Gefran SERIE KD Data Sheet
NaK FILLED MELT PRESSURE
TRANSMITTERS
SERIE KD DP404 CAN OPEN digital output
The KD Series are for use in high temperature applications where the process temperatures may reach 538°C
(1000°F) such as high temperature engineered polymers.
The K Series utilizes standard melt pressure principles
and construction, but uses a near incompressible NAK
(Sodium Potassium) for pressure transmission.
The K Series strain sensing technology is bonded foil
strain gage.
MAIN FEATURES
Electrical
• Digital output signal with DP404 CAN OPEN
communication protocol
• Transmission frequency (Baud rate):
10 Kbaud to 1Mbaud (default 500 Kbaud)
• Software selection of Baud rate and ID nodes
• Operation with 1 or 2 settable alarm limits
• “Autozero” for temperature compensation
• 80% FSO calibration signal
Mechanical
• Pressure ranges: 0-35 to 0-1000 bar / 0-500 to 0-15000 psi
• Accuracy: < ± 0.25% FSO (H); < ±0.5% FSO (M)
• Hydraulic transmission system to guarantee temperature
stability (NaK). Liquid conforming to RoHS Directive.
NaK is defined as a safe substance (GRAS).
• Quantity of NaK contained per model:
KD0 series (30mm³) [0.00183 in³], KD1,KD2,KD3
(40mm³) [0.00244 in³]
• Standard threading: 1/2-20 UNF, M18x1.5; other versions
on request.
• 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 100 bar-1500 psi up to 400°C (750°F)
• Stem material: 17-4 PH
GTP+ (advanced protection) Coating with high resistance against
corrosion, abrasion and high temperature.
TECHNICAL SPECIFICATIONS
Accuracy (1)
Sampling 16 bit
Measurement range
Maximum overpressure
(without degrading performances)
Measurement principle Extensimetric
Power supply 12...40Vdc
Maximum current absorption 20mA
Insulation resistance
(at 50Vdc)
Output signal Full Scale FSO Depends on FSO
Zero balance 0
Calibration of ambient
pressure
Signal protocol
Response time
(10 at 90% FSO)
Electronic response time
(10 at 90% FSO)
Calibration signal 80% FSO
Protection against overvoltage
and reverse polarity of power
supply
Compensated temperature
range
Operating temperature range -30…+105°C
Thermal drift in compesated
range:
Zero / Calibration / Sensibility
Diaphragm maximum
temperature
Zero drift (zero)
Thermocouple (model KD2) STD : type “J” (isolated junction)
Protection degree
(with 5-pole female connector)
FSO = Full Scale Output
(1) BFSL method (Best Fit Straight Line): includes combined effects of NonLinearity, Hysteresis and Repeatability.
H <±0.25%FSO (100...1000 bar)
M <±0.5%FSO (35...1000 bar)
0..35 to 0..1000bar
0..500 to 0..15000ps
2 x FSO
>1000 MOhm
Insertion of an offset
DP404 CAN OPEN, with baudra-
te selectable from 10K to 1Mbaud
(default 500Kbaud)
20 ms
2 ms
YES
0…+85°C
<0.02 %FSO/°C
538°C (1000°F)
< 3,5bar/100°C
(< 28 psi/100°F )
IP65
MECHANICAL DIMENSIONS
KD0
D1
D2
D3
D4
D5
A
B
C
KD2
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” ]
KD1
Ch
[Hex]
D1
D2
D3
D4
D5
A
B
C
Ch
[Hex]
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” ]
6 -0.26
[ 0.24” -0.01 ]
14.8 -0.4
[ 0.58” -0.016 ]
19
[ 0.75” ]
19
[ 3/4” ]
KD3
Exposed capillary
D1 1/2-20UNF
.307/.305”
D2
[7.80/7.75mm]
.414/.412”
D3
[10.52/10.46mm]
.125/.120”
A
[3.18/3.05mm]
.318/.312”
B
[8.08/7.92mm]
C
.81”
[20.6mm]
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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