SMART HART NaK FILLED MELT PRESSURE TRANSMITTERS

HKE SERIES - CURRENT OUTPUT PL d & SIL2 VERSION

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 measu-

re by means of thick film strain-gauge technology.

The SIL2 and PL d approvals make the product suitable for

use in the Functional Safety applications, particularly in the

process plants for the production of polymers, where it is

an essential requirement.

TECHNICAL SPECIFICATIONS

MAIN FEATURES

• Pressure ranges from: 0-17 to 0-1000 bar / 0-250 to

0-15000 psi

• Accuracy: < ±0.25% FS (H); < ±0.5% FS (M)

• Hydraulic transmission system for pressure signal

guarantees stability at working temperature (NaK).

• SIL2 and PL d approvals for Functional Safety

• 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%FS (100...1000 bar)

M <±0.5%FS (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 (FS) 20mA

Zero balance (tollerance ± 0.25%

FS)

4mA

Calibration signal 80% FS

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% FS/°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

CON300)

IP66

SIL2 certification

PL d certification

IEC/EN 62061 / IEC 61508

EN ISO 13849

FS = Full scale output :

(1) BFSL method (Best Fit Straight Line): includes combined effects of

Non-Linearity, Hysteresis and Repeatability (according to IEC 62828-2)