Differential pressure gauge，
For the process industry, all-metal media chamber
Model
DP73.31, DP73.51
Application
● For gaseous and liquid aggressive media that are not highly viscous or crystallising, also in aggressive environments
● Pump monitoring and control
● Filter monitoring
● Level measurement on closed vessels
Special features
● Differential pressure measuring ranges from 0 … 1.6kPa to 0 ... 4MPa
● High working pressure (static pressure) up to 4MPa
● High overload safety up to 4MPa
● Model DP73.31: Case with safety level “S3” per EN 837
● All-welded media chamber
Functionality
Design and operating principle
■ Media chambers of the ⊕ and ⊖ side are separated by the diaphragm element
■ Metal bellows isolate the media chambers from the atmosphere
■ The pressure difference between ⊕ and ⊖ side leads to an axial pressure element deflection
■ The deflection is transmitted to the movement via the link
■ The movement converts the deflection into a pointer rotation
Overload safety
Diaphragm elements have a relatively large actuating force and, due to the annular clamping of the element, they are less sensitive to vibration in comparison with Bourdon tubes. Diaphragm elements can be subject to a higher overload of up to 10 times the full scale value, up to a max. of 40 bar, through load take-up points with metallic seating.
Specifications
Standard
Design | DIN 16003 Pressure measuring instruments for differential pressure |
Nominal size(mm) | 100，160 |
Window | Laminated safety glass |
Connection location | Lower mount (radial) Other connection locations on request |
Case | Design Safety level “S1” per EN 837-1: With blow-out device Safety level “S3” per EN 837-1: With solid baffle wall and blow-out back Material Stainless steel 1.4404 (316L) Stainless steel 1.4571 (316Ti) |
Case filling | ■ Without ■ Glycerine-water mixture ■ Silicone oil Instruments with case filling with compensating valve to vent case. |
Venting of the media chambers | Span ≤ 0.25 bar [3.63 psi] With venting Span > 0.25 bar [3.63 psi] ■ Without ■ With venting |
| Movement | Stainless steel |
Measuring element | Type of measuring element Diaphragm element |
Material | Span ≤ 0.25 bar ■ Stainless steel 316L ■ Hastelloy C276
Span > 0.25 bar ■ Stainless steel 316L ■ Hastelloy C276 |
Accuracy specifications | Accuracy class ■ 1.6 ■ 2.5 ■ 1.0 (application test required) |
Zero point setting | Instruments with case filling ■ Without ■ External setting
Instruments without case filling ■ Without ■ Setting by means of adjustable pointer |
Influence of static pressure | Span ≤ 0.25 bar ±0.3 %/1 bar Span > 0.25 bar ±0.04 %/1 bar |
Temperature error | On deviation from the reference conditions at the measuring system: ≤ ±0.5 % per 10 °C [≤ ±0.5 % per 18 °F] of full scale value |
Reference conditions | Ambient temperature +20 °C [+68 °F] |
Scale ranges(bar)
0 ... 0.25 | 0 ... 0.4 | 0 ... 0.6 | 0 ... 1 | 0 ... 1.6 | 0 ... 2.5 |
0 ... 4 | 0 ... 6 | 0 ... 7 | 0 ... 10 | 0 ... 14 | 0 ... 16 |
0 ... 20 | 0 ... 25 | 0 ... 30 | 0 ... 40 |
|
Vacuum and +/- scale ranges(bar)
-0.6 ... 0 | -1 ... 0 | -1 ... +0.6 | -1 ... +1.5 | -1 ... +3 | -1 ... +5 |
-1 ... +9 | -1 ... +15 | -1 ... +24 |
|
|
Scale design
Unit | mbar, bar, psi, kPa, MPa, mmH2O, inH2O, kg/cm2,Other units on request |
Overload safety and max. operating pressure (static pressure) | The possibility of selection depends on the scale range. |
Dial | Scale layout Single scale Dual scale Material Aluminium |
Pointer | Instrument pointer |
Dimensions in mm[in]
Process connection: 2 x G 1/4, female thread
Models DP73.31.010 and DP73.31.030
Models DP73.51.010 and DP73.51.030
Accessories
Dimensions in mm [in]
Representation with mounting bracket for wall or pipe mounting and fitted 5-valve Manifold
Ordering information
Model / Nominal size / Scale range / Scale layout (linear pressure or square root incrementation) / Max. working pressure (static pressure) ... bar / Process connection / Connection location / Options
