HUMIDITY CONTROLLER PWT-421
PWT-421 measures relative humidity, ambient temperature and determines the dew point. The measurement is made with a high-class humidity sensor built in the bottom part of the device or connected with it by a cable. The controller is available in three versions:
- equipped with two relays;
- equipped with 0 ÷ 20 mA or 4 ÷ 20 mA current loop;
- equipped with RS-232 output – current results may be stored in PC memory with use of delivered software
Characteristic features:
- Meter is equipped with a backlit LCD display.
- Waterproof housing IP-66.
- The meter is factory calibrated.
- User's calibration possible in 2 points: 33 % RH and 75 % RH.
- Powered with 12 V adapter.
- PWT-421 is equipped with a hanger for mounting on a wall.
- 24 months of warranty.
The sensor can't be used for measurements in a dusty atmosphere, chambers with chemicals, fat or oil, fumes or in presence of aggressive gases. On special order available meter which may collect up to 8000 data sets with chosen time interval. The available values of the interval are 1, 2, 5, 10, 15, 30 and 60 minutes.
If the memory capacity is used up the oldest result is deleted and replaced with a new one. The collected or actual results may be transferred to a PC with use of the USB connector. Delivered in the set software enables the transmission of data including measured result, measured temperature, time and date. Stored results can’t be viewed on the meter’s display, except the minimal and maximal values in given time.
TECHNICAL DATA
| Function | Humidity | Temperature |
|---|---|---|
| Range | 0 ÷ 100 % RH* | -40.0 ÷ 70.0 °C |
| RH resolution | 0.1 % RH | 0.1 °C |
| Accuracy (±1 digit) |
10 ÷ 90 % RH ±2 % ** beyond this range: ±4 % ** |
±0.8 °C** |
| Reaction time: t90 | < 10 s | < 8 s |
| Histeresis | < 1 % RH | - |
| Long-term offset | 0.5 % RH / year | - |
| Power supply | 12 V / 100 mA power adapter | |
| Memory*** | 8000 data sets collected with chosen time interval | |
| Isolation class | according to PN-83/T-06500 | |
| Radioelectric interference | N level | |
| Weight | 180 g | |
| Dimensions (mm) | L = 149, W = 82, H = 22 | |
| The relays’ parameters | 2A/250VAC/30VDC | |
| * | Condensation of water on the sensor requires drying, wet sensor has wrong indications. |
| ** | The accuracy with the temperature sensor. |
| *** | Model with memory available on special order. |