E+E EE371 Specifications

EE371

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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 congurable 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 Conguration

An optional adapter and the free EE-PCS Product Conguration Software facilitate easy conguration 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 certicate 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)

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EE371

EE371

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”)

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2

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2

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2

1

EE371

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