Wise P670 User manual

INSTRUCTION MANUAL
ITEM : DIFFERENTIAL PRESSURE GAUGE
MODEL : P670

Please read instructions carefully prior to using the instrument for proper and safe operations.
Mishandling could cause device malfunctions and result in disastrous injuries or accidents.
1. Do not exceed the pressure range allowed.
2. Do not use it to measure the pressure of corrosive fluid.
Damage or rupture of pressure gauge may cause release of fluid which could
lead to bodily injury or destroy surrounding area.
3. Do not apply excessive load, vibration or impact.
4. Please use within the specified temperature ranges.
Exceeding the temperature range may cause disruption in nearby area due to damage
to the temperature indicator.
5. Make sure to turn off the valve to prevent the measuring fluid leak when dismounting
the gauge.
6. Use a pressure gauge with no oil in an environment with hydrocarbon or oxygen.
Oil contained in the gauge may react with oxygen which may be flammable or explosive.
7. Please always follow the mounting instructions in the manual in cases of field installation.
8. Do not make any modifications to the product or to add more functions.
Please consult with us for any repair.
9. Be sure to close the valve and shut off the pressure before you open this product case.
Instructions for proper and safe operation
WARNING

1. Overview
2. Specification and standards
3. Structure and Function
4. Operating Principle
5. Use
6. Operation
CONTENTS

1. Overview
P670 differential pressure gauge is an indicator of
precise class by using a bellows, and is designed
with the structure that can protect the bellows
against excessive pressure, and can be used for
measuring the differential pressure of filter,
flow meter, etc. by using orifice, or for measuring
the water level of storage tank.
The external appearance of products is shown in (Fig. 1)
2. Specification and standards
1) Nominal diameter : 160mm
2) Accuracy : ±1.0%(or ±0.5%) of Full Scale
3) Static pressure : Max. 100 bar
4) Materials of wetted part :
MEASUREMENT DEVICE - ASTM A240 316L, ASTM B127( Monel 400 )
BODY - ASTM A351 CF8M
CASE COVER - ASTM A240 304
5) Connection type : NPT1/4" (F)
6) Accessories : 3-WAY / 5-WAY MANIFOLD, 1/2" NPT (F)
2 inch Mounting Bracket
( Fig. 1 )

3. Structure and Function
⑨②
⑥
①
⑤
③⑦
⑧
④
NO.
①
②
③
⑤
⑧
⑨
160mm
⑥
FUNCTION
Differential pressure
scale plate
Zero adjustment screw
Connection tube for the differential pressure gauge
body and 3-way manifold
Adjust zero point according to the mounting
p
osition.
④
A device that releases air from the piping to the
outside in pressure transducing.
A device that enables valve to be opened in
consecutive order in pressure transducing, in order
to prevent a differential pressure gauge from being
damaged.
Pressure measurement equipment to which a
measurement device is mounted.
Differential pressure
gauge body
Impulse pipe
3-WAY MANIFOLD
U- bolt
Air vent
Mounting bracket
⑦
OIL CAP
REMARKSNAME
Indicate pressure difference between two
points, and flow rate.
Cap of inlet through which oil is injected into case
A device that fastens the mounting bracket to 2-
inch pipe
A device used in case of intending to mount a
differential pressure gauge on measurement
LOW
PRESSURE
HIGH
PRESSURE

4. Operating Principle
②①
③
④
1) If pressure comes in the pressure transducing part of high pressure side and the pressure
transducing part of low pressure side, ① bellows will shrink by differential pressure between
two points. Then, ②ROD connected to the bellows moves in the right and left direction.
And ③SHAFT and ④POST, which is connected to the indicating part of differential
pressure gauge, rotates by this moving distance, and indicates differential pressure.
2) In case of bellows, high pressure side and low pressure side is made to be separated.
And a uniform moving distance is made to occur by combination with spring according
to the differential pressure range.
LOW
PRESSURE
HIGH
PRESSURE
LOW
PRESSURE
HIGH
PRESSURE

5. Use
1) To prevent differential gauge measuring set damage, operate the differential gauge along
with the 3-way manifold all the time and check both the high and low sides before it is
installed on the manifold.
2) The differential gauge should be installed as a higher position than the pressure diffuser
during gas differential pressure measurement and lower than it during liquid differential
pressure measurement.
3) Connect the measuring tube pressure diffuser in such a way to set the upstream to the
high pressure and the downstream to the low pressure. During water level checking,
set the lower part to the high side and the upper part to the low side for the pressurizing
tank but connect the lower part to the high side and open the low side to the atmosphere
for the open tank for atmosphere.
4) In case of corrosive fluid, you must choose anticorrosive diaphragm or side diaphragm.
5) In case you choose a side diaphragm and its high side and low side are not installed at the
same point, be sure to conduct zero point adjustment after differential gauge installation.
(Zero point is adjusted by turning zero adjustment screw inside case after
removing an oil cap on the top of differential pressure gauge case. )
6) In case of operation in hot fluid, use a seal pot to keep the differential gauge incoming
fluid under the set temperature.

6. OPERATIONS
1) Operation of the three-way valve
① Equalizing Valve
② Low Pressure Valve (LP Valve)
③ High Pressure Valve (HP Valve)
Fig. 6-1
(1) For initial setup, all the valves must be closed
(2) After complete installation, first release Equalizing valve, then replease HP valve at this
point check whether the pointer is pointing at "0", if there is an error, must perform
zero adjustment.
(3) Before operating other valves, make sure all the air is out of the DP gauges by opening
the air vent at the top of the housing. left over air could cause error in measuring DP.
(4) Then, open LP valve. after opening LP valve, close the Equalizing valve,
Then make sure it is indicating correct value. now, it is ready to use.
2) In case of DP gauge is malfunctioning, release Equalizer valve,
Then close LP valve. now, close HP valve, then close equalizer valve.
Release all the air inside the DP gauge by opening up the air vent.
Now take DP gauges to manufacturing for repair service.
Differential pressure gauge
Process line
(3-WAY VALVE)
P991
Low
Pressure
High
Pressure