Item # Optidew, Optidew Chilled Mirror Hygrometers on Michell Instruments, Inc.
Michell Instruments, Inc. - Item # Optidew, Optidew Chilled Mirror Hygrometers
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Item # Optidew
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Optidew Chilled Mirror Hygrometers
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The Optidew high performance optical dew point transmitter is based on the proven, fundamental optical dew point measurement principle, giving long-term unmatched drift-free performance. It offers a wide measurement range from the equivalent of <0.5 to 100%RH at ambient temperatures from -40 to +90ºC (-40 to +194ºF). Optidew provides two linear 0/4-20 mA outputs and RS232 serial communications, allowing configuration and monitoring by a suitable computer or PLC system or via specific Optidew logging software. An adjustable isolated alarm contact allows Optidew to be used for direct process control. An optional high definition alphanumeric display provides local indication of the measured moisture and temperature values.
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Performance
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Dew-Point Sensor
·
Remote PRT
·
Transmitter Electronics
Performance
1-Stage Measurement Range
-30 to +90ºCdp (-22 to +194ºFdp)
2-Stage Measurement Range
-40 to +90ºCdp (-40 to +194ºFdp)
High Temperature Measurement Range
-20 to +130ºCdp (-4 to +266ºFdp)
Measurement Accuracy
±0.2ºCdp (±0.36ºF)
±0.1ºC temperature (±0.18ºF)
±0.15ºCdp accuracy optional (±0.27ºFdp)
Measurement Units
ºC, ºF dew point; % RH; ºC, ºF temperature;
g/m
3
; g/kg; aw; Δ (t - t dew point)
Response Speed
1ºC/sec plus settling time (dew point dependant) (1.8ºF/sec)
Power Supply
85 to 264 VAC, 47/440 Hz
Dew-Point Sensor
Mirror Options Available
Gold Plated Copper
High Temp Sensor - 316 Stainless Steel
Solid Gold
Temperature Measurement
4 wire Pt100, 1/3 DIN class B
Sample Flow Rate
0.1 to 2 l/min in sampling block (0.2 to 4.23 scfh)
Maximum Velocity
10 m/sec direct insertion (1968 ft/min)
30 m/sec with sintered guard (5905 ft/min)
Pressure
2 MPa (20 barg/290 psig)
25 MPa (250 barg/3626 psig) optional
Ingress Protection
IP66 (NEMA 4)
IP65 25 MPa (250 barg/3636 psig) sensor (NEMA 12)
Maximum Remote Cable Length
2 to 250 m
6.5 to 820 ft
Remote PRT
Temperature Measurement
4 wire Pt100, 1/10 DIN class B
Transmitter Electronics
Resolution
0.1 for ºC, ºF and %RH
0.01 for g/m
3
and g/kg
Analog Outputs
Two channels 0/4-20 mA
Digital Outputs
RS232
RS485 (Optional)
Alarm Outputs
Volt free contact, 2 A @ 30 VDC
Status LEDs
Power on, DCC and alarm status
Ambient Operating Temperature
-20 to +40 ºC
-4 to +104 ºF
Enclosure
304 stainless steel
Ingress Protection
IP66 (NEMA 4X)
Cable Pack
Power and RS232 cables
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Dew-Point, Humidity, Oxygen
