Gefran MN SERIES Specification Sheet
MELT PRESSURE TRANSMITTERS
MN SERIES Voltage output
The MN 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 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:
MN0 (30mm3); MN1, MN2, MN3 (40mm3)
• 1/2-20UNF, M18x1.5 standard threads; other types available on request
• Other diaphragms available on request
• Autozero function on board / external option
• Drift Autocompensation function (SP version)
• 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.
AUTOCOMPENSATES INFLUENCE OF MELT
TEMPERATURE
Thanks to internal self-compensation, the MSP 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-400°C inclusive
the drift temperature of the housing
Standard material in contact
with process medium
Thermocouple (model MN2)
Protection degree (6-pole female connect)
H <±0.25%FSO (100...2000 bar)
M <±0.5%FSO (35...2000 bar)
0..500 to 0..30000psi
1.5 x FS above 1000bar/15000psi
5Vdc (M, H) - 10Vdc (N, L)
5,1Vdc (B) - 10,1Vdc (C)
< 0.003 bar/°C 100 ≤ p < 500 bar
0.0014 %FS/°C p ≥ 500 bar
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)
Infinite
0..35 to 0..2000bar
2 x FS
Extensimetric
15...30Vdc N, C
10...30Vdc B, M
-15...+15Vdc H, L
25mA
>1000 MOhm
0Vdc (M, N, H, L)
0.1Vdc (B, C)
“Autozero” function
See Manual
1mA
~ 1ms
< 0.025% FSO
80% FSO
YES
0...+85°C
-30...+105°C
-40...+125°C
< 0.02% FSO/°C
400°C / 750°F
0.02 bar/°C
IP65
FSO = Full scale output: (1) BFSL method (Best Fit Straight Line): includes
combined effects of Non-Linearity, Hysteresis and Repeatability.
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