Differential pressure gauge，all-metal media chamber
For the process industry
Model
DP73
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 -1 … +30 bar [-14.5 ... 435 psi] to 0 ... 40 bar [0 ... 580 psi]
● High working pressure (static pressure) and high overload safety, selectable 40 bar [580 psi], 100 bar [1,450 psi], 250 bar [3,625 psi], 400 bar [5,800 psi] and 650 bar [9,425 psi]
● The transmission fluid in the measuring chamber dampens the indicator in caseof high changes of the rate of pressure
● Model DP73M: Monel version
Functionality
Design and operating principle
■ Pressures p1 and p2 act on the ⊕ and ⊖ sides of the measuring chamber.
■ The media chambers are separated from the transmission fluid-filled measuring chamber by one diaphragm element each.
■ The pressure difference between ⊕ and ⊖ sides deflects the diaphragm of the ⊕ side and displaces the transmission fluid.
■ The deflection is transmitted to the movement via the link.
■ The movement converts the deflection into a pointer rotation. Overload safety Through load take-up points with metallic seating for the diaphragm elements, the instrument can withstand extremely high working pressures with pressure ratings of PN 40 ... PN 650 (40 ... 650 bar [580 ... 9,425 psi]).
Specifications
Standard
Design | EN837-3 Diaphragm and capsule pressure gauges, dimensions, metrology, requirements and testing 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 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 2 diaphragm elements with transmission fluid |
Material | Diaphragm element Span ≤ 0.25 bar [3.63 psi] ■ Stainless steel 316L ■ Hastelloy C276
Span > 0.25 bar [3.63 psi] ■ Stainless steel 316L / NiCr alloy (Inconel) ■ 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 | Depending on scale range and pressure rating |
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] |
Static pressure influence
Other process connections on request
Material | Measuring flanges with process connection ■ Stainless steel 316L ■ Hastelloy C276 |
Sealing | FPM/FKM |
Venting of the media chambers | ■ Stainless steel 316L ■ Hastelloy C276 |
Diaphragm element | ■ Stainless steel 316L ■ Hastelloy C276 |
Material (in contact with the environment)
Other versions
■ Oil- and grease-free
■ For oxygen, oil- and grease-free
■ For hydrogen
■ Silicone-free
■ Per NACE MR 0175 / ISO 15156, use in H₂S-containing environments in oil and gas production
■ Per NACE 2) MR 0103 / ISO 17945, metals resistant to sulfide stress cracking
■ With pre-volume deflagration flame arrester 3) for connection to zone 0 (EPL Ga)
■ Differential pressure gauge with switch contacts, high overload safety,
■ Differential pressure gauge with electrical output signal, high overload safety
Dimensions in mm [in]
Process connection: 2 x G ½, female thread
Pressure ratings PN 40 ... PN 100
Pressure rating PN 250
Pressure ratings PN 400 ... PN 650
Accessories
Dimensions in mm [in]
Representation with mounting bracket for wall or pipe mounting and fitted 5-valve Manifold
Pressure ratings PN 40 ... PN 100
Pressure rating PN 250
Pressure ratings PN 400 ... PN 650
Model / Nominal size / Scale range / Scale layout (linear pressure or square root incrementation) / Max. working pressure (static pressure) ... bar / Process connection / Connection location / Options
