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Differential pressure gauges used with all liquid and gas process media, provided that these do not corrode stainless steel.

DIFFERENTIAL PRESSURE GAUGE with double bourdon tubes 

MDB series 

*Product Overview 

Differential pressure gauge with double bourdon tubes are designed to measure difference between 2 pressures. General type can be used to measure non-corrode medium and the corrosion-proof type is suitable for corrode environments. 

The instrument has 2 independent measuring systems. The measured pressure deflects the elastic elements, displacements then take place to actuate gear mechanisms through linkages to carry 2 pointers travelling over instrument dial, and an auxiliary dial shows the pressure difference. 


Dial diameter:4"(100mm);6"(150mm) 

Mounting:Bottom directly mounting (with front or back flange available) 

General type-Black steel(enameled) 
Corrosion-proof type-Stainless steel 304, IP55 

Lens:3mm plain glass (Organic or double layers available) 

Dial:Aluminum, black markings on white background 

Measuring Principle: 
General type-Two Bourdon tubes, copper alloy 
Corrosion-proof type-Two Bourdon tubes, stainless steel 316 

General type-Copper alloy 
Corrosion-proof type-Stainless steel 

General type-Tin-welding 
Corrosion-proof type-AISI 316 TIG Argon arc 

Pointer:Aluminum, black and red color (option:adjustable pointer) 

Male thread M20 x 1.5 (other sizes are available upon request) 
General type-Copper alloy 
Corrosion-proof type-Stainless steel 316 

Accuracy:±1.5% F.S. available made-to-order 

Temperature Limit:medium </=+60℃(Corrosion-proof type:</=100℃);ambient -20 to +60℃ 

Ranges:0.1;0.16;0.25;0.4;0.6;1;1.6;2.5;4;6 Mpa (other units available) 

The highest indicated value is the highest pressure permitted.

. We advice using the 1/2~1/3 of the range as static P. it is convenient to see if it is too small. Static P is not lower than 1/10 of full scale value. 
. The red pointer shows the plus pressure (the pressure input); the dial pointer shows the minus pressure (the pressure output). 
. The value could be saw by the angle α between the red and dial pointers (see directly on the dial pointer). 
And we can compute the difference using the pointed values of the red pointer and the dial pointer (Static P =P+ — P-). 
. It is suitable to measure gas and liquid medium, suggested in room in -20℃~60℃. 
. The general lowest range is 0.16MPa. it is could be made to 2.5% if 0.11MPa requested. 
. While mounting, the end should be deployed with pressure input terminal and the end should be deployed.