Gefran SERIE KD Specification 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