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 tempera-

ture 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 tra-

smission of the pressure.

The fluid-filled system assures the temperature stability.

The physical measure is transformed in a electrical mea-

sure by means of strain-gauge technology.

TECHNICAL SPECIFICATIONS

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 elimina-

ted by using the Autozero function.

This function is activated by closing a magnetic contact loca-

ted on the transmitter housing.

The procedure is permitted only with pressure at zero.

This function can be activited via HART as well.

Accuracy (1)

H <±0.25%FSO (100...1000 bar)

M <±0.5%FSO (17...1000 bar)

Resolution 16 bit

Measurement range

0..17 to 0..1000bar

0..250 to 0..15000psi

Rangeability 3:1

Maximum overpressure (without

degrading performances)

2 x FS

1.5 x FS above 700bar/10000psi

Measurement principle Extensimetric

Power supply 13...30Vdc

Maximum current absorption

23mA

(40mA with relay optional)

Output signal Full Scale (FSO) 20mA

Zero balance (tollerance ± 0.25%

FSO)

4mA

Calibration signal 80% FSO

Power supply polarity reverse

protection

YES

Compensated temperature range

housing

0...+85°C

Operating temperature range

housing

-30...+85°C

Storage temperature range housing -40...+125°C

Thermal drift in compensated range:

Zero / Calibration / Sensibility

< 0.02% FSO/°C

Diaphragm maximum temperature 538°C / 1000°F

Zero drift due to change in process

temperature (zero)

< 3.5 bar/100°C / < 28 psi/100°F

Thermocouple (model HKE2) STD: type “J” (isolated junction)

Protection degree

(with 6-pole female connector)

IP65

FSO = Full scale output :

(1) BFSL method (Best Fit Straight Line): includes combined effects of Non-Linearity,

Hysteresis and Repeatability

MECHANICAL DIMENSIONS

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)

HKE1

HKE0

1/2 - 20UNF

[Hex]

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” ]

[ 5/8” ]

ø10 -0.05

[ ø0.394” -0.002 ]

M18x1.5

[Hex]

ø16 -0.08

[ ø0.63” -0.003 ]

ø18

[ ø0.71” ]

6 -0.26

[ 0.24” -0.01 ]

14.8 -0.4

[ 0.58” -0.016 ]

[ 0.75” ]

[ 3/4” ]

ø16 -0.4

[ ø0.63” -0.016 ]