Cảm biến độ ẩm điểm sương Alpha Moisture Dewpoint SENSOR-PL | Purple Dewpoint Sensor
(Sira 02ATEX2130X -100...0oC-Dewpoint -20...50oC M14 x 1.25pitch Calibration certificate)
Purple Dewpoint Sensor SENSOR-PL
(Replacement for Sensor serial number 230631
Sensor: Ultra High Capacitance Aluminium Oxide
Measuring Range: -100°C to 0°C dewpoint
Operating Temperature Range: -20°C to 50°C
Accuracy: ±2°C Dewpoint
Process connection: M14 x 1.25 pitch
Included: Calibration Certificate
(traceable to National/International Humidity Standards)
Ultra High Capacitance Aluminium Oxide Sensor
The Alpha Moisture Systems Dewpoint Sensor is an ultra high capacitance aluminium oxide sensor. The sensor consists of an ultra high purity aluminium wire, the surface of which is chemically oxidised to produce a porous insulating layer of partially hydrated aluminium oxide. A permeable conductive gold film is deposited on the oxide layer and that gold film and the aluminium wire form the two plates of a capacitor. (see diagram below).
The oxide layer, which forms the dielectric layer of a capacitor, is in the form of a mass of tubular pores running up from the aluminium core to the surface.
A dynamic equilibrium is established between the water vapour outside the sensor and the absorbed water within it, the water absorbed into the pores is directly related to the moisture content of the gas surrounding the sensor.
The pore size of the aluminium oxide layer is specific to water vapour and smaller molecules but, due to the dielectric constant of water compared to that of other gases that may enter the pores, such as hydrogen, the sensor response is specific to changes in water vapour concentration regardless of the carrier gas, and is resistant to many contaminants because they cannot enter the pore structure.
The overall dewpoint range covered by the sensor is -110°C to +20°C (-184°F to +68°F) dewpoint, which corresponds to 0.001 ppm to 0.2 per cent by volume.
Advantages of the Alpha Sensor
- Wide dynamic range from 0.001 ppm to 0.2 per cent by volume
- Stability, low hysteresis and temperature coefficients
- Flow independent
- Can be intrinsically safe (when used in conjunction with a Zener Barrier)
- High selectivity for moisture
- Can operate over a wide range of temperature and pressure
- Require little or no maintenance
INTRINSIC SAFETY CERTIFICATION:
Sira 02ATEX2130X. IECEx BAS 16.0082X. CSAE 21UKEX3447X.
ATEX, UKCA and IECEx Markings
II 1G, Ex ia IIC T6 Ga (Ta = -20°C to +50°C)
Ex. ia IIC T6 Ga (-20°C ≤ Ta ≤ +60°C)
Standard Dewpoint Ranges
: Various between –110°C to +20°C (1.6ppb(v) to 23,000ppm(v)
Better than ± 2°C over full range
-20°C to + 50°C
-50°C to +70°C
0-90% RH non-condensing
M14 x 1.25mm pitch
Male coaxial plug
CE and UKCA Compliant.
How to Order
The Sensor is ATEX, IECEx and UKCA Certified and can be used in either hazardous or non-hazardous areas. Where the sensor is to operate in an area where a flammability hazard my exist, the Sensor is located in the Hazardous Zone and the Zener Barrier and Hygrometer Display unit are installed in the Safe Area (see illustration below). Distance from Sensor to Zener Barrier or Hygrometer Display can be up to 1000m.
Corrosive Gases: The Sensor should not be exposed to corrosive gases (or corrosive contaminants in the gas sample) as these can chemically attack the sensor, impairing calibration accuracy and/or damaging it beyond economic repair. Examples of such gases are mercury (Hg), ammonia (NH3), chlorine (Cl2) etc. Strong oxidising agents such as ozone (O3) should also be prevented from coming into contact with the sensor.
- Xem chi tiết Tài liệu kỹ thuật/ Datasheet Alpha Moisture Dewpoint SENSOR-PL Sira 02ATEX2130X ở đây