Gefran M3 SERIES Data Sheet

MELT PRESSURE TRANSDUCERS

M3 SERIES mV / V output

The M3 series of Gefran, are pressure transducers 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 the strain-gauge technology.

MAIN FEATURES

• Pressure ranges from:
0-35 to 0-2000 bar / 0-500 to 0-30000 psi

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

• Fluid-filled system for temperature stability

• Mercury filling volume:
M30 (30mm3), M31-M32-M33 (40mm3)

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

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

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

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

TECHNICAL SPECIFICATIONS

Accuracy (1)

Resolution
Measurement range

Maximum overpressure

Measurement principle
Supply voltage
Strain gage bridge resistance

Isolation resistance (at 50Vdc)

Full Scale Output (FSO)
(toll. ± 0.5 FSO)

Zero balance

Calibration signal

Compensated temperature range

Maximum temperature range

Thermal drift in compensated range
Zero/Calibr./Sens.

Diaphragm maximum temperature

Zero drift due to change in process
temperature

Standard material in contact
with process medium

Thermocouple (model M32)
Protection degree (with 6-pin mating

connector)

Electrical connections

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

H <±0.25%FSO (100...2000 bar)
M <±0.5%FSO (35...2000 bar)

Infinite

0..35 to 0..2000bar

0..500 to 0..30000psi
2 x FS

1.5 x FS above1000bar/15000psi

Strain gage Wheatstone bridge

6..12Vdc (10Vdc typical)
350 Ohm

(550 Ohm below 100bar - 1500psi)

>1000 MOhm

2.5 mV/V (option 2)

3.33 mV/V (option 3)
±0.5% FSO

80% FSO

0...+100°C

32...212°F

-30...+120°C

-22...250°F

< 0.02% FSO/°C
< 0.01% FSO/°F

400°C

750°F

0.02 bar/°C

15 psi/100°F

Diaphragm:

• 15-5 PH with GTP+ coating

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

• 17-4 PH

STD : type “J” (isolated junction)

IP65

6-pin Conn. VPT07RA10-6PT

(PT02A-10-6P)

8-pin Conn. PC02E-12-8P

MECHANICAL DIMENSIONS

M30

D1

D2

D3

D4

D5

A

B

C

M32

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” ]

M31

Ch

[Hex]

D1

D2

D3

D4

D5

A

B

C

Ch

[Hex]

16

[ 5/8” ]

M18x1.5

ø10 -0.05

[ ø0.394” -0.002 ]

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” ]

M33

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” (153mm - 6”)

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