DIFFERENTIAL PRESSURE GAUGE BOURDON TUBE TYPE The Model 179 Differential Pressure Gauge consists essentially of two opposing bourdon tubes, each having its own connection but operating a common pointer that shows the difference between the two pressures. Used in applications that require an instrument to measure the difference between two pressures where the system pressure is up to 4x greater than the differential range. The gauge is designed to withstand full working pressure, applied separately to either connection or together. The maximum working pressure should not be exceeded even temporarily, so the possibility of surging pressures should be considered when selecting the instrument. These instruments can also be supplied with a central zero scale if necessary, e.g. 1 to 0 to 1 bar (corresponding to a differential pressure range of 2 bar in the table below). Please contact our sales office regarding higher graduations. Surface Mounting - Model 179F Flush Mounting - Model 11/179 Case & Bezel Die cast Aluminium, Grey finish Scale Ranges Equivalent units of pressure / vacuum available Option: Central Zero Scales e.g. 1-0-1 bar Pressure Element Beryllium Copper Bourdon Tubes and Brass (Suffix BC) 316 St Steel Bourdon Tubes and 316 St Steel body (Suffix Z) Monel Bourdon Tubes and Monel body (Suffix M) Pressure Connection Accuracy Class Options: for lower or higher operating temperatures, please contact our Sales Office White anodised Aluminium with black scales Option: Dual scales or special dial markings are available Maximum Working Pressures All instruments are individually calibrated and have an unique Serial Number printed on the dial. A Certificate of conformity traceable to National Standards is supplied free of charge. Certification available Point by point Certificate All units are manufactured to comply with EN 837-1 and other regulatory standards including P.E.D. Installation instructions Temperature Effect Variation in indication caused by temperature shall not exceed t, is the reference ambient temperature in degrees Celsiu: t2 is the ambient temperature in degrees Celsiu:

Model : 179F Dimensions Model No 179F 11/179 11/179 Type of Mounting 150mm Surface 150mm Flush Panel 150mm 3 Hole Fixing A 155mm 155mm 155mm B 180mm 172mm 172mm C 164mm D 6mm 164mm 6mm E 48mm 48mm 48mm F 40mm 40mm 40mm G 80mm 80mm 80mm H 39mm 39mm Accessories Electric Contacts Model 144 Magnetically assisted contacts can be fitted as Single or Double units - See separate Datasheet on Electric Contacts Valves We can supply 3 or 5 Valve manifolds with our differentials – See separate Datasheet on 3 & 5 Valve manifolds. The manifolds in addition to allowing the instrument to operate normally allows...