The "Moisture measurement ex-area“Places particularly high demands on technology, security and certification. In explosive atmospheres ATEX moisturizer sensors and Hygrotransmitter Not only measure exactly, but also exclude any sources of ignition. This guide shows you how to do the right one ATEX-compliant moisture-like technology Select and use it safely.
Why is the moisture measurement in ex-areas so sensitive?
In many industries, explosive atmospheres are created by the interaction of flammable gases, Dampen, Fog or Dust With air. Moisture measurement is essential in such environments for:
- Process monitoring (e.g. drying processes, humidification)
- Product safety (e.g. hygroscopic substances)
- Explosion protection (avoidance of electrostatic discharges if air is too dry)
Typical areas of application:
- Painting and coating systems
- Chemistry, pharmaceutical, food industry
- Dangerous goods warehouse, silos, gas monitoring stations
- ATEX-certified HLK/ventilation systems
ATEX zone division & device categories
So a ATEX moisture sensor can be selected correctly, the Zone division Crucial at the site:
Gas-ex zones:
- Zone 0: Constantly or for a long time explosive atmosphere
- Zone 1: Occasional explosive atmosphere
- Zone 2: Rare, short -term danger
Staub-ex zones:
- Zone 20: Constant dust explosion risk
- Zone 21: Occasionally available
- Zone 22: Briefly and rare
Device categories:
- Category 1: Zone 0/20
- Category 2: Zone 1/21
- Category 3: Zone 2/22
Requirements for ATEX moisture sensors
Court protection species:
- Ex I (self -security) - electrical energy so limited that no ignition is possible
- EX D (pressure -resistant capsule) - Explosion pressure is kept in the housing
- Ex e (increased security) - Constructive protection against sparks & overheating
Temperature classes:
- Sensors must Below the zünt temperature The ambient substances remain
- Classes T1 (450 ° C) to T6 (85 ° C)
IP protection species:
- IP65: Dustproof & splash -proof
- IP66/IP67: For high -pressure cleaning or temporary undercut
Selection criteria for hygrotransmitter in the ex-area
-
Suitable ATEX zone & device category determine
-
Measurement principle: Capacitive sensors are standard:
Fast reaction, high accuracy (typical ± 2 % RF)
Low of maintenance & durable -
Temperature and moisture area observe:
Typical: -40 ° C to +80 ° C / 0–100 % RF -
Electrical security:
Galvanic separation
Special separation barriers & self -safe power supplies required
Product recommendation: Humiguard® HT130 & HT131 by Seikom Electronic
For applications in zone 0, 1 and 2, Seikom Electronic offers two ATEX-certified solutions:
Humiguard® HT130 -moisture sensor for ex-zones (single-channel)
- ATEX approval: II 1/2 g Ex Iic T4 GA/GB
- Measuring area: 0–100 % RF, ± 2 % accuracy
- Housing: Stainless steel, IP66
- Tension: 24 V DC self -safe
- Temperature range: -40 to +80 ° C
Humiguard® HT131 - Moisture & temperature transmitter (two-channel)
- Additional integrated PT100 temperature sensor
- Two -channel version for separate signal edition
- Same ATEX classification as HT130
Both sensors meet the highest demands Moisture measurement ex-area And are ideal for rough industrial environments.
Maintenance & calibration
- Annual calibration recommended
- Visual examination (housing, cables, seals)
- Calibration with backlit references (e.g. salt solutions)
