Gefran WE SERIES Data Sheet

OIL FILLED MELT PRESSURE TRANSMITTERS

WE SERIES Output 4...20mA

The WE 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:
0-35 to 0-1000 bar / 0-500 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

• Drift Autocompensation function (SP version)

• 17-7 PH corrugated diaphragm with GTP+ coating for
ranges below 100 bar-1500 psi

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.

AUTOCOMPENSATES INFLUENCE OF MELT
TEMPERATURE

Thanks to internal self-compensation, the WSP series
transmitter cancels the effect of pressure signal variation
caused by variation of Melt temperature.
This reduces at the minimum the read error caused by
heating of the filling fluid (typical of all sensors built with
“filled” technology).

TECHNICAL SPECIFICATIONS

Accuracy (1)

Resolution

Measurement range

Maximum overpressure
(without degrading performances)

Measurement principle

Power supply

Maximum current absorption

Insulation resistance (at 50Vdc)

Output signal Full Scale (FSO)

Zero balance
(tollerance ± 0.25% FSO)

Zero signals adjustment
(tollerance ± 0.25% FSO)

Span adjustment within ± 5% FSO

Maximum allowed load

Response time (10...90% FSO)

Output noise (RMS 10-400Hz)

Calibration signal

Output short circuit ingress and reverse
polarity protection

Compensed temperature range

Operating temperature range

Storage temperature range

Thermal drift in compesated range:
Zero / Calibration / Sensibility

Diaphragm maximum temperature

Zero drift due to change in process
temperature (zero)

Zero drift temperature for
Autocompensated version (SP) within
the temperature range 20°C-315°C
inclusive the drift temperature of the
housing

Standard Material in contact
with process medium

Thermocouple (model WE2)

Protection degree
(with 6-pole female connector)

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

0..500 to 0..15000psi

1.5 x FS above 500bar/7500psi

< 0.005 bar/°C 100 ≤ p < 500 bar

0.0022 %FS/°C p ≥ 500 bar

Diaphragm:

• 17-7PH corrugated diaphragm
with GTP+
Stem

• 17-4 PH

STD: type “J” (isolated junction)

Infinite

0..35 to 0..1000bar

2 x FS

Extensimetric

10...30Vdc

32mA

>1000 MOhm

20mA

4mA

“Autozero” function

See Manual

See diagram

~ 1ms

< 0.025% FSO

80% FSO

YES

0...+85°C

-30...+105°C

-40...+125°C

< 0.02% FSO/°C

315°C / 600°F

< 0.04 bar/°C

IP65

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

MECHANICAL DIMENSIONS

WE0

D1

D2

D3

D4

D5

A

B

C

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” ]

Ch

[Hex]

16

[ 5/8” ]

WE1 WE3

D1

M18x1.5

[ ø0.394” -0.002 ]

[ ø0.63” -0.003 ]

[ ø0.63” -0.016 ]

A

[ 0.24” -0.01 ]

B

[ 0.58” -0.016 ]

C

ø10 -0.05

ø16 -0.08

ø16 -0.4

ø18

[ ø0.71” ]

6 -0.26

14.8 -0.4

19

[ 0.75” ]

19

[ 3/4” ]

D2

D3

D4

D5

Ch

[Hex]

Exposed

capillary
D1 1/2-20UNF
D2 .307/.305”

[7.80/7.75mm]
D3 .414/.412”
[10.52/10.46mm]
A .125/.120”
[3.18/3.05mm]
B .318/.312”
[8.08/7.92mm]
C .81”
[20.6mm]

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)