P740 Differential Pressure Gauges Diaphragm Type

APPLICATIONS

Differential pressure measurement with a high differential pressure overload and/or high working pressures (static pressures), also in aggressive ambient

For gaseous, liquid, viscous and aggressive media

Monitoring and control of pumps

Filter monitoring

Level measurement in closed tanks

DESIGN

High over pressure safe on either sides

Pressure rating PN40,100, 250 or 400

Hydraulic cushioning protection against rapid pressure changes

The torque pipe seals with bearing , assures a frictionless path

Overpressure protection in both directions up to the max static pressure rating.

CASE DIAMETER

4”(10) and 6”(160mm)

ACCURACY CLASS  (1)

Stainless steel AISI 316L : 1.6

Monel 400(2.4360) : 2.5

Hastelloy C 276 : 1.6

(1) at 20°C and zero static pressure

SCALE RANGES

0...60 mbar to 0...160 mbar (gauge body DN140)

0…250 mbar (gauge body DN100)

0...0.4 bar to 0...40 bar (gauge body DN88)

Or equivalent other units of pressure, vacuum or combined pressure and vacuum

OVER PRESSURE SAFETY AND MAX. STATIC PRESSURE

Max. static pressure on either side : 40,100, 250, or 400 bar

Overpressure safety 400 bar only for ranges : 0...0.4 bar to 0...40 bar

OPERATING TEMPERATURE

Ambient : - 20/ + 60 °C

Process fluid : + 100°C max.

TEMPERATURE ERROR

± 0.6 % / 10K of full scale value, when temperature of the pressure element deviates from +20°C

ZERO SHIFT

Max. ± 2% at 20°C and max static pressure

PROTECTION CLASS

IP 65 – EN 60529/IEC 529

STANDARD FEATURES MEASURING FLANGES

Stainless steel AISI 316L

PROCESS CONNECTION

2 x 1/4 ” NPT-Female (EN 837) Lower

PRESSURE ELEMENTS

Double diaphragm

Ranges:

≤16 bar Stainless steel 316L

>16 bar Inconel 718

Internal stop without o-ring

DIAPHRAGM SEALING RINGS

FPM(Viton®)

PURGING PLUGS

2 x 1/4 ” NPT-M

Stainless steel AISI 316L

BOLTS

Stainless steel AISI 304 (PN100 bar max.)

Alloy steel zinc flake coated , ROHS complaint

(PN 250 and 400 bar)

MOVEMENT

Stainless steel with bearing

DIAL

Aluminum with black markings on white background

POINTER

Adjustable, black aluminum

External zero adjustment with filled case and/or electrical contact or diaphragm seals

CASE AND RING

Material : stainless steel AISI 304

Style : bayonet ring

WINDOW

Laminated safety glass ,1.6”(4mm) thickness

CHAMBER FILLING FLUID

Silicone oil

MOUNTING

Stem mounting

Symbols (+) higher pressure and(-) lower pressure engraved on body identify pressure entries

OPTIONS

Case and ring AISI 304 5”(125 mm)  USA type

Case and ring AISI 316 4” and 6”

Scale range 0…40 mbar (dial arc 180°)

Other threaded process connections

Connection at 12 o’clock

Capillary cooling when pressure medium temperature > 100°C

Panel mounting flange with 2”pipe bracket

Surface mounting flange

2”pipe mounting bracket stainless steel AISI 304 or 316

Plastic window (not in ATEX execution)

Special dial layout

Glycerin filled case (+15/+60°C)

Silicone oil filled case (- 40/+60°C)

Other chamber filling fluid such as compatible with food processes or for oxygen service (static pressure max.100 bar)

Pressure equalizing valve or 5way

Maximum reading pointer

Stainless steel tag plate

Wetted part component sin Alloy 400 or Hastelloy C 276

Diaphragm Alloy 400, Hastelloy C 276

Electric contacts (3)

Diaphragm seals for range DP 250 mbar (4)

ATEX execution II2GDc

Notes

3) ATEX execution : contact under dial see drawings, inductive contact :

PTB 99 ATEX 2219X / PTB 00 ATEX 2049X, ZELM 03 ATEX 0128X,

for further information please see data sheet CE electrical contacts

4) Large volume diaphragm seal for DP

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