Arthur Grillo PFT22 Betriebs- und Installationsanleitung - Seite 5

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Product description

Our PFT are combined measuring transducers for the measurement of rel. humidity and

temperature.

Special features of the individual devices:

PFT22

- Two analog outputs:

1. Temperature with four switchables measuring ranges

2. relative humidity.

PFT25

- Two analog outputs:

1. Temperature -30...+50 °C

2. relative humidity, dew point temperature, enthalpy;

Special version: Absolute humidity

PFT28

- Display

- Selectable analog output: 0/2...10 V or 0/4...20 mA

- Two analog outputs:

1. Temperature -30...+50 °C

2. relative humidity, dew point temperature, enthalpy;

Special version: Absolute humidity

For the application areas of sewer / pipe systems, indoor area or in the outdoor and wet

area, we provide various special designed housings.

Our PFT22 and PFT25 are both designed as two-wire technology with two output signals

of 4...20 mA or as three-wire technology with two outputs of 0...10 V. The supply voltage

of the two-wire technology is 15...30 Vdc, in three-wire technology it is 24 Vdc or 24 Vac.

As PFT28 it is supplied with 15...30 Vdc or 24 Vac, with a jumper the output signals can be

switched from 0/2...10 V to 0/4...20 mA.

2.1 Intended use

The combined transducers of the PFT series are used for measuring / signal transmission

of relative humidity and temperature in the application area of heating and air-conditioning.

2.2 Functional description

Our PFT devices are equipped with a single-chip sensor for an optimal measurement of

relative humidity and temperature. Depending on the application the sensor chip is located

in a stainless steel probe tube or is housed directly in an ABS plastic housing. The signi-

ficant parts of sensors are: Two sensor units (capacitive measuring principle for relative

humidity and semiconductor principle for temperature), a signal amplification, a 14-bit

A / D converter and a digital two-wire interface. Furthermore, there is a OTP memory

located on this chip, which stores the calibration data of both capturing principles. The

signal transmission from sensor to evaluation electronics takes place digitally. The sensor

Doc.-no.: PFT_01_EN

PRODUCT DESCRIPTION

Issue: 05/2017