品牌
其他厂商性质
所在地
TMA 204
Principle of Operation The P2O5-sensor uses the principle of dissociation of water to hydrogen and oxygen. The sensor element itself consists of a round glass body on which two electrodes are wound at constant distance. Depending on the sensor type these electrodes are either made out of platinum- or rhodium wire. Between these electrodes a thin film of phosphoric acid (H3PO4) is applied. The sensor-current causes the water contained in the acid to dissociate to hydrogen and oxygen. The result of this process is P205 (diphosphorous pentoxyde). P205 is a highly hygroscopic substance which absorbs the water from the sample gas. Through continuous dissociation of the water a balance between the water content of the sample gas and the water which is being dissociated builds up. The electrolysis current is proportional to the water content in the sample gas. It is displayed on the instrument readout after it is processed by the instruments signal amplifier. This principle of measurement can be used on all gases (Cl2, HCl, H2S, H2SO4, HBr, SO2, SF6, CO2, PH3, all inert gases and hydrocarbons) except those which chemically react with phosphoric acid or polimerise. Analyzer
| The Analyzer The new trace moisture-analyzer TMA is fully microprocessor-controlled and is designed to operate in rough field service. The amplifier is a high technology, solid state unit which is available as a desk-, as a portable version and as a 19"-rack. 2 alarm-levels can be set, 5 potentialfree contacts for range identification, one analog output and one serial port RS 232 are integrated. For remote control there are 5 isolated input contacts to switch the ranges externally. The system can be set in 4 modes: manual, RS 232, external, auto-range. The high quality LC-display shows the measuring result in ppm/v, the alarm-levels which are set and also the mode (for example: auto ranging). The cable-clamps of the sensor are of special high quality water proof connectors. After switching on the unit, the instrument automatically does a self-check (zero-/span-control) To measure in explosive hazardous areas the unit will be fitted with safety barrieres (intrinsically-safe, zone 1). A portable unit with rechargeable battery and built in charger is also available.
19"- racks, 3 U and wall mounting enclosures are also available (enclosures with protection-class IP 54/64 on request) Order examples
|
