Product overview
The GDP online dew-point instrument is capable of preventing dust, dirt and water splashing based on the structure design and can be used in harsh environments. It's of excellent long-term anti-condensation stability and durability, thus minimal maintenance is required.
It's an ideal choice for industrial application and mainly used for air and plastic desiccant, drying room, drying gas and high-voltage breaker.
In bad conditions (such as comprehensive influence of low humidity and high air temperature), the measurement result is also accurate and reliable.
It's mainly used for petrochemical engineering,
natural gas, industrial gas, semiconductor industry, drying industry, food industry, power sector, machine manufacturing, air separation industry, pharmaceutical industry, lithium battery new energy industry, etc.
Product features
● Many output parameters: Display various humidity parameters, such as dew point/frost point temperature, relative humidity, ppmv(volume of moisture/dry gas volume) and environment temperature;
● The measurement data is displayed numerically or graphically on the LCD display screen and the output readings can be converted into real-time graphics by a key;
● The user interface is easily used, and the fixed keys refer to the graph, hold/save and record keys;
● The structure is light and firm with waterproof and dustproof enclosure protection. It can be used stably in an extremely hostile environment and is suitable for various occasions.
Technical indicators
● Measuring performance
Dew point | |
Sensor: | GDP-M350 |
Measuring range: | -25··+100℃(-13···+212°℉) |
Accuracy: | ±2℃(±3.6°℉)Td/f |
Response time: 63％ [90％] | |
From wet to dry: | 5s-15s |
From wet to dry: |
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Accuracy: | Reading+-12% |
Probe operating temperature scope |
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Operating temperature scope of the body for connection on the probe |
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Storage temperature | -40···+80℃(-40···+176°℉) |
Measuring environment: Air, nitrogen, hydrogen, argon, helium and oxygen | |
IP protection level | IP66 |
● Input and output | |
Operating voltage | 15··30 VDC |
Current consumption |
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Digital output | RS-485, non-isolated |
Protocol | Modbus RTU |
Output parameters | |
Dew point temperature, mixing ratio, water concentration, vapour pressure and water mass fraction | |
● Machinery specification | |
Connector joint | M125 pointer A standard |
Probe cable length |
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Probe |
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Probe body | Stainless steel AISI316L |
Cable enclosure | Plastic FEP |
Cooling device | Stainless steel and aluminum |
● Measurement parameter | |
Sensor | GDP-M80 multiparameter sensor |
| ±2℃(±3.6°℉) |
Pressure accuracy at 23℃ (73.4°F) | ±0.4%FS |
Pressure and temperature dependence bar/10℃(18°F) | ±0.01 |
ppm Accuracy (7 bar) | ± (12％ of 14ppm＋reading) |
Dew point | 70··+30℃(-94···+86°℉) |
Pressure, absolute | 1···12 bar(14.5···174 psi) |
Temperature (available only when the output RS-485 is chosen) | -40···+80℃(-40···+176℉) |
ppm moisture value (based on the volume) | 1···40 000 ppm |
Dew point, having been converted into atmospheric pressure | -75··+30℃(-103···+86°℉) |
● Measuring performance | ● Input and output | |||
Operating temperature of electron device | 40··+60℃(-40···+140°℉) | Accuracy of analog output | ±0.01V/±0.01 mA | |
Operating pressure | 1···12 bar(14.5··174 psi) | Digital output RS-485, non-isolated, Modbus RTU protocol | ||
Mechanical temperature resistance | 0··50 bar(0··725 psi) | Connector | 4-pin M 8 | |
Relative humidity | 0··100% | Operating voltage | ||
Measured gas | Air/non-corrosive gas | Current output | 21···28 VDC | |
Sampling gas velocity | No effect on measurement precision | Voltage output and/or use at low temperature (-40··-20℃ (-40···-4°℉)) | 20···28 VDC | |
Storage temperature | Only RS-485 | 15···28 VDC | ||
Only transmitter | -40···+80℃(-40···+176°F) | Analog output (two channels) | ||
Temperature accuracy | Current output | 0··20mA、4··20mA | ||
0…40℃(+32···+104°℉) | ±0.5℃(±0.9°℉) | Voltage output | 0··5V,0··10V | |
0-40···80℃(-40···+176°℉) | ±1℃(±1.8°℉) | Input current | ||
Sensor response time | Carrying current in the conventional measurement process | 20mA＋negative | ||
Pressure response time | ≤1s | Carrying current in the self diagnosis process | 300mA＋ negative | |
Shipping and packaging | -20···+80℃(-4···+176°℉) | External load | ||
Dew point response time: 63％ [90％] under the condition of 20℃ and 1bar | Current output | Maximum: 500Ω | ||
-50 | 5s [10s] | Voltage output | Minimum: 10kΩ | |
-10→-50℃ Tdf | 10s [2.5min] | |||
Working environment | |
Temperature | -40···+70℃(-40··+158°F) |
Relative humidity | 0···100％RH (maximum: +20℃/+68°℉) |
Pressure | 0··50 bar(725 psia) |
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Flow rate of sampled gas | No effect on measurement accuracy |
Passing EMC certification | EN61326-1, industrial environment |
● Measurement parameter | Uncalibrated range | -100···+20℃(-148···+68°℉)Td | |
Sensor | GDP-M70 | Typical response time: 63％ [90％] when the gas temperature is 20℃ (＋68°℉) and the air pressure is 1bar | |
Recommended calibration interval | 2 years | -20··-80℃Td | 0.5 min[7.5 min] |
Dew point temperature 1) | -80··-20℃Td | 2s[5s] | |
Measuring range: | -80·-20℃(-112··-4°F)Td | Typical long-term stability | Higher than 2℃ (3.6°F)/year |
Accuracy | Volume concentration(Kg/m3) | ||
-80··-40℃(-112··-40°℉): ±2℃(3.6°℉)Td | Measuring range (typical) | 0··500 ppm | |
-40·-20℃(-40-·-4°F): ±3℃(5.4°F)Td | Accuracy under ＋20 ℃ (＋68 °F) 1013 mbar: ± (20％ of 0.2ppm＋reading) | ||
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Digital output | RS-485 (two-wire) |
| Selectable by the user |
| 5V, 10V, 20mA or LED |
| 11+-0.01V/+-0.01mA |
Operating voltage | |
| 11···28 VDC 1) |
Voltage output | 15···28 VDC 1) |
Current output | 21··28VDC |
Supply voltage | |
Conventional measurement | Load current20mA＋load current |
Self-diagnosis period | Maximum 220mA pulse |
Mains ripple | Maximum: 0.3V |
External load | |
Voltage output | Minimum: 10kΩ |
Current output | Maximum: 500Ω |
● Machinery specification | Mechanical connection: ISO G1/2", NPT 1/2",UNF 3/4"-16",UNF5/8"-18" | ||
Enclosure material (wet parts) | ISI316L | IP protection level | IP66 |
Stainless steel mesh filter | Filter body AISI303, screen AISI316L, grade: 18μm | Storage temperature scope | 0-40··+80℃(-40···+176°℉) |
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