Gefran HME SERIES Specification Sheet
SMART HART MERCURY FILLED MELT PRESSURE
TRANSMITTERS - HME SERIES
CURRENT OUTPUT AND PERFORMANCE LEVEL ‘c’
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:
HME0 (30mm³); HME1, HME2, HME3 (40mm³)
• 1/2-20UNF, M18x1.5 standard threads; other types available 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 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.
This function can be activited via HART as well.
4...20mA Output
The HME series of Gefran are pressure transmitters with
HART communication protocol 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 physical measure is transformed in a electrical measure by means of strain-gauge technology.
TECHNICAL SPECIFICATIONS
Accuracy (1)
Resolution 16 bit
Measurement range
Rangeability 3:1
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)
Calibration signal
Power supply polarity reverse
protection
Compensated temperature range
housing
Operating temperature range
housing
Storage temperature range housing -40...+125°C
Thermal drift in compensated 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 HME2) 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 (17...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
80% FSO
YES
0...+85°C
-30...+85°C
< 0.02% FSO/°C
< 0.02 bar/°C
Diaphragm:
• 15-5 PH with GTP+ coating
• 17-7 PH corrugated diaphragm with
GTP+ coating for ranges <100bar
(1500psi)
Stem: • 17-4 PH
IP65
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