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Optidew High Performance Optical Dew-Point
Transmitter |
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The Optidew high performance optical dew-point transmitter works on the proven, fundamental optical dew-point measurement principle, giving unmatched and drift-free long-term performance. It offers a wide measurement range from the equivalent of <0.5 to 100% RH at ambient temperatures from -40 to +90°C.
Optidew provides two linear 4-20 mA outputs in addition to serial communications, allowing configuration and monitoring by a suitable computer or PLC system or via specific Optidew logging software. An adjustable volt-free contact alarm means that the Optidew can be used for direct process control. An optional high definition alphanumeric display provides local indication of the measured humidity.
Product Features
- Precision process dew point, % RH and temperature
measurement
- Measurement Range <0.5 to 100% RH from -40 to +90°C ambient
- 0.2°C dew-point accuracy (0.15°C optional)
- Fundamental drift-free dew-point measurement
- Rugged, IP66 (NEMA 6) industrial housing
- High temperature sensor option to 130°C
- Optional local display
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Technical Specification |
| Overall Accuracy |
±0.2°C dew point; ±0.1°C temperature
(±0.15°C dew-point accuracy optional) |
| Measurement Units |
°C, °F dew point; % RH; °C, °F temperature; gm-³ g/kg-¹; aw; ∆ (t-tdp)
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| Response Speed |
1°C sec-¹ + settling time (dew-point dependent) |
| Power Supply |
90 to 264 V, 47/440 Hz |
| DEW-POINT SENSOR
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| Operating Temperature Range |
-40 to +90°C
(with optional high-temperature sensor -20 to +130°C) |
| Mirror |
Gold plated copper
high temperature sensor-316 stainless
steel |
| Temperature Measurement |
4 wire 100 Ω 1/3 DIN class B Pt100 |
| Sample Flow Rate |
0.1 to 2 Nl/min (in sampling block) |
| Max Velocity |
10 msec-¹ (direct insertion)
30 msec-¹ (with sintered guard) |
| Pressure |
2 MPa (20 Barg)
25 MPa (250 Barg) optional |
| Ingress Protection |
IP66 (NEMA 4)
IP65 (NEMA 12) 25 MPa (250 Barg) sensor |
| Cable Length-Remote |
2m (250m max) |
| REMOTE PRT |
| Temperature measurement |
4-wire 100 Ω 1/10 DIN class B Pt100 |
| TRANSMITTER
ELECTRONICS |
| Resolution |
0.1 for °C, °F and % RH; 0.01 for gm-³ and g/kg-¹ |
| Outputs |
Analogue: Two channels 4-20 mA or 0-20 mA
Digital: RS-232 (RS-485 optional)
Alarm: Volt free contact, 2A @ 30 VDC |
| Status LEDs |
Power on, DCC and alarm status |
| Operating Temperature |
-20 to +40°C
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| Enclosure |
304 stainless steel (DIN 1.4301) |
| Ingress Protection |
IP66 (NEMA 6) |
| Cable Pack |
Mains and RS-232 cables |
OPTIONS: |
Local display
High accuracy dew-point sensor
High temperature sensor
Customised sampling systems |
Applications |
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