< 5 min -20 °C Td ( -4 °F Td) → -60 °C Td ( -76 °F Td)
< 15 sec -60 °C Td ( -76 °F Td) → -20 °C Td ( -4 °F Td)
Volume concentration (ppm)
Measurement range 20...200,000 ppm
Accuracy at 20 °C (68 °F) and 1013mbar ±(5 ppm + 9 % from measured value)
Output
Analog output (scalable) 4 - 20 mA (3-wire technology) RL < 500 Ohm
Maximum adjustable scaling -100...80 °C Td (-148...176 °F Td)
Resolution of analog output 2 µA
Digital interface MODBUS RTU (max. 32 units in one bus)
Temperature dependence ±5ppm of the measuring span / °C
(Deviating from 20 °C)
General
Supply voltage 18...28 V DC
Current consumption at 24V DC <20 mA + load current /
with autocalibration: 100 mA + load current
Pressure range of use 0...80 bar
Housing / protection class Stainless steel 1.4404 (AISI 316L) / IP65
Electrical connection
2)
M12x1 5-pin plug
Sensor protection Stainless steel sintered filter
Temperature / humidity operating range -40...70 °C (-40...158 °F) / 0...100 % RH
Storage temperature range -40...60 °C
(-40...140 °F)
Electromagnetic compatibility EN61326-1 EN61326-2-3 Industrial environment
FCC Part 15 ICES-003 ClassB
1) The accuracy statement includes the uncertainty of the factory calibration with an enhancement factor k=2 (2-times standard deviation). The accuracy was calculated in
accordance with EA-4/02 and with regard to GUM (Guide to the Expression of Uncertainty in Measurement).
2) Field-attachable mating connector is included in the scope of supply.
80
60
40
20
0
-20
-40
-60
0
10
20 30
40
50 60
-10
-20
-30
-40
80
60
40
20
0
-20
-40
-60
-80
0
10
20 30
40
-10
-20
-30
-40
6050
Dew point temperature (°C)
Medium temperature (°C)
Accuracy: ≤ ±2°C Td
Technical Data
EE355