BD Sensors PCB+ Operating Instructions

Certificate of quality and completeness

Type : ..................................................................
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Power supply : ..................................................................
Range : ..................................................................
Pressure overload : ..................................................................
Accuracy : ..................................................................
Technical inspection of offset : ..................................................................
Technical inspection of range : ..................................................................
Display data : ..................................................................
Manufacture date : ..................................................................
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Signature: : ..................................................................
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BD SENSORS s.r.o. Hradišťská 817 687 08 Buchlovice
PCB2
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Tel. 572 432 111 572 432 116 E-mail: sale@bdsensors.cz
Rev. 5/04
Operating instructions for
Pressure sensor, PCB+ type, two wires, 4 ... 20 mA

Description

Pressure sensors of the PCB+ type are used to measure very small pressures (relative and differential ones). The
measured pressure is sensed by a semiconductor strain-gauge sensor or a ceramic capacitive sensor. The sensors are
designed for gases. In case of a semiconductor sensor, gases have to be non-aggressive and dry.
The sensors are not manufactured in the EX design.
The sensors are adjusted at the factory. Further calibration has to be performed according to calibration instructions.
Selected technical parameters:
Pressure ranges: 0.6 kPa to 100 kPa
Accuracy: 0.5% (1%) of range according to range and type of used sensor
Supply voltage range: 19 to 31 VDC (12 to 31 VDC for sensor without display)
Influence of supply voltage on accuracy: max 0.05% of range / 10 V
4 to 20 mA, two wires (max. load ((Un (V) - 19) / 0.02) Ω)
Output signal:
Influence of load resistance: max.0.05% of range / 10 V
Power polarity reversal resistance and short circuit resistance at the output: permanent.
Operating range of temperatures :
Compensated range of temperatures :
Influence of temperature in the compensated range of temperatures
a. zero: 0.1 ... 1.8% of range / 10°C
b. range: 0.1 ... 1.8% of range / 10°C
Material of the box: ABS
Fig. 1 Mechanical dimensions: Fig. 2: Location of terminal blocks and adjusting elements on the
printed circuit board (view with the removed cover of the sensor in
a vertical position)

Mechanical assembly

The sensor should be fixed using four clips on the housing. The sensor cannot be placed in an immediate proximity
of interference sources (transformers, transmitters, motors) and heat sources. Shocks or vibrations at the installation
site can cause an error. Correctly, the sensor has to be mounted in a vertical position (pressure inlets oriented down).
In this position, the sensors are adjusted at the factory. This position prevents a condensate from the penetration into
the sensor. WARNING! Prior to mounting, make sure that there is no liquid in the threaded insert of the closed
valve. Remaining liquid has to be removed properly. The sensor cannot be mounted if there is liquid in the thread.
Connection of the measured pressure (using 1/4" hose)
The higher pressure is connected to the "+" inlet, the lower pressure to the "-" inlet. In case of a risk of water vapor
condensation, condensation loops have to be created on the hoses. The version of the sensor for measuring the
relative pressure includes only a single inlet. Blowing into pressure inlets is not allowed. Sensors to be used up to
100 mbar can be damaged or destroyed by air pressure from lungs.
semiconductor sensor capacitive sensor
°
-40°C to 80 C 0°C to 60°C
0°C to 60°C 10°C to 40°C
depends on the pressure range and the sensor type
depends on the pressure range and the sensor type