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LUMEL

LUMEL

P18(D/L) Temperature and Humidity Transducers

With analogue output (P18/D/L) and digital output (P18/D)

  • Converts temperature and humidty values to analogue or digital outputs
  • 0-10v or 4-20mA output (P18)
  • 4-20mA Loop powered (P18L)
  • LCD Display (P18D)

Product description

The P18/P18D transducer is a device destined for the continuous measurement and conversion of relative humidity and ambient temperature into a digital way and into a voltage or current standard signal. The transducer programming is possible through the RS-485 interface.
Applied sensor shields (table 1) enable the application of the P18 transducer to operate in various ambient conditions. The transducer is designed to be mounted on a wall.

P18/P18D (with local display)

Basic parameters:

range of relative humidity measurement (RH)

0...100% without condensation1)

basic error of humidity conversion

± 2% of the range for RH = 10...90%
± 3% for the remaining range

hysteresis for humidity measurement

± 1%

range of temperature measurement (T)

- 20...60ºC2)

basic error of temperature conversion

± 0.5% of the range

calculated quantities

absolute humidity (a) [g/m3]
dew-point temperature (Td) [ºC]

additional errors:
temperature influence

± 25% of the basic error/10ºC

RS-485 digital output:

transmission protocol

MODBUS

baud rate

4800, 9600, 19200, 38400, 57600 bit/s

mode RTU:

8N2, 8E1, 8O1, 8N1

maximal response time

300 ms

Analog output (optional):

current

4...20 mA

voltage

0...10 V

maximal load capacity of the current output

100 Ω

minimal load capacity of the voltage output

1k Ω

Rated operating conditions:

supply

9...24 V a.c./d.c.

consumption

< 0.5 VA

ambient temperature

- 30...23...85ºC

relative air humidity

< 95% 3)

rate of air flow

≥ 0.5 m/s4)

preheating time

15 minutes

protection degree ensured by the housing

IP 65

weight

125g

fixing

on a wall

working position:

- in applications non-exposed to a direct contact with water: any
- in applications exposed to a direct contact with water: with the
sensor chamber directed towards the ground.

Electromagnetic compatibility:

noise immunity

acc. to EN 61000 -6-2

noise emission

acc. to EN 61000 -6-4

Security requirements acc. to EN 61010-1

installation category

III

pollution level

2

phase-to-earth working voltage

50 V

 

P18L Technical data

The P18L transducer is a device destined for the continuous conversion of relative humidity or ambient temperature into a standard analog current signal.
Applied sensor shields (table 1) enable the application of the P18 transducer to operate in various ambient conditions. The transducer is designed to be mounted on a wall.

P18L

Basic parameters:

range of relative humidity measurement

(RH) 0...100% without condensation1)

basic error of humidity conversion1)

± 2% for RH = 10...90% ± 3% for the remaining range

hysteresis for humidity measurement

± 1% RH

range of temperature measurement (T)

- 20...60ºC

basic error of temperature conversion

± 0.5% of the range

additional errors: - temperature influence

± 25% of the basic error/10ºC

Analog output

current

4...20 mA

maximal load capacity of the current output

500 Ω

Rated operating conditions:

supply¹

19...30 V d.c.

consumption

< 1.5 VA

ambient temperature

- 30...23...85oC

relative air humidity

< 95%
(admissible condensation of water vapour)

rate of air flow

2 m/s

preheating time

15 minutes

protection degree ensured by the housing

IP 65

weight

125 g

dimensions

(35 x 58 x 118) mm

fixing

on a wall

working position

- in applications non-exposed to a direct contact with water: any
- in applications exposed to a direct contact with water: with the sensor
chamber directed towards the ground.

Electromagnetic compatibility:

immunity

acc. to EN 61000 -6-2

emission

acc. to EN 61000 -6-4

Security requirements acc. to EN 61010-1

installation category

III

pollution grade

2

working voltage in relation to earth

50 V

 

Dimensions


1) In case of water vapour condensation on the sensor surface, the error measurement does not exceed the basic error till the moment of drying up the sensor structure.

2) The absolute temperature measurement range is -30...85°C, but beyond the basic range, the measurement class is not guaranted.

3) Admissible condensation of water vapour when using additional sensor shields, (see table 1).

4) For the air flow < 0.5 m/s, the temperature and humidity measurement error can grow of 100°C.

Connection diagrams

P18

Transducer without analog outputs

Transducer with current outputs

Transducer with voltage outputs


P18L

 

Sensor protection shields

Design

Shield code

Name

Construction

Features

Typical application

0874-490-016

Membrane
filter

Casing made of PC
membrane of PTFE
laminated by a film.
Pore size:1 μm

Mean filtration effect.
Maximal temp.: up to 80ºC
Response time t10/90: 15 s

Building automation.
For application in
rooms with low
pollution.

0874-490-015

Filter made
in PTFE

Sintered PTFE
Pore size 50 μm

High chemical resistance
Maximal temp.: up to 180ºC
Response time t10/90: 14 s

Drying process
in chemical
applications.

0874-490-014

Filter made
of sintered
bronze

Sintered bronze
Pore size: 60 μm

High mechanical resistance.
To co-operate with high
pollution.
Applied at small air humidity.
Response time t10/90: 10 s

Agricultural
applications

 

Part number key

 

Example of application

Ordering information

Please refer to the data sheet for ordering keys and contact us for more information.

Part numbers

Parts Price

Part

P18000E0
P18 transducer, without outputs, sensor mounted, RS-485

Contact us

If you need any help, you can contact us in one of the following ways:

0116 284 9900

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