Gefran MX SERIES Specification 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
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