Product guide

25
Humidity and Dew-Point Instruments
Please note: Michell Instruments adopts a continuous development program which sometimes
necessitates specifi cation changes without notice. Please contact us for latest version.
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Precision Manufacturing
Issue No: Easidew TX IS_97168_V3_UK_0312
Easidew TX I.S.
ATEX, FM/CSA Certifi ed Dew-Point Transmitter
An ATEX, FM/CSA certifi ed, 2-wire, rugged impedance dew-
point transmitter for continuous measurement in hazardous
area applications.
Highlights
• ATEX FM/CSA certifi ed
• 2-wire loop powered connection
• Dew point or ppm moisture content
• IP66 (NEMA 4)
• Excellent sensor protection
• Wide measurement range, calibrated -100 to +20ºC
(-148 to +68ºF) dew point
• Operating temperature: -40 to +60ºC (-40 to +140ºF)
• Fast response
Technical Specifi cations
Performance
Measurement range (dp) -100 to +20°C (-148 to +68°F) dew point
Accuracy (dp) ±2°C (±3.6°F) dew point
Response time 5 mins to T95 (dry to wet)
Repeatability 0.5°C (0.9°F) dew point
Electrical output/input
Output signal 4-20 mA (2-wire connection, current source)
User confi gurable over range
Output Dew point, moisture content for ppm
V
Output range Dew point: -100 to +20°C (-148 to +68°F)
Moisture content in gas: 0-3000 ppm
V
Supply voltage 12–28 V DC
Load resistance Max 250  @ 12 V (500  @ 24 V)
Current consumption 20 mA max
Operating conditions
Operating humidity 0–100% RH
Operating temperature -40 to +60°C (-40 to +140°F)
Operating pressure 45 MPa (450 barg / 6500 psig) max
Flow rate 1 to 5 Nl/min (2.1 to 10.6 scfh) mounted in
standard sampling block; 0 to 10 m/sec
(0 to 32.8 fps) direct insertion
Temperature coeffi cient Temperature compensated across
operating temperature range
Mechanical specifi cation
Hazardous Area Certifi cates ATEX - II 1 G Ex ia IIC T4 (-20°C  Ta 
+70°C)
FM - IS / I / 1 / ABCD / T4 Ta = +70°C
CSA - IS Class 1 Div 1 Groups ABCD T4
IECEx - Ex ia IIC T4 (-20°C  Ta  +70°C)
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
Dimensions L=132mm x ø27mm (L=5.19” x ø1.06”)
Filter HDPE Guard <10m
80m sintered guard (optional)
Mounting Thread 5/8” - 18 UNF
Weight 150g (5.29oz)
Interchangeability Fully interchangeable transmitter
Diagnostic conditions
(factory programmed)
Condition
Sensor fault
Under-range dew point
Over-range dew point
Output
23 mA
4 mA
20 mA
Approved galvanic isolators KFD2-CR-EX1.20200
KFD2-CR-EX1.30200
KFD0-CS-EX1.50P
KFD0-CS-EX2.50P
KFD2-STC4-EX1.H
MTL5041, MTL5040
Dimensions