Gefran WE Data Sheet

OIL FILLED MELT PRESSURE TRANSMITTERS

WE PERFORMANCE LEVEL ‘c’ SERIES

Output 4...20mA

The WE Performance Level ‘c’ series of Gefran, are
pressure transmitters for using in High temperature envi­ronment.
The main characteristic of this series is the capability to
read temperature of the media up to 315°C.
The constructive principle is based on the hydraulic tra­smission of the pressure.
The fluid-filled system assures the temperature stability.
The phisical measure is transformed in a electrical mea­sure by means the strain-gauge technology.

MAIN FEATURES

• Pressure ranges from:
0-17 to 0-1000 bar / 0-250 to 0-15000 psi

• Accuracy: < ±0.25% FSO (H); < ±0.5% FSO (M)

•Fluid-filled system for temperature stability

•Oil filling meets FDA requirements CFR 178.3620 and
CFR 172.878

•Oil filling volume:

WE0 (30mm3); WE1, WE2, WE3 (40mm3)

•1/2-20UNF, M18x1.5 standard threads; other types avai-
lable on request

• Other diaphragms available on request

• Autozero function on board / external option

• 17-7 PH corrugated diaphragm with GTP+ coating

GTP+ (advanced protection)
Coating with high resistance against corrosion, abrasion
and high temperature

AUTOZERO FUNCTION

All signal variations in the absence of pressure can be eli­minated by using the Autozero function.
This function is activated by closing a magnetic contact
located on the transmitter housing.
The procedure is permitted only with pressure at zero.

TECHNICAL SPECIFICATIONS

Accuracy (1)

Resolution 16 bit

Measurement range

Maximum overpressure
(without degrading performances)

Measurement principle Extensimetric

Power supply 13...30Vdc

Maximum current absorption

Output signal Full Scale FSO 20mA

Zero balance
(tollerance ± 0.25% FSO)

Response time (10...90% FSO) 8ms

Output noise (RMS 10-400Hz) < 0.025% FSO

Calibration signal 80% FSO

Power supply polarity reverse
protection

Compensed temperature range
housing

Operating temperature range
housing

Storage temperature range housing -40...+125°C

Thermal drift in compesated range:
Zero / Calibration / Sensibility

Diaphragm maximum temperature 315°C / 600°F

Zero drift due to change in process
temperature (zero)

Standard material in contact
with process medium

Thermocouple (model WE2) STD : type “J” (isolated junction)

Protection degree
(with 6-pole female connector)

FSO = Full scale output : (1) BFSL method (Best Fit Straight Line): includes combined
effects of Non-Linearity, Hysteresis and Repeatability.

H <±0.25%FSO (100...1000 bar)
M <±0.5%FSO (35...1000 bar)

0..17 a 0..1000bar

0..250 a 0..15000psi

2 x FS

1.5 x FS oltre i 500bar/7500psi

23mA

(40mA with relay optional)

4mA

YES

0...+85°C

-30...+85°C

< 0.02% FSO/°C

< 0.04 bar/°C

Diaphragm:

• 17-7 PH corrugated diaphragm
with GTP+
Stem: • 17-4 PH

IP65

MECHANICAL DIMENSIONS

WE0

D1

D2

D3

D4

D5

A

B

C

Ch

[Hex]

D1

D2

WE2

1/2 - 20UNF

ø7.8 -0.05

[ ø0.31” -0.002 ]

ø10.5 -0.025

[ ø0.41” -0.001 ]

ø10.67

[ ø0.42” ]

ø12.7

[ ø0.5” ]

5.56 -0.26

[ 0.22” -0.01 ]

11.2

[ 0.44” ]

15.74

[ 0.62” ]

16

[ 5/8” ]

M18x1.5

ø10 -0.05

[ ø0.394” -0.002 ]

WE1

D3

D4

D5

A

B

C

Ch

[Hex]

ø16 -0.08

[ ø0.63” -0.003 ]

ø16 -0.4

[ ø0.63” -0.016 ]

ø18

[ ø0.71” ]

6 -0.26

[ 0.24” -0.01 ]

14.8 -0.4

[ 0.58” -0.016 ]

19

[ 0.75” ]

19

[ 3/4” ]

WE3

NOTE : dimensions refer to rigid stem length option “4” (153 mm – 6”)

WARNING : For installation use a maximum tightening torque of 56 Nm (500 in-lb)