Gefran MX SERIES Data Sheet

MELT PRESSURE TRANSMITTERS FOR APPLICATIONS IN

POTENTIALLY EXPLOSIVE ATMOSPHERES

MX SERIES 4-20mA Output

The MX 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.

ATEX

The phisical measure is transformed in a electrical mea­sure by means the strain-gauge technology.

MAIN FEATURES

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

• Extensimetric measurement principle with Wheatstone
bridge

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

• Calibration signal 80% FSO internally generated

• Completely interchangeable with all existing products

• Protection level: IP65 (6-pin connector)

• Standard threading 1/2-20UNF, M18x1.5, other versions on
request

• Stainless steel diaphragm 15-5 PH with GTP+ coating

• For ranges below 100 bar-1500 psi: 17-7 PH corrugated
stainless steel diaphragm with GTP+ coating

• Other diaphragm types available on request

MX0 The rigid rod configuration provides fast and easy
installation.
MX1 The flexible rod configuration is suitable for
applications demanding greater thermal isolation
and where installation would otherwise be difficult.
MX2 This configuration lets you measure process
pressure and temperature at the same point with a
single installation.
MX3 The configuration with exposed tip is ideal for
applications in limited space.

Main intrinsic safety characteristics

Transmitter designed and produced in compliance with Directive
ATEX 2014/34/EU and according to European standards:
for the second group (II-surfaces), category1,explosive atmosphere
with presence of gases, fumes or mists (G) protection mode Ex ia IIC
T5, T4 room temperature -20°C/+55°C/+60°C/+70°C

Maximum voltage 30 V
Maximum current 100 mA
Maximum power 0,75 W
Equivalent inductance (*) 0,23 mH
Equivalent capacity (*) 26 nF

(*) includes inductance levels and capacity of a cable:
(typical L 1microH/m and typical C 100pF/m)
with maximum length 15m.

TECHNICAL SPECIFICATIONS

Rated precision, including effects
of Linearity, Repeatability and
Hysteresis

Resolution
Pressure ranges

Maximum applicable pressure

Principle of measurement
Power supply
Maximum input
Isolation resistance (at 50 Vdc)

Signal at rated pressure (FSO)

Zero balancing
Calibration: Rated pressure

Room pressure
Maximum load
Response time (10 at 90% FSO)
Output noise (RMS 10-400Hz)
Calibration signal
Protection against overvoltages and

power supply polarity reverse
Temperature range of Strain Gauge

Housing
Thermal drift in compensated range:

Zero/Calibrat/Sensitivity
Maximum temperature of diaphragm
Influence due to fluid temperature

change (zero)
Standard material in contact

with process medium

Thermocouple (model MX2)
Protection level (with 6-pin female

connector installed)
Electrical connections

FSO = Full Scale Output (Signal at rated pressure)

Power at zener barrier or active barrier. For version MX2, the thermocou­ple must be connected to EX-i circuits with devices assigned to galvanic
separation and with protection mode [EX ia] IIC.

EC-Type Examination Certificate number:

CESI 02 ATEX 107

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 beyond 1000bar/15000psi

Strain gauge

12...30Vdc
30mA

>1000 MOhm

20mA

4mA

5% FSO

min. 10bar (150psi)

see diagram (page 3)

~ 4ms

< 0.05% FSO

80% FSO

YES

-20...+70°C

-4...+158°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

MX0 MX2

D1

1/2 - 20UNF

ø7.8 -0.05

D2

[ ø0.31” -0.002 ]

ø10.5 -0.025

D3

[ ø0.41” -0.001 ]

D4

D5

A

B

C

Ch

[Hex]

MX1 MX3

D1

D2

D3

D4

D5

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 ]

ø16 -0.08

[ ø0.63” -0.003 ]

ø16 -0.4

[ ø0.63” -0.016 ]

ø18

[ ø0.71” ]

A

B

C

Ch

[Hex]

6 -0.26

[ 0.24” -0.01 ]

14.8 -0.4

[ 0.58” -0.016 ]

19

[ 0.75” ]

19

[ 3/4” ]

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)



ELECTRICAL CHARACTERISTICS AND TEMPERATURE CLASSES

MODEL (*) LEVEL (*) LEVEL TEMPERATURE ROOM
L2 L1 CLASSES TEMPERATURE

MX0 > 165mm > 125mm T4 -20...+60°C

MX1 > 665mm > 625mm T5 -20...+55°C

T4 -20...+70°C

MX2 > 665mm > 625mm T5 -20...+55°C

T4 -20...+70°C

MX3 > 665mm > 625mm T5 -20...+55°C

T4 -20...+70°C

(*) with the level (L) in fig. 1, the table sets the
minimum distance that the electrical circuit has
to maintain from the block at high temperature.

thermal isolating material with adequate
thickness for the process temperature

pressure transmitter housing block

fluid at temperature (400°C)

ELECTRICAL CONNECTIONS Output in current (4...20mA 2 wires)

6-pin 8-pin

L1

L2

Power supply
(12...30Vdc)

Signal
(4...20mA)

Calibrtation shunt

+

n.c.

n.c.

A

C

-

B

D

E - F

n.c.

The cable sheathing is con-

nected to the transducer body

B

A

D

C

E - F

G - H

6 pin connector

VPT07RA10-6PT2

(PT02A-10-6P)

LOAD DIAGRAM (current output) SETTINGS

AREA OF
POSSIBLE
USE

8 pin connector

PC02E-12-8P Bendix

LOAD RESISTANCE RL

The diagram shows the best ratio of load to power supply for
transmitters with 4…20mA output. For correct function, use a
combination of load resistance and voltage that stays in the
shaded zone.

Accessories

Fastening bracket SF18
Protection plug for 1/2-20 UNF SC12
Protection plug for M18x1.5 SC18
Drill kit for 1/2 -20 UNF KF12

VOLTAGE

The signal setting to room pressure (ZERO) and the setting to
rated pressure (SPAN) can be made with the appropriate
trimmers, accessed inside the transmitter after removing the
two fastening screws.

The SPAN setting is made during production and must not
be changed.

Extension cables

6-pin connector with 3mt Atex cable PCAV221
6-pin connector with 4mt Atex cable PCAV104
6-pin connector with 5mt Atex cable PCAV105

6-pin connector with 10mt Atex cable PCAV106
Drill kit for M18 x 1.5 KF18
Cleaning kit for 1/2-20 UNF CT12
Cleaning kit for M18x1.5 CT18

Thermocouples for model MX2

Type “J” (for rigid rod 153mm - 6”) TTER 718

ORDER CODE

M

OUTPUT SIGNAL

4...20mA

CONFIGURATION

Rigid rod
Rigid rod + flexible
With thermocouple

Exposed tip

CONNECTOR

Standard

6 pin 6
8 pin 8

PRECISION CLASS

(ranges ≥100 bar/1500 psi)

MEASUREMENT RANGE

bar

3550B35U

70 B07D
100 B01C

200
350 B35D
500 B05C

700

1000 B01M

1400 B14C
2000 B02M

0.25% FSO

0.5% FSO M

500

B05D

B02C

B07C

750
1000 P01M
1500 P15C

3000 P03M
5000 P05M
7500 P75C

10000 P10M

15000 P15M

20000 P20M
30000 P30M

psi

Notes:
the models MX0/MX1/MX3 are available in a special version
XM3GD realized to work in the presence of gases (zone 2)
and powders (zone 22).

Marking:

Examples:

MX1-6-M-B05C-1-4-D-5-(XM3GD)

Example

MX1-6-M-B07C-1-4-D-4-000

Melt pressure transducer with flexible rod, 4…20mA output, 6-pin connector, fi-20 UNF

threading, pressure range 700 bar, precision class 0.5%, 153 mm (6”) rigid rod, 457 mm
(18”) flexible rod, temperature class T4

Sensors are manufactured in compliance with:

X

0
1

2
3

H

P05C
P75D

II 3G Ex nA IIC T4,T5,Gc
II 3D Ex tc IIIC T135°C,T100°C Dc,IP65

000

000= Special executions of the
standard version or of custom
versions may be requested.

4

T4
T55

NOTES: Series MX0 available
only in T4 class

FLEXIBLE ROD LENGTH

(mm / inches)

Standard (MX0)

0

none

Standard (MX1, MX2)

D

457mm
610mmE
760mmF

Standard (MX3)

L

711mm

Available on request

A

76mm

B

152mm

C

300mm

G

914mm

H

1067mm

I

1220mm

J

1372mm

K

1520mm

RIGID ROD LENGTH

(mm / inches)

Standard (MX0, MX1, MX2)

4

153mm
318mm5

Standard (MX3)

none

0

Available on request

1

38mm

2

50mm

3

76mm

6

350mm
400mm

7
8

456mm

1) use rod MX1 and MX2 in combination
with sheathings or rigid rods so that

total length L is ≥ 630mm

THREADING

Standard

1

1/2 - 20 UNF
M18 x 1.54

Available on request

M10 x 1

2

(ranges ≥200bar / 3000psi)

3

M14 x 1.5

18”
24”
30”

28”

3” 1)
6” 1)
12” 1)
36”
42”
48”
54”
60”

6”

12.5”

1.5” 1)
2” 1)
3” 1)
14”
16”
18”

- EMC compatibility directive

- ATEX

Product designed and available in compliance with Directive 2011/65/EU (RoHS II) only for large-scale stationary installa­tion or industrial tools, or for B-to-B laboratory equipments for R&D purposes.

Electrical installation requirements and Conformity certificate are available on our web site: www.gefran.com

GEFRAN spa reserves the right to make aesthetic or functional changes at any time and without notice.

DTS_MX_07-2017_ENG