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Produktinformation
The P18/P18L is ideal for monitoring temperature and humidity in production environments. Choose either 2 x 4-20mA output or RS485 Modbus RTU output.
Key points:
- Wide range suits most industries
- Analogue or serial outputs
- Choice of filters for the sensor
- Rugged, reliable, smart.
The LEL18 transducer is for the continuous measurement and conversion of relative humidity and ambient temperature into a digital or analogue voltage or current standard signal. The transducer may be programmed and calibrated through the RS-485 interface.
Sensor shields allow the transducer to operate in various ambient conditions, dusty, dry, corrosive, etc. The transducer is designed to be mounted on a wall.
Applikationer
- calculation of selected physical quantities, (dew-point temperature, absolute humidity)
- conversion of measured quantities into a linear output signal
- memory of maximum and minimum values for each value
- programming of the measurement averaging time
- servicing of RS-485 interface in MODBUS RTU mode.
Blockdiagram
Mått
P18 specifications
| Relative humidity range | 0 to 100% |
| Basic error - humidity | ± 2% for RH = 10...90% ± 3% remaining range |
| Hysteresis for humidity | ± 1% |
| Temperature range | - 30 to 85°C |
| Temperature accuracy | ± 0.5% of range |
| Temperature influence | ± 25% /10°C |
| Intended installation | |
| The P18 or P18L transducer is fixed to a wall by way of 2 screw holes, outside the main sealed enclosure. Must be mounted in a typical area to be monitored, in order to give realistic representation of conditions in that area. | |
| RS-485 digital output (P18 only) | |
| Transmission protocol | MODBUS |
| Baud rate | 4800, 9600, 19200, 38400, 57600 bit/s |
| Format RTU | 8N2, 8E1, 8O1, 8N1 |
| Response time | 300 ms |
| Analogue output | |
| Current | 4 to 20 mA or 0-10V |
| Current output load | 200 Ohms max |
| P18L has a simple single 2 wire connection, where the unit modulates the current in the power supply cable. A selector switch chooses whether the output is proportional to temperature or humidity | |
| P18 has an active output, giving simultaneous temperature and humidity + modbus data. | |
| Rated operating conditions | |
| Supply | 9 to 36 V d.c. |
| Consumption | < 2 VA |
| Ambient temperature | - 30 to 85 deg. C |
| Relative air humidity | < 95% non condensing |
| Preheating time | 15 minutes |
| Protection | IP 65 |
| Weight | 125 g |
| Electromagnetic compatibility | |
| - immunity acc. to EN 61000 -6-2 | |
| - emission acc. to EN 61000 -6-4 | |
| Installation requirements acc. to EN 61010-1 | |
| - installation category III | |
| - pollution grade 2 | |
| - working voltage in relation to earth 50 V | |
| Fixing positions | |
| Dry areas | Any |
| Exposed to water | With the sensor pointing down |
