Diaphragm Pressure Gauge- Capillary Type Pressure Gauge

Posted by jsbsheng on June 19th, 2017

Diaphragm Pressure Gauge Overview

Diaphragm pressure gauge (chemical seals pressure gauge) is composed of a conventional pressure gauge, connector and a diaphragm seal. This combination enables a general industrial purpose pressure gauge to measure media of strong corrosion, high temperature, and high viscosity, containing suspended matter or crystallizing. Diaphragm pressure gauges are universally used in petrochemical, alkali, and chemical fiber, pharmaceutical, metallurgical, and food industries. We are a China Diaphragm pressure gauge manufacturer, we supply cheap custom diaphragm pressure gauge but still with robust and stable quality. Custom diaphragm seal pressure gauge, such as sanitary pressure gauge, capillary type pressure gauge, flanged pressure gauge, flush mount pressure gauge, high temperature pressure gauge.,etc. welcome to send your drawings or your technical specifications for pressure gauge diaphragm type. We will design for you.
 

Configuration Principle of Diaphragm Pressure Gauge

This illustration shows the operating principle of the pressure gauge with diaphragm seal. The diaphragm is deflected by the pressure of medium P, and an equivalent pressure P is generated. With transmitting through working fluid, the pressure P. deflect the elastic element of a pressure measuring instrument which thereafter shows the pressure value.

Level Difference of Diaphragm Pressure Gauge Seals Liquid

When a sealed diaphragm pressure gauge is mounted with pressure gauge and diaphragm seal at different positions, the effect of level difference should be taken into consideration (especially for a diaphragm gauge with capillary).As the illustration shows, with a S.G of the working fluid at approx.1, and level difference of 1m, the pressure difference of Diaphragm manometer is approx.0.001Mpa.
Temperature Influence of diaphragm pressure gauge

Temperature Influence of diaphragm pressure gauge

The temperature influence of a pressure gauge diaphragm type is relative to expansion coefficient of the seals working fluid, rigidity of the diaphragm, and temperature of pressed part. When working temperature deviates from 20±5°C,the indication varies within 0.1%/°C for rigid system, and within 0.1+0.025L%/°C (L-length of capillary in m.) for flexible system (remote mounting). Diaphragm manometer is filled with suitable working fluid according to different operating conditions.
 
Working Fluid
Temperature range for Diaphragm equipment
Specific Gravity
g/cm2
Factor of Expansion 1/°C
Glycerin-Water Solution
-5-100°C
1.27
0.61×10- 3
Silicon (low viscidity)
-40-130°C
0.94
1.08×10- 3
Silicon (high viscidity)
-30-240°C
1.07
0.95×10- 3
Fluorocarbon Oil
-30-160°C
1.93
0.75×10- 3
Vegetable Oil
-5-100°C
0.93
1.03×10- 3
Or other special working fluid

Corrosion-Proof Properties of diaphragm pressure gauge

Our Diaphragm Seal Pressure Gauge satisfies customer’s requirements of both environmental conditions and flow conditions (corrosive media) based on its significant corrosion-proof properties. Choose various diaphragm pressure gauges combined with appropriate separator according to environmental conditions. Choose material of chemical seal diaphragm and housing compatible with corrosive media.
①.DiaphragmMaterial: SUS316,SUS316L,Monel (Cu30Ni70),Hastelloy(HC276), Tantalum (Ta), Fluoroplastic (PTFE)coated
②.BodyMaterial: 1Cr18Ni9Ti,SUS316, SUS316L,Fluoroplastic (F4), Fluoroplastic Coated Stainless Steel
③.GasketMaterial: Nitrile Rubber, Viton, Silicone Rubber, Fluoroplastic
Options for diaphragm material
 

Anti-corrosion materials for diaphragm pressure gauge

CorrosiveMedia
SUS316L
Tantalum
Monel
Hastelloy
Ti
PTFE
Vitriol(H2so4)
×
Nitric acid(HN03)
×
Muriatic acid (HCI)
×
×
Phosphoric
acid (H3P04)
×
Acetate (CH3COOH)
(NaOH)
Pure alkali (Na2CO3)
Saleratus (NaHC03)
Chlorine (Cl)
Dry:V. Wet:×
Dry:∨. Wet:×
Dry:×. Wet:〇
Bromine (Br2)
Dry:V. Wet:△
Dry:〇. Wet:×
Ammonia (NH3)
×
×
Sea water (30% NaCI)
Remark:〇-best; △-conditional; ∨-use; ×-no using.
Standard material for Diaphragm manometer is SUS316L,corrosion-proof materials should be applied in normal temperature.
 

Diaphragm Pressure Gauge Model Selection

Item
Code
Description
Basic Type
Y
Generalservice pressure gauge
Material
F
Stainless steel Pressure Gauge (Option)
Function
ZT
With resistance transmitting
N
Oil filled Pressure Gauge (anti-vibration)
XC
Snap-action electric contact pressure gauge
SZ
Three pointers
S
Others
Diameter
60
Φ60
100
Φ100
150
Φ150
 
Others
Connectors
*refer to table 5
Z
Direct Mounting (Medium< 80°C)
Z1
Damper(Medium< 80°C)
Y1
Capillary(Medium< 200°C)
R1
Radiator(Medium< 200°C)
G1
OverpressureProtector(Medium< 80°C)
C
Special Angle(Medium< 150°C)
R4
Siphon (1,2,4,6 meters)
Diaphragm Seals
*refer to table6
F8
Diaphragm seal with thread connection
F1
I-Shape Flange
F2
diaphragm seal with flange connection
F4
Angle Adjustable
F5A
Extended Thread
F5B
Extended Flange
F6
Tri-Clamp Connection
F7
Threaded Connection (Sanitary Type)
F9
In Line Diaphragm Seals
Diaphragm Material
1
Stainless steel 316
2
Stainless steel 316L
3
Hastelloy
4
Monel
5
Tantalum
6
PTFE
Range
M***
(Refer to range table 4)
Option
 
Flange size and standard
 
 
Table of Pressure Gauge Ranges
Code
Ranges
Code
Ranges
Code
Ranges
M500
-0.1~0MPa
M030
0.1Mpa
M180
4Mpa
M510
-0.1~0.06Mpa
M040
0.16Mpa
M200
6Mpa
M520
-0.1~0.15Mpa
M060
0.25Mpa
M220
10Mpa
M530
-0.1~0.3Mpa
M080
0.4Mpa
M230
16Mpa
M540
-0.1~0.5Mpa
M100
0.6Mpa
M240
25Mpa
M550
-0.1~0.9Mpa
M120
1Mpa
M270
40Mpa
M560
-0.1~1.5Mpa
M140
1.6Mpa
M280
60Mpa
M570
-0.1~2.4Mpa
M160
2.5Mpa
 
 
 
Example of Diaphragm Pressure Gauge
Example of Diaphragm Pressure Gauge

Connectors of Example of Diaphragm Pressure Gauge

G1 Over pressure Protector
Y1 Capillary
G1 Over pressure Protector
Y1 Capillary
R1 Radiator
Z1 Damper
R1 Radiator
Z1 Damper
R4 Siphon
C Special Angle
R4 Siphon
C Special Angle
 
Pressure Gauge Diaphragm Seals
F8 Diaphragm seal with thread connection
 
F1 I-Shape Flange
F8 Diaphragm seal with thread connection
F1 I-Shape Flange
F2 diaphragm seal with flange connection
F4 Angle Adjustable
F2 diaphragm seal with flange connection
F4 Angle Adjustable
F5A Extended Thread
F5B Extended Flange
F5A Extended Thread
F5B Extended Flange
F6 tri-Clamp Connection(Sanitary Type)
F7 Threaded Connection (Sanitary Type)
F6 tri-Clamp Connection(Sanitary Type)
F7 Threaded Connection (Sanitary Type)
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