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OPERATION & MAINTENANCE INSTRUCTIONS
DIFFERENTIAL PRESSURE INDICATOR — 105 / 106
A DESCRIPTION
The models 105 & 106 are all-metal Differential Pressure Gauges capable of operating at low differential pressures that
is suitable for full service applications in high pressure systems. The gauge has a multiple stack diaphragm capsule (in
model 105) or a single bellows (in model 106) sensor and a torque tube motion output. The sensor carries a direct
acting equalizing valve that fully protects it from over pressure in either the high to low or the low to high direction up
to the full static working pressure of the system.
The compact integral design of the models 105 & 106 results in a simple, basic design that is reduced to essential and
necessary elements with a high output motion and rugged construction.
DETAILS OF CONSTRUCTION
The sensor assembly is mounted between two pressure housings. One housing is the high side pressure inlet, the
second is the low side pressure inlet. The motion of the sensor rotates a hermetically sealed torque tube that operates
an output shaft that drives an external indicator and switch (es), when specified.
The indicating mechanism of the models 105 & 106 Differential Pressure Gauges is contained in a weatherproof dial
housing, that is solidly bolted and sealed to the differential pressure sensor unit. The output shaft from the sensor
bellows projects into the dial housing. The shaft is linked to a sensitive jewelled pointer movement through a lever
arm on the shaft. The linkage is a light small diameter polished wire which results in low friction and a self aligning
feature. The pointer movement is a standard pattern low-ratio gear movement with jewelled bearings on the pinion and
segment shafts. It can be easily adjusted for calibration of span and linearity. The input shaft lever arm is also
adjustable for linearity.The cover lens seals against a cushioned gasket in the dial housing.
SPECIAL FEATURE
The sensor is provided with an Over Pressure relief Valve (OPV). When the Differential pressure exceeds 130 % of the
range the OPV opens up and equalises the pressure between High pressure & Low pressure. similarly when low pressure
exceeds the sensor rating the OPV opens up and equalises the pressure between High pressure & Low pressure.
B SPECIFICATIONS
Model 105 Model 106
Pressure Housing Investment Casting Investment Casting
Sensing Element Multiple Diaphragm Capsule Seamless Bellows
Dial Size 6" Nominal 6" Nominal
Dial Pattern ( STD) Black letters on White Black letters on White
Dial Pattern (LLC) White letters on Black White letters on Black
Pointer Narrow Tip Narrow Tip
Zero Adjust Dial Adjustment Dial Adjustment
Dial Housing Die Cast Aluminium ( Std.) Die Cast Aluminium (Std.)
304 SS (Optional) 304 SS (Optional)
Lens Shatter Proof Glass Shatter Proof Glass
Mounting Panel or 2" Pipe or Wall Panel or 2" Pipe or Wall
Proceess Ports 1/4" NPTF @ Top & Bottom 1/4" NPTF @ Top & Bottom
with one pair plugged with one pair plugged
Switching (LLC) Option Refer Catalogue Refer Catalogue
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