Moisture Analyzer DEW-TR-S500
1. Overview: The Trace PPM Moisture Transmitter controls moisture in a glovebox. Its range is 0-500ppm, linear over 0-50ppm; readings above 50ppm are estimates. A double-helix platinum wire is wound on a special insulator. The probe is coated with fully dehydrated P₂O₅ (phosphorus pentoxide). Water passes through the phosphate film, is electrolyzed into H+ and OH— and forms H2 and O2, producing a current dependent on gas moisture. The original signal is temperature-compensated and amplified. 2. Construction: The probe and special circuit use an NW40 flange seal. A protective cover prevents probe damage, and the signal connector is vacuum-sealed. The circuit sits in a sealed housing behind the flange and operates on 24VDC, outputting 4-20MA or 0-10VDC according to moisture content. A heating switch controls probe temperature. The manufacturer calibrates the circuit and probe with standard gas; no components normally require customer adjustment or maintenance. For special requirements, a calibration method may be provided so trained technicians can recalibrate accuracy below 100ppm. 3. Installation: The NW40 vacuum flange usually connects to an NW40 T-piece so the probe measures flowing gas rather than a dead zone. Low flow is needed during measurement. Do not connect the probe connector before thoroughly purging the box with inert gas. Operation is displayed through a PLC touchscreen or another secondary instrument. 4. Maintenance/regeneration: Routine care includes cleaning and regeneration. Removal and maintenance require soft, absorbent, lint-free cloth, a small amount of phosphoric-acid cleaning solution, gloves and goggles. Switch the analyzer off and remove it before probe maintenance.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Measurement Range | 0-500ppr |
| Power Supply | DC24V |
| Signal | 4-20 mA |
| Accuracy [In 100 ppm] | 2% of displayed value ± 1 ppm in 100 ppm by PLC or independent |
Datasheet
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