Page 1
EE371
80
60
40
20
0
-20
-40
-60
0
10
20 30
40
50 60
-10
-20
-30
-40
Compact Dew Point Sensor
The EE371 is dedicated for accurate and reliable monitoring of the dew
point temperature (Td) in the range -60...60 °C Td (-76...140 °F Td),
with pressure rating up to 100 bar (1 450 psi). It is ideal for compressed
air systems and industrial process control. Besides Td, the device
measures also frost point temperature (Tf) or volume concentration (Wv).
High Accuracy
The innovative, monolithic E+E HMC01 humidity and temperature
sensing element together with a sophisticated auto-calibration
procedure leads to accuracy better than ±2°C Td (±3.6 °F Td) and to
excellent long term stability.
Analog Outputs and Display
The measured data is available on two freely congurable voltage or
current outputs as well as on the LCD display.
Functional Design
The compact, robust metal enclosure, the swirling front-end and various process connections and sampling options allow
for easy and comfortable design-in, mounting and operation.
Easy Conguration
An optional adapter and the free EE-PCS Product Conguration Software facilitate easy conguration and adjustment of
the EE371.
Features
• Measuring range -60...60 °C Td (-76...140 °F Td)
• Accuracy of measurement ±2 °C Td (±3.6 °F Td)
• Autocalibration
• Pressure tight up to 100 bar (1 450 psi)
• 360° axial rotable enclosure
• Inspection certicate according
to DIN EN 10204 – 3.1
Autocalibration
Dew point temperatures in the range of -60...-20 °C (-76...-4 °F) at room temperature correspond to relative humidity
values of 0.08...5.37 % RH. The measurement of these low humidity values is not possible with conventional capacitive
measurement methods. For the EE371 a special autocalibration procedure is utilized to achieve high accuracy measurements at lowest dew points too.
Technical Data
Measurands
Dew point (Td)
Dew point sensor HMC01
Measuring range -60...60 °C Td
Accuracy 1) Traceable to intern. standards, administrated by NIST, PTB, BEV...
dew point temperature (°C)
Accuracy ≤ ±2 °C Td (≤ ± 3.6 °F)
Response time t
90
80 sec. -20 °C Td → -40 °C Td (-4 °F Td → -40 °F Td)
10 sec. -40 °C Td → -20 °C Td (-40 °F Td → -4 °F Td)
Volume concentration
Measuring range 20...20 000 ppm
Accuracy at 20 °C
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).
122
(68 °F) and 1 013 mbar (14.7 psi) ±(5 ppm + 9 % from measured value)
(-76...140 °F Td)
process temperature (°C)
v1.8 / Modification rights reserved
EE371
EE371
Page 2
Outputs
Two freely selectable and scaleable 0-1 V / 0-5 V / 0-10 V 1) -1 mA < IL < 1 mA
analogue outputs for Td, Tf, Wv 4-20 mA / 0-20 mA R
< 500 Ohm
L
1)
General
Supply voltage 10...30 V DC
Current consumption at 24 V DC voltage output: typ. 40 mA / during autocalibration: 100 mA
current output: typ. 80 mA / during autocalibration: 140 mA
Pressure range 0...20 bar
(0...290 psi) / 0...100 bar (0...1 450 psi)
Housing / protection class Al Si 9 Cu 3 / IP65
Electrical connection 7-pole industrial plug: DIN VDE 0627 / IEC 61984
wire cross-section: 0.25 - 1 mm
²
cable connection: PG 11
Sensor protection stainless steel sintered filter
Working temperature range probe: -40...70 °C
electronics: -40...60 °C
(-40...158 °F)
(-40...140 °F)
with LC display: -20...50 °C (-4...122 °F)
Storage temperature range -40...60 °C (-40...140 °F)
Electromagnetic compatibility EN61326-1 EN61326-2-3 ICES-003 ClassB
Industrial Environment FCC Part15 ClassB
1) minimum supply voltage 15V DC
Dimensions in mm (inch)
48 (1.9”)
32 (1.3”)
RL = load resistance
54 (2.1”)
28 (1.1”)
100 (4”)
75 (3”)
Sampling Cells
Basic Sampling Cell
The basic sampling cell is suitable for the pressure range 0...64 bar
(0...928 psi). It allows a simple installation of the dew point sensor into an
existing or self-constructed sampling system.
Sampling Cell with Quick Connector and Bleed Screw
The sampling cell is optimized for the pressure range 0...10 bar (0...145 psi).
The air ow can be adjusted with the bleed screw. The G ½” ISO version
features a quick connector suitable forstandard DN7.2 connection, which
allows for the sampling cell to be mounted and removed without process
interruption.
Sampling Cell for Atmospheric Dew Point
The sampling cell is optimized for measuring the athmoperic dew point
temperature of compressed air with pressure range 0...10 bar (0...145 psi). It
features a quick connector suitable for standard DN7.2 air connection, which
allows for the sampling cell to be mounted and removed without process
interruption. The pressure in the sampling cell can be set with by the needle
valve.
G1/2” ISO
∅12 (0.5”)
or 1/2” NPT
spanner width: 27 or 24
ISO NPT
1 = G 1/2“ or 1/2“
2 = G 1/4“ or 1/4“
3 = G 1/4“ or 1/4“
1 = G 1/2“ ISO
2 = Bleed screw
3 = Quick connector
1 = 1/2“ NPT
2 = Bleed screw
3 = 1/4” NPT
1 = G 1/2“ ISO
2 = Quick connector
HA050103 ISO
HA050105 NPT
3
HA050102
3
HA050107
3
HA050106
2
24 (1”)
40 (1.6”)
1
2
1
2
1
2
1
EE371
v1.8 / Modification rights reserved
123
Page 3
Ordering Guide
Pressure range
Pressure tight feedthrough
Hardware
Display
Output 1
Output 2
Type of output signal
Measured value units for Td / Tf
Software
1)
output
in °C or °F
1)
in °C or °F
Scaling range for Td outputs
Scaling range for Tf outputs
Scaling range for Wv
1) Other Td/Tf scalings refer to data sheet „Scaling of the outputs“ at www.epluse.com/EE371
2) Other measurement ranges upon request
2)
up to 20 bar
up to 100 bar
G1/2“ male thread
1/2” NPT thread
without display no code
with display D08
dew point temperature Td [°C/°F] C
frost point temperature Tf [°C/°F] D
volume concentration Wv [ppm] P
dew point temperature Td [°C/°F] C
frost point temperature Tf [°C/°F] D
volume concentration Wv [ppm] P
0-1 V 1
0-5 V 2
0-10 V 3
0-20 mA 5
4-20 mA 6
metric / SI no code
non metric / US E01
-40...60 Td02
-10...50 Td03
-60...20 Td65
-40...60 Tf02
-10...50 Tf03
-60...20 Tf65
0...100 ppm X01
0...500 ppm X02
0...1 000 ppm X03
(290 psi)
(1 450 psi)
EE371-T
E
I
HA03
HA07
Order Example
EE371-TEHA07D08CC3-Td02-Td02
Pressure range: up to 20 bar (290 psi)
Pressure tight feedthrough: 1/2” NPT thread
Display: with display
Output 1: dew point temperature [Td]
Output 2: dew point temperature [Td]
Output signal: 0-10 V
Measured value unit: metric
Scaling range output 1: -40...60 °C
Scaling range output 2: -40...60 °C
Accessories
- Basic sampling cell ISO HA050103
- Basic sampling cell NPT HA050105
- Sampling cell with quick connector HA050102
- Sampling cell with 1/4“ NPT HA050107
- Sampling cell for atmospheric dew point HA050106
- Product configuration adapter see data sheet EE-PCA
- Product configuration software EE-PCS
124
(free download: www.epluse.com/congurator)
v1.8 / Modification rights reserved
EE371
Loading...