Item # Easidew PRO I.S., Easidew PRO I.S. Dew-Point Transmitters on Michell Instruments, Inc. Michell Instruments, Inc. - Item # Easidew PRO I.S., Easidew PRO I.S. Dew-Point Transmitters
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Easidew PRO I.S. Dew-Point Transmitters
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Easidew PRO I.S. Dew-Point Transmitters

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The Easidew PRO I.S. is a rugged intrinsically safe 2-wire dew point transmitter for trace moisture measurement in liquids and gases. It is certified for use in IS Class 1 Div 1 Groups A, B, C and D, EXII 1G EX ia IIC T4 and I.S. I 1 ABCD T4 (Ta = +60ºC) hazardous area locations. The Easidew Pro I.S. is easy to install and operate. It requires a 12 to 28 V DC supply and provides a linear 4-20 mA signal representing moisture content.



Specifications · Performance · Electrical Input/Output · Operating Conditions · Mechanical Specification · Highlights · Simple Operation · Moisture in Gases · Moisture in Liquids

Specifications

Measurement Range (Dew Point)

-100 to +20 ºC
-148 to +68 ºF

Performance

Accuracy (Dew Point)

±1 ºC (±1.8 ºF) dp (+20 to -60 ºC (+68 to -76 ºF))
±2 ºC (±3.6 ºF) dp (-60 to -100 ºC (-76 to -148 ºF))

Response Time

5 mins to T95 (dry to wet)

Repeatability

0.5ºC (0.9ºF) dew point

Electrical Input/Output

Output Signal

4-20 mA (2-wire connection, current source)
User configurable over range

Output

Dew point, moisture content for ppmV, ppmW

Output Range

Dew point: -100 to +20ºC (-148 to +68ºF)
Moisture content in gas: 0-3000 ppmV
Moisture content in liquid: 0-3000 ppmW

Supply Voltage

12-28 VDC

Maximum Load Resistance

250 Ω @ 12 V
500 Ω @ 24 V

Maximum Current Consumption

23 mA depending on output signal

Saturation Constants1

6-point look-up table for saturation constants up to 3000 ppmW over the temperature range 0 to +50ºC.
Saturation constants for 8 common liquids can be programmed into the Easidew PRO I.S. via the application software. Alternatively the user can program saturation constants manually.
1 For Moisture In Liquids Measurements Only


Operating Conditions

Operating Humidity

0-100% RH

Operating Temperature

-40 to +60 ºC
-40 to +140 ºF

Maximum Operating Pressure

45 MPa
450 barg
6500 psig

Flow Rate

1 to 5 Nl/min (2.1 to 10.5 scfh) mounted in sampling block; 0 to 10 m/sec (0 to 32.8 fps) direct insertion

Mechanical Specification

Hazardous Area Certificates

ATEX - Ex II 1G EX ia IIC T4
FM - I.S. I 1 ABCD T4 (Ta = +60ºC)
CSA - IS Class 1 Div 1 Groups ABCD T4
IECEx - EX ia IIC T4 (-20ºC ≤ Ta ≤ +60ºC)

Ingress Protection

IP66 in accordance with standard BS EN 60529:1992, and NEMA 4 in protection accordance with standard NEMA 250-2003

Housing Material

Stainless steel

Filter

80 µm sintered guard
HDPE Guard < 10 µm (optional)

Mounting Thread

5/8" - 18 UNF

Weight

1.27 kg
2.8 lb

Electrical Connections

Screw terminal, M20 x 1.5 mm

Fault Conditions (Factory Programmed)

Condition Output
Sensor fault 23 mA
Under-range dew point 4 mA
Over-range dew point 20 mA

Approved Galvanic Isolators

KFD2-CR-EX1.20200
KFD2-CR-EX1.30200
KFD0-CS-EX1.50P
KFD0-CS-EX2.50P
KFD2-STC4-X1.H
MTL5041, MTL5040

Highlights
  • ±1ºC (±1.8ºF) accuracy
  • Moisture in gases or liquids capability
  • 2-wire connection
  • Output configurable in ppmV and ppmW moisture content

Simple Operation
The Easidew PRO I.S. is easy to install and operate. It requires a 12 to 28 VDC supply and provides a linear 4-20 mA signal representing moisture content.

Moisture in Gases
The output can be configured by the customer, using simple software, to any range within -100 to +20ºC (-148 to +68ºF) dp, or 0-3,000 ppmV in gases. As the Easidew PRO I.S. responds to water vapor pressure in the gas sample, it will give the user an accurate determination of the actual dew-point at pressure up to 45 MPa (450 barg / 6500 psig). Flow rate is not critical to measurement accuracy (1 to 5 Nl/min (2.1 to 10.5 scfh)), though speed of response will be improved by operating at a higher sample flow.

Moisture in Liquids
In addition to its Moisture in Gases capabilities the Easidew PRO I.S. can be used to monitor moisture in non-polar liquids. It is factory programmed to provide an output in ppmW. This requires the saturation constants of the liquid to be programmed into the transmitter either at the factory or by the user, using the application software.

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