Gefran ME SERIES Data Sheet

MELT PRESSURE TRANSMITTERS

ME SERIES PERFORMANCE LEVEL ‘c’

Output 4...20mA

The ME 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 400°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 of the strain-gauge technology.

MAIN FEATURES

• Pressure ranges from:
0-17 to 0-2000 bar / 0-250 to 0-30000 psi

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

•Fluid-filled system for temperature stability

•Mercury filling volume:
ME0 (30mm3); ME1, ME2, ME3 (40mm3)

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

• Autozero function on board / external option

• Standard diaphragm is 15-5 PH stainless steel with
GTP+ coating

• 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.

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 400°C / 750°F

Zero drift due to change in process
temperature (zero)

Standard material in contact
with process medium

Thermocouple (model ME2) 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...2000 bar)
M <±0.5%FSO (35...2000 bar)

0..17 to 0..2000bar

0..250 to 0..30000psi

2 x FS

1.5 x FS above 1000bar/15000psi

23mA

(40mA with relay optional)

4mA

YES

0...+85°C

-30...+85°C

< 0.02% FSO/°C

< 0.02 bar/°C

Diaphragm:

• 15-5PH with GTP+ coating

• 17-7 PH corrugated diaphragm
with GTP+ coating for ranges
<100bar (1500psi)
Stem: • 17-4 PH

IP65

MECHANICAL DIMENSIONS

ME0

D1

D2

D3

D4

D5

A

B

C

Ch

[Hex]

D1

D2

ME2

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 ]

ME1

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” ]

ME3

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)