Models 711.12, 731.12

Differential pressure gauge

Copper alloy or stainless steel, scale ranges from 0.6 ... 1,000 bar

Selected documents
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Applications

  • Measurement of differential pressures or of two different pressures applied
  • Heating, ventilation and air-conditioning
  • For gaseous and liquid media that are not highly viscous or crystallising
  • Model 731.12 for aggressive media also

Special Features

  • Scale ranges from 0 ... 0.6 bar
  • Differential pressure with moving dial
  • Economical and reliable

Description

Design
2 independent measuring systems, parallel entries in line

Nominal size in mm
100, 160

Accuracy class
1.6

Scale ranges
0 ... 0.6 to 0 ... 1000 bar

Scale range must be selected in relation to the highest total pressure applied! In heating plants with circulating pumps, the overall pressure is usually defined as equal to the hydrostatic pressure plus the pump pressure. In order to ensure a good readability, the pressure differential to be indicated should be no less than 1/6 of the full scale range.

When ordering please state both pressures:
a) maximum pressure applied,
b) differential pressure

Pressure limitation
Steady: full scale value
Fluctuating: 0.9 x full scale value
Short time: 1.3 x full scale value

Operating temperature
Ambient:
-20 ... +60 °C
Medium:
Model 711.12: +60 °C maximum (soft soldered); +100 °C maximum (brazed)
Model 731.12: +200 °C maximum

Temperature effect
When the temperature of the measuring system deviates from the reference temperature (+20 °C):
max. ±0.4 %/10 K of full scale value

Ingress protection
IP 33 per EN 60 529 / lEC 529

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