Differential Pressure Gauges

Differential Pressure Gauge 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 NDP75 for aggressive media also Special Features Scale ranges from 0 ... 0.6 bar Differential pressure with moving dial Economical and reliable Design 2 independent measuring systems, parallel entries in line Nominal size in mm 75,100, 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 DP75:+60 °C maximum (soft soldered) +100 °C maximum (brazed) Model NDP75: +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 65 Process connection Model DP75: Cu-alloy Model NDP: stainless steel 2 x G ½ B, male, 22 mm flats, plus-connection back, minus-connection front (with + and- identified) Pressure elements Model DP75: < 100 bar: Cu-alloy, C-type, soft soldered ≥ 100 bar: stainless steel(SS304 or 316), helical type, brazed Model NDP75: Stainless steel(SS304 or 316), all pressure ranges, welded. Movement Cu-alloy, wear parts argentan Dial Aluminium, white, lettering black Pointer 1 standard pointer: Aluminium, black 1 scale pointer: Aluminium, white scaled ±50 % of main scale range Case Steel, black Window glass or tempered glass Bezel ring Inner Loop: Slip-on bezel, Steel Extension: welding,Square,steel,black. Options Other process connection Case and bezel ring of stainless steel Design with duplex scale (duplex pressure gauge) DIA100: liquid filling DIA100: measuring system, case, bezel ring stainless steel(ss304 or 316)and liquid filling ,medium temperature resistant up to max. 100 °C Subtracting movement (one pointer for differential pressure scale), location of reversed pressure connection: +-connection front, - -connection back, Cu-alloy or stainless steel(ss304 or 316) Panel or surface mounting flange Alarm contact subtracting movement Case material: Black steel(enameled) Ordering information Model / Nominal size / Scale range / Differential or duplex scale / Size of connection / Max. pressure applied / Differential pressure span / Options Modifications may take place and materials specified may be replaced by others without prior notice. Specifications and dimensions given in this leaflet represent the state of engineering at the time of printing.