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Differential Pressure Transmitter

PascalDat 20 Differential Pressure Transmitter. Measurement range: +/- 20 Pa.
PascalDat 100 Differential Pressure Transmitter. Measurement range: +/-100 Pa.
The PascalDat is a high precision instrument for measuring and controlling pressure differences in the
low range, for example in cleanroom systems.
The measurement method is based on the principle of mass flow measurement.
This method requires no moving parts (e.g. diaphragm) and so enables very high accuracy, reproducibility, reliability and long-term stability. The instrument is very small and designed for cleanroom compatibility.

Differential Pressure Transmitter

Model  Description 
PascalDat 20  Differential Pressure Transmitter. Range: 0 - 20 Pa
PascalDat 100  Differential Pressure Transmitter. Range: 0 - 100 Pa

The gauge is available in two versions.
PascalDat 20 is for applications in a measurement range of -20 to +20 Pa (-0.08 to +0.08inH2O) and
PascalDat 100 in a range of -100 to +100 Pa (-0.4 to +0.4 inH2O).
A digital interface (RS 232) and an analog output (0 ... 10 V, 2 ... 10 V, 0 ... 20 mA or 4 ... 20 mA) indicate the pressure difference.
The analog output can be configured and calibrated, so that the measurement range can be adjusted
to match the signal range (e.g. 5...10 Pa = 4...20 mA) as well as to a following connected device.

No mechanical moving parts (e.g. diaphragm)
in the measurement cell.
Very low accuracy error < ±0.25% FS (full scale)
or < ±1.5%m.V.(measured value) whichever is larger.
Very low offset drift <0.1Pa/year.
No hysteresis.
Insensitive to vibrations.
Not damaged by high differential pressures
up to 2 bar.
Clean room compatible designed


Different output signals, selectable.
Analog output signal can be configured and
calibrated.
Ease of calibration (Zero and Gain) Clean room
compatible designed
Customer specific configuration is possible.
Quick and simple programming with
PascalTool-Palm or Palm Emulator on PC.
Easy compensation of hose length by configuration
software


Differential Pressure Transmitter specification
Type PascalDat 20 PascalDat 100
Measurement range -20 ... +20 Pa -100 ... +100 Pa
Max. resolution 0.016 Pa 0.07 Pa
Measurement interval 150 ms ... 1350 ms 150 ms ... 1350 ms
Time constant 10 ms 10 ms
Measurement accuracy (at 20°C/50%RH)
(m.V. = of measured value)
< 4 Pa = ± 0.05 Pa
>/= 4 Pa = ± 1,5% m.V.
< 17 Pa = ± 0.25 Pa
>/= 17 Pa = ± 1.5% m.V.
Temperature effect < 0.05% m.V./°C < 0.05% m.V./°C
Atmospheric pressure effect (at 1013.25 hPa) 0.1% m.V./hPa 0.1% m.V./hPa
Hysteresis 0.00% 0.00%
Offset drift (at constant Temp. 20°C) < 0.1 Pa/year < 0.1 Pa/year
Max. permissible differential pressure ± 2 bar ± 2 bar
Max. permissible overpressure 2 bar 2 bar
Max. mass flow through the sensor 120 sccm (0.12 liter/min) 370 sccm (0.37 liter/min)
Operating temperature range 0 ... 50°C 0 ... 50°C
Analog output (configurable and calibratable) 0 ... 10 V, 2 ... 10 V (load to ground >10 kOhm)
0 ... 20 mA, 4 ... 20 mA (load <500 Ohm)
Digital interface RS 232 (ASCII-string or complex protocol)
Power supply 10 ... 35 VDC 10 ... 35 VDC
Power consumption max. 3 W max. 3 W
Protection IP 54 / EMC IP 54 / EMC