Gefran HKE SERIES Data Sheet
SMART HART NaK FILLED MELT PRESSURE TRANSMITTERS
HKE SERIES - CURRENT OUTPUT
AND PERFORMANCE LEVEL ‘c’ 4...20mA Output
The HKE 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 538°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.
MAIN FEATURES
• Pressure ranges from: 0-35 to 0-1000 bar / 0-500 to
0-15000 psi
• Accuracy: < ±0.25% FSO (H); < ±0.5% FSO (M)
• Hydraulic transmission system for pressure signal
guarantees stability at working temperature (NaK).
• Liquid conforming to RoHS Directive. NaK is defined as a
safe substance (GRAS)
• Quantity of NaK contained per model: HKE0 series
(30mm³) [0.00183 in³], HKE1, HKE2, HKE3 (40mm³)
[0.00244 in³]
• 1/2-20UNF, M18x1.5 standard threads; other types
available on request
• Autozero function on board / external option
• Inconel 718 diaphragm with GTP+ coating for temperatures
up to 538°C (1000°F)
• 15-5 PH diaphragm with GTP+ coating for temperatures up
to 400°C (750°F)
• Hastelloy C276 diaphragm for temperatures up to 300°C
(570°F)
• 17-7 PH corrugated diaphragm with GTP+ coating for
ranges below 100bar-1500psi (up to 400°C/750°F)
• Stem material: 17-4 PH
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.
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 80% FSO
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 538°C / 1000°F
Zero drift due to change in process
temperature (zero)
Thermocouple (model HKE2) 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...1000 bar)
M <±0.5%FSO (17...1000 bar)
0..17 to 0..1000bar
0..250 to 0..15000psi
2 x FS
1.5 x FS above 700bar/10000psi
23mA
(40mA with relay optional)
4mA
YES
0...+85°C
-30...+85°C
< 0.02% FSO/°C
< 3.5 bar/100°C / < 28 psi/100°F
IP65
MECHANICAL DIMENSIONS
HKE0
HKE1
D1
D2
D3
D4
D5
A
B
C
Ch
[Hex]
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” ]
16
[ 5/8” ]
D1
D2
D3
D4
D5
A
B
C
Ch
[Hex]
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” ]
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)
MECHANICAL DIMENSIONS
HKE2
HKE3
D1
D2
D3
D4
D5
A
B
C
Ch
[Hex]
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” ]
16
[ 5/8” ]
D1
D2
D3
D4
D5
A
B
C
Ch
[Hex]
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” ]
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)
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