Gefran SERIE KE Specification Sheet

NaK FILLED MELT PRESSURE
TRANSMITTERS
SERIE KE 4...20mA output

The KE 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

• 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: KE0 series (30mm³)

[0.00183 in³], KE1, KE2, KE3 (40mm³) [0.00244 in³]

• 1/2-20UNF, M18x1.5 standard threads; other types available
on request

• Autozero function on board / external option

• Stem drift Autocompensation function (SP version)

• 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 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.

AUTO-COMPENSATED INFLUENCE OF MELT
TEMPERATURE

Thanks to internal self-compensation, the KSP 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).
The drift values declared in the version with Autocompensation
are valid for media temperatures up to 500°C.

TECHNICAL SPECIFICATIONS

Accuracy (1)

Resolution

Measurement range

Maximum overpressure
(without degrading performances)

Measurement principle Extensimetric

Power supply

Maximum current absorption

Insulation resistance

(at 50Vdc)

Output signal Full Scale FSO 20mA

Zero balance
(tolerance ± 0.25% FSO)

Zero signals adjustment
(tolerance ± 0.25% FSO)

Span adjustment within ± 5% FSO

Maximum allowed load See chart

Electronic response time

(10...90% FSO)

Output noise (RMS 10-400Hz) < 0.025% FSO

Calibration signal

Output short circuit and reverse
polarity protection

Compensated temperature range 0...+85°C

Operating temperature range

Storage temperature range

Thermal drift in compesated range:
Zero / Calibration / Sensibility

Diaphragm maximum temperature

Zero drift (zero)

Zero drift temperature for
Autocompensated version (SP)
within the temperature range
20°C-500°C inclusive the drift tem­perature of the housing

Thermocouple (model KE2)

Protection degree
(with 6-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)

Infinite

0..35 a 0..1000bar

0..500 a 0..15000psi

2 x FSO

1.5 x FSO over 700bar/10000psi

10..30Vdc

32mA

>1000 MOhm

4mA

“Autozero” function

See Melt Manual

~ 1ms

80% FSO

YES

-30...+105°C

-40...+125°C

< 0.02% FSO/°C

538°C

1000°F

< 3,5bar/100°C /

< 28 psi/100°F

< 0.005 bar/°C 100 ≤ p < 500 bar

0.0022 %FS/°C p ≥ 500 bar

STD : tipo “J”

(isolated junction)

IP65