The ATT520X as part of the AQUATRACE® series offers the usual good performance as well as minimal and, above all, cost-effective maintenance and a very long service life of the sensor.
Coulometric moisture sensor - AQUATRACE®
It is an absolute measurement method because phosphorus pentoxide (P2O5) reacts 100% selectively to water. There are no cross-sensitivities. In addition to the very fast response time from dry to moist, the main advantages of the AQUATRACE® trace moisture sensors are their robustness and their ability to easily tolerate corrosive components in gases (Cl2, HCl, F2, HF). In addition, they do not tend to drift the measured value at high humidity events. The sensors can be easily regenerated by the customer. The lower detection limit of the AQUATRACE® sensors is 0.001 ppmV ( parts per million ) or 1 ppbV ( parts per billion ).
Phosphorus pentoxide (P2O5) has a high affinity to absorb water in order to convert it into tetrametaphosphoric acid. It is an extremely hygroscopic salt. This property makes it ideal for building a moisture-sensitive sensor. The process goes back to the KEIDEL measuring cell developed in 1956. In contrast to the KEIDEL measuring cell, the sensitive layer of our AQUATRACE® sensor is applied on the outside. A decomposition voltage greater than 2V is present at two Pt-electrodes, which electrolyzes the metaphosphoric acid. This releases hydrogen and oxygen and the phosphorus pentoxide is again available for the absorption of water molecules. The P2O5 thus acts as a catalyst for the electrolysis of water molecules. The thus resulting hydrogen and oxygen are removed from the system by the gas flow. The measured decomposition current IM is a direct measure of the moisture according to Faraday's law. The volume flow must be kept constant for a precise measurement.
The method is not suitable for moisture determination in NH3 (ammonia).
Features and advantages
- Automatically calibrated through sensor regeneration, without calibration gas
- Superior performance is proved in the course AQUATRACE® series analyzer working.
- Color screen display
- Magnetic button for Adjustments
- Shows ppm-value and dewpoint temperature
- Robust housing for industry applications in field
- Self-test performance and diagnostic functions, as well as alarm function
- Status LED (Complies with NAMUR NE107)
- 3 Relays (2A, 230V AC/DC freely set alarm), System alarm
Applications
- Lithium battery industry
- Glove boxes
- Vacuum oven manufacturer industry
- Universities and research institutions (Nuclear / new energy materials)
- Heat treatment of metals / welding industry
- Refrigerator / compressor
- OLED / capacitor / HID lamps and electronic industry
- Chlor-Alkali Chemical and PVC Chemical industry
- Fluorine Chemical industry
- Poly / Silicones industry
- Gas and Petrochemical industry
- Power industry
- Pharmaceuticals industry
Measurement variants
- By-Pass: Sensor in standard measuring chamber with remote transmitter unit
- Inline: Sensor with KF flange connection or G1/2 screw-in thread and combined transmitter unit
Specifications
|
Measuring principle |
Coulometric (P2O5 sensor) |
|
Sensor Material |
Platinum coated ceramic rod (Al2O3) |
|
Display |
1.8" industrial color LCD, 160*128Pixel |
|
Language |
English Menu |
|
LED Light |
Status LED (Complies with NAMUR NE107) |
|
Operation |
Magnetic button |
|
Resolution |
0.001-500ppmv (Maximum 2500 ppmv, free setting) |
|
Accuracy |
+/- 2% of measuring value or +/- 0.2ppmv (0~500ppmv range) 10% of measuring value (0~1ppmv range) |
|
Sensitivity |
1ppb |
|
Lowest detection limit |
1ppb |
|
Response Time |
Less than 1s |
|
Action time T90 (up) |
Less than 5s |
|
Action time T90 (down) |
Less than 15min |
|
Diagnosis function |
Self-diagnosis, heart beat monitoring |
|
Analog Output |
4~20mA |
|
Relay Output |
3 Relays (2A, 230V AC/DC freely set alarm), System alarm |
|
Communication |
RS485 MODBUS RTU Slave |
|
Power |
19 ~ 28V DC,0.5A |
|
Ambient Temperature |
5 ~ 65°C |
|
Process Pressure(Max.) |
10 bara (special solution up to 30 bara) |
|
Gas Flow |
20Nl/h(Recommend) |
|
Process connection |
G1/2” screw or KF25/40 flange or standard measuring chamber |
|
Electrical protection |
EMI / RFI CEI-EN55011 – 05/99 |
|
Housing Material |
Aluminum alloy, Stainless steel |
|
Size |
Φ110*240*107 mm |
|
Weight |
1.5Kg |
|
Explosion-proof |
Ex d IICT4 optional |
|
Tech Draw (mm) |
|
3D-Step-File:
ATT520X-step (click to download)