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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.
D
C
ETAILS OF
ONSTRUCTION
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.
S
F
PECIAL
EATURE
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
Pressure Housing
Sensing Element
Dial Size
Dial Pattern ( STD)
Dial Pattern (LLC)
Pointer
Zero Adjust
Dial Housing
Lens
Mounting
Proceess Ports
Switching (LLC) Option
Model 105
Investment Casting
Multiple Diaphragm Capsule
6" Nominal
Black letters on White
White letters on Black
Narrow Tip
Dial Adjustment
Die Cast Aluminium ( Std.)
304 SS (Optional)
Shatter Proof Glass
Panel or 2" Pipe or Wall
1/4" NPTF @ Top & Bottom
with one pair plugged
Refer Catalogue
Model 106
Investment Casting
Seamless Bellows
6" Nominal
Black letters on White
White letters on Black
Narrow Tip
Dial Adjustment
Die Cast Aluminium (Std.)
304 SS (Optional)
Shatter Proof Glass
Panel or 2" Pipe or Wall
1/4" NPTF @ Top & Bottom
with one pair plugged
Refer Catalogue
1
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Summary of Contents for Switzer 105
- Page 1 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.
- Page 2 C OPERATING LIMITATIONS Our Warranty of the Differential Pressure Unit will not apply if the following limitations are exceeded : EMPERATURE (–) 60° F. to + 200° F RESSURE Units are capable of line pressures up to the MWP ( printed on the dial ) without damage or permanent change in calibration.
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Page 3: Flush Panel Mounting
LUSH OR ANEL OUNTING Remove the gauge cover and provide a hole in the panel as per the mounting dimensions. Mount the gauge with the foue M5 mounting studs & nuts. Orient the axes of the dial for readability and appearance and wrench tighten the retaining nuts. - Page 4 100 percent, of full-scale differential to the HP housing. Exercise care to always approach the desired scale reading from the low D/P side; if you overshoot and drop back to the reading, your calibration will be incorrect. Repeat the procedure, by reducing pressure and stopping at the same scale readings, now taking care to always approach readings from the high D/P side.
- Page 5 K D.P.GAUGE PIPING DIAGRAMS FOR STEAM SERVICE (FIG.2) START UP Recommended when Instrument located above primary element and where self draining is possible& for operating temperature upto 200°F 1. Whatever the location of the meter body, make all primary element taps at or near top of pipe 2.
- Page 6 FOR GAS SERVICE (FIG.5) START-UP Recommended when Instrument located above primary element and where self draining is possible NOT recommended when hydrates are present 1. Whatever the location of the meter body, make all primary element taps at or near the top of the pipe. 2.
- Page 7 FOR LIQUID SERVICE (FIG.8) START-UP Recommended when the flowing medium volatile or gassy liquids. Make all primary element taps at or near bottom pipe. CAUTION: Maximum operating temperature permissable 200°F(93°C). For higher temperature media, follow as explained in clause H. With hot or gassy fluids, disconnect instrument and fill both Housings and piping though manifold with process fluid cooled to below 200°F, then reconnect.
- Page 8 FOR COOL or HOT LIQUID SERVICE START-UP Recommended for use to cancel out the “dead leg” (piping from tank bottom to centerline of meter body) when meter is mounted below tank. Process medium can be used as reference leg seal fluid if it will condense in the leg under all conditions.
- Page 9 FOR LIQUID GASES SERVICE (FIG.13) START-UP Recommended for use with CO, Butane, Propane, Freon, and other liquified gases warmer than–150°F (–101°C). Meter may be mounted above or below tank. Vapour generator is a 12" length of 1" to 1½" diameter pipe; avoid traps or pockets between vapour generator and tank.
- Page 10 M TROUBLESHOOTING If trouble occurs, it is recommended that the routine shown below in tabular form be followed : i f i l l a c i f l l a . y l l a i r t s i l ( .
- Page 11 N MAINTENANCE Periodic inspection and cleaning of the D.P .Gauge is standard recommended practice. Recalibration, unless required because of a defective component or workmanship, is also considered a normal maintenance function. EMOVING THE NSTRUMENT FROM ERVICE Close the H.P. primary element shutoff valve. Open bypass vale in the line between the seals (where applicable) Close the low pressure primary element shutoff valve.
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