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Differential pressure transmitter

REG 21

Pressure measurement and regulation in a device



 

Differential pressure transmitter in control panel housing with two limit contacts

Special features

  • Accurate measurement of differential pressure with automatic zero-point calibration and high overload protection
  • Switching outputs can be used as 2-point regulator (pressure switch), for activating / deactivating a final control element (e.g. pump), with relay hysteresis
  • Switching outputs can be used as a 3-point regulator  (e.g. ON 1 - OFF - ON 2) for activating / deactivating two final control elements, (e.g. air intake / outflow fans), with relay hysteresis
  • Asymmetry also possible, e.g. 10 .. 40 mbar
  • High level of accuracy and long-term stability
  • Very little hysteresis; largely independent of temperature
  • 4 1/2 digit LED display
  • Output signal 0 .. 10 V, ± 5 V or 0/4 .. 20 mA
  • Selectable attenuation of the output signal up to 10 s
  • Choice of transistor or relay outputs as limit contacts
  • Can be calibrated

This differential pressure transmitter in a control panel housing is suitable for use as a 2- or 3-point controller thanks to its two integrated limit contacts. These permit the realisation, e.g. of ventilation controls, at low cost and without the need for additional electronics. Both the threshold values and the hysteresis for the controller are easy to set via the front keyboard. The display provides readings of measurement values directly on-site in Pa, kPa, inchH2O or mmH2O as well as information about the output states of the limit contacts. An adjustable time constant (up to 10 s) allows the instrument to generate an attenuated output signal, even under fluctuating pressure conditions. Cyclical self-calibration of the zero point ensures a high level of measurement accuracy. The instrument is available with an ISO factory calibration or DAkkS calibration certificate (optional).

Measurement ranges
50 / 100 / 250 / 500 Pa
1 / 2.5 / 5 / 10 / 20 / 50 / 100 kPa
(others available upon request)

Margin of error
0.5 % of max. value (min. 0.3 Pa) or
1 % of max. value (standard)

Output
0 .. 10 V (RL ≥ 2 kΩ)
± 5 V (RL ≥ 2 kΩ)
0 .. 20 mA (RL ≤ 500 Ω)
4 .. 20 mA (RL ≤ 500 Ω)

Power supply
24 VDC, +20 % / -15 %
24 VAC, +6 % / -15 % (50/60 Hz) with galvanic separation
115 VAC, +6 % / -15 % (50/60 Hz)
230 VAC, +6 % / -15 % (50/60 Hz)

Contact points (optional)
2 relays with floating changeover contacts 230 VAC (50/60 Hz), 6 A or
2 transistors with open collector UCE ≤ 50 V; IC ≤ 200 mA, floating

The instrument is available with an ISO factory calibration or DAkkS calibration certificate (optional).

 

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