Medidor de ponto de orvalho online Medidor de ponto de orvalho por pressão - SKA/WSD-LDY

 Medidor de ponto de orvalho online Medidor de ponto de orvalho por pressão

 

Transmissor de ponto de orvalho

1:SKA/WSD-LDYThe dew point transmitter uses a polymer high-molecular sensitive capacitor, with fast response, stable and reliable performance, measuring range of-80°C~20°CTdAccuracy of ± across the full range2°CTdThis product features automatic zero-point calibration and automatic heating to clean chemical substances attached to the sensor surface, ensuring extremely stable long-term use. This polymer dew point capacitor is the result of over 20 years of arduous research. Generally, polymer capacitors are difficult to measure below-40°CTdFor dew points, due to the extremely low rate of change, the signal is difficult to distinguish in the circuit. We conducted extensive basic research and finally mastered the technology to improve low-humidity sensitivity. Currently from-70°CTdChange to-50°CTdUnder conditions, the basic capacitance changes from300pFChange to305pFExceeding all polymer dew point capacitors on the market.

Medidor de ponto de orvalho online Medidor de ponto de orvalho por pressão

2: Output signal:

Analog:4‑20mA Two-wire system (most common in industry, loop-powered)

Digital:RS485 Modbus‑RTUCan simultaneously output dew point and temperature; some models can outputPPMV Moisture concentration.

Common thread interfaces:G1/2、NPT1/4Screw directly onto the pipeline; the probe has a sintered filter to protect the sensor and block dust particles.

3. Typical application scenarios

Compressed air system: online monitoring at the rear end of refrigerated dryers and adsorption dryers to determine whether the dryer has failed and meet ISO8573 Compressed air quality standards.

Industrial gases: nitrogen, argon, hydrogen,SF6 Insulating gases, high-purity gases, glove boxes.

Plastics industry: monitoring of hopper drying gas to prevent bubble and silver streak defects in products.

Pharmaceutical, lithium battery, semiconductor: clean gases, freeze-drying equipment, inert protective gases.

Electric power:GISTransformer insulationSF6 Trace moisture monitoring in gases.

Medidor de ponto de orvalho online Medidor de ponto de orvalho por pressão

4. Key selection parameters

Dew point range

Refrigerated dryer: generally 0 ~ ‑20℃Td

Adsorption dryer:‑40 ~ ‑70℃Td

Ultra-dry high-purity gases:‑80 ~ ‑100℃Td

Try to keep the actual working dew point in the middle of the range, and avoid prolonged use at the range limits.

Accuracy: ordinary industrial ±2℃TdHigh precision ±1℃Td within. Low dew point (-60Accuracy will deteriorate below ℃).

Pressure resistance: confirm the pipeline working pressure; compressed air is generally 0.7‑1.0MPaFor high-pressure conditions, select the high-pressure type.

Medium operating conditions: whether the gas contains oil mist, dust, or solvent vapor; for conditions with heavy oil and gas, install a pre-filter for sampling.

Output method: two-wire 4‑20mA OrRS485Power supplyDC12‑24V。

Calibration cycle: ordinary 1‑2 Requires annual laboratory calibration; the sensor will drift slowly.

5. Installation and usage points

Install downstream of the dryer and at the front end of the gas usage point, avoiding elbows, dead corners, and water accumulation areas; install the probe vertically or facing downward.

The dew point transmitter measures pressure dew point; when atmospheric dew point is required, pressure conversion must be performed.

Liquid water must not directly hit the sensor, as it will cause damage; if there is a condensation risk, choose an anti-condensation sensor.

Gas flow rate should not be too high; for high-pressure and high-flow applications, a sampling pressure-reducing circuit is recommended.

Oil vapor will contaminate the aluminum oxide sensor, so oil removal filtration must be installed.