GE PM880 (704820 complete set) is a field portable intrinsically safe hygrometer built on mature thin-film alumina sensing principle, matched with MS29, MS32 and MMS35 series insertion moisture probes to realize rapid trace moisture testing in working sites such as natural gas stations, chemical devices and gas cylinder filling stations. The code 704820 stands for the factory standard full configuration package of the PM880 host, including host body, rechargeable battery, charging adapter, probe connecting wire, portable sampling assembly, storage handbag and operation manual, supporting one-stop field deployment without extra accessory matching.

The instrument supports a wide dew point measuring range of -110°C ~ +60°C, displays data in multiple units including dew point temperature, ppmv, ppmw and lb/MMSCF for natural gas metering. It integrates temperature real-time compensation logic, and when paired with pressure integrated probes, it automatically completes pressure correction to improve the accuracy of ppm moisture calculation under variable pipeline pressure conditionsManualsLib. The backlit graphic LCD interface is equipped with physical keys for simple parameter setting, real-time numerical display and curve viewing, and the internal memory can store up to 60 groups of site logging files for later data review and export.

The whole machine complies with intrinsic safety explosion-proof standards for hazardous gas areas, with IP67 protection grade for the shell, adapting to humid pipe galleries, outdoor compressor stations and flammable medium testing environments. The separated design of host electronic part and detection probe allows quick replacement of faulty probes on site without modifying host programs, greatly shortening equipment downtime during maintenance. The built-in large-capacity rechargeable battery can sustain more than 12 hours of continuous measurement, meeting the demand for all-day field patrol inspection work.

Data transmission adopts IrDA infrared communication mode, cooperating with supporting adapter and PanaView upper computer software to upload test records to PC for report sorting and archiving. The supporting portable sampling system can stably extract pipeline medium at a constant flow rate, avoid impact of airflow turbulence and condensed liquid on the sensor, and protect the alumina sensitive chip from contamination and damageManualsLib. It is compatible with all GE standard M-series, TF-series and MIS-series moisture probes, with strong universal matching performance for different detection working conditions.

Each complete set of 704820 is subjected to overall function inspection and calibration verification before delivery with NIST traceable standard gas sources to ensure the overall consistency of measurement performance of the whole machine set. Daily maintenance only requires regular cleaning of the probe filter element and periodic probe calibration according to the on-site medium pollution degree; the host has no wearing parts, and the comprehensive use cost of long-term field testing is low. Widely used in natural gas transmission pipelines, SF6 electrical equipment detection, air separation dry gas monitoring, petrochemical tail gas and solvent liquid dissolved water testing scenarios.