gefran HMF Series User manual
SMART HART MELT PRESSURE TRANSMITTERS
HMF, HWF SERIES
INSTRUCTION MANUAL
cod. 80636B Edit. 05/2022 - ENG
ATTENTION!
This manual is an integral part of the product,
and must always be available to operators.
This manual must always accompany the
product, including if it is transferred to another user.
Installation and/or maintenance workers MUST
read this manual and scrupulously follow all of the
instructions in it and in its attachments.
GEFRAN will not be liable for damage to
persons and/or property, or to the product itself, if the
following terms and conditions are disregarded.
The customer must respect trade secrets.
Therefore, this manual and its attachments may
not be tampered with, changed, reproduced, or trans-
ferred to third parties without GEFRAN’s authorization.
This document is the property of GEFRAN and may not be reproduced or transferred to third parties without authorization.
280636B_MAN_HMF - HWF_05-2022_ENG
3
80636B_MAN_HMF - HWF_05-2022_ENG
INDEX
Gefran Smart HART series READY-TO-USE GUIDE���������������������������������������������������������������������������������������������������������4
READY-TO-USE Using magnetic pen / pin CAL feature .......................................................................................................4
READY-TO-USE Using HART Communicator ......................................................................................................................4
Menu Tree H Pres Transmitter...........................................................................................................................................5
1� General Information �������������������������������������������������������������������������������������������������������������������������������������������������������������6
2� Acronyms ������������������������������������������������������������������������������������������������������������������������������������������������������������������������������6
3� Name coding�������������������������������������������������������������������������������������������������������������������������������������������������������������������������7
4. Sensor Technical Specications�����������������������������������������������������������������������������������������������������������������������������������������8
4.1. HWF – Technical data..................................................................................................................................................8
4.2. HMF – Technical data ...................................................................................................................................................9
5� Mechanical Dimensions�����������������������������������������������������������������������������������������������������������������������������������������������������10
6� Installation and positioning on the machine �������������������������������������������������������������������������������������������������������������������10
6.1. Installation seat...........................................................................................................................................................10
6.2. Drilling tool kit..............................................................................................................................................................11
6.3. Wiring and calibration .................................................................................................................................................13
7� Electrical Connections�������������������������������������������������������������������������������������������������������������������������������������������������������14
8� Command modes ���������������������������������������������������������������������������������������������������������������������������������������������������������������15
8.1. Using Magnetic pen and Pin CAL...............................................................................................................................15
8.2. Using HART communication.......................................................................................................................................17
9� Maintenance������������������������������������������������������������������������������������������������������������������������������������������������������������������������23
9.1. Transport, storage and disposal..................................................................................................................................23
10. Functional Safety notes (for SIL 2 / PL d certied versions only) �������������������������������������������������������������������������������24
10.1. NE21 and NE43 compatibility specications ............................................................................................................28
11. SAFETY NOTES FOR APPLICATIONS IN POTENTIALLY EXPLOSIVE ATMOSPHERES (for FM certied versions
only)�����������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������29
11.1. Mounting Instructions For Installations In Dangerous Zones ....................................................................................30
12� ANNEXES ������������������������������������������������������������������������������������������������������������������������������������������������������������������������31
480636B_MAN_HMF - HWF_05-2022_ENG
Gefran Smart HART series READY-TO-USE GUIDE
This Ready-to-Use guide can be used by expert instrumentation operators to configure the transmitter using HART
Communication or Autozero/Calibration features through magnetic pen or contacts on output connector.
For more full information please refer to the complete manual before operating.
The Ready-to-Use procedure with HART is intended for users already familiar with HART Communicator and loop powered
equipment.
READY-TO-USE Using magnetic pen / pin CAL feature
Bring the system to the working temperature with the transmitter installed and connected to the measurement instrument
without any pressure applied. For a 6 or 8 pin connector version, Pin A is Sig+/Exc+ and pin B is Sig-/Exc-.
For conduit output configurations, please look at Electrical Connections chapter.
Assure proper loop feeding voltage is applied to transmitter.
The measurement chain connected to the transmitter is calibrated as follows:
1) Reset the offset on the instrument by eliminating the thermal drift with the Autozero function.
With the sensor installed and the extruder at working temperature, wait until the temperature itself is stable, with a pos-
sible variation of ±1°C. Consequently Autozero can be activated.
This allows to compensate all the signal drifts caused by tightening and temperature. Additional Autozero activations
could be run once the temperature stability is reached, with ±1°C of possible variation.
2) Calibrate the instrument activating the CAL function.
The transducer brings its output to the calibration value shown on the transducer data plate (80% of full scale default,
if changed with HART command it could be different). With the external Autozero function the calibration procedure is
not feasible.
3) If the instrument does not exactly indicate zero, repeat points 1) and 2).
READY-TO-USE Using HART Communicator
Bring the system to the working temperature with the transmitter installed and connected to the measurement instrument
without any pressure applied.
1) ConnectCommunicatortotheloop.Incaseit’snotsureonhowtodothis,pleasereferto“ConnectingtheHART
Handheld Communicator” (Fig. 8.1).
2) Switch on HART Communicator. For reference please refer to HART Command tree on the following page.
3) From the main menu:
a. Enter Tag (Fast Key 1, 3, 1)
b. Set Pressure Units (Fast Key 1, 3, 3), if needed
c. Set URV (Fast Key 1, 3, 4) if output turndown (rescaling), is needed
d. Perform Autozero (Fast Key 1, 2, 6, 3, 1)
4) Check loop output is zero (4mA).
5) Remove HART Communicator from loop.
5
80636B_MAN_HMF - HWF_05-2022_ENG
1 Range values
2 Apply values
1 Autozero
2 Reset Autozero
3 Device variable
trim
4 Sensor Trim
points
1 Pressure Lower trim
2 Pressure Upper trim
3 Pressure Trim support
4 Pressure Trim unit
5 Pressure Min lower trim
6 Pressure Max lower trim
7 Pressure Min upper trim
8 Pressure Max upper trim
9 Pressure Min trim diff
1 Burst Mode
2 Burst Command
3 Update Period
4 Max Update Period
5 Burst Msg Trigger
Mode
6 Burst Trigger Class
7 Burst Trigger Units
8 Burst Trigger
Level
1 Pres LSL
2 Pres USL
3 Pres min span
4 PV URV
5 PV LRV
Hi
Lo
1 Pressure PDQ
2 Pressure LSL
3 Pressure USL
4 Pressure Min Span
5 Pressure Damp
1 Pressure Lower trim
2 Pressure Upper trim
3 Pressure Trim support
4 Pressure Trim unit
5 Pressure Min lower trim
6 Pressure Max lower trim
7 Pressure Min upper trim
8 Pressure Max upper trim
9 Pressure Min trim diff
1 Pressure PDQ
2 Pressure LSL
3 Pressure USL
4 Pressure Min Span
5 Pressure Damp
1 Pressure PDQ
2 Pressure LSL
3 Pressure USL
4 Pressure Min Span
5 Pressure Damp
1 Re-range
2 D/A Trim
3 Sensor trim
4 Device variable
trim reset
5 Rcal
1 Burst Message 1
2 Burst Message 2
3 Burst Message 3
1 Sensor Status 1
2 Sensor Status 2
3 Device
Standardized Status
1 Range values
2 Apply values
1 Autozero
2 Reset Autozero
3 Device variable
trim
4 Sensor Trim
points
1 Range values
2 Apply values
psi
bar
kg/Sqcm
MPa
KPa
…
1 Poll address
2 Num req
preambles
3 Num res
preambles
4 Burst
Configuration
1 PV Loop Current
2 PV Alarm Type
3 Loop Current
Mode
4 Loop Test
5 Calibration
1 Universal
revision
2 Field Device
revision
3 Software
revision
4 Hardware
revision
1 PV Pressure
2 PV % range
3 PV Loop Cur
4 SV Elect temp
5 TV Snout Temp
(*)
6 Sensor
Information
1 PV Pressure
2 PV % range
3 PV Loop Cur
4 SV Elect temp
5 TV Snout Temp
(*)
6 Sensor
Information
1 Alarms &
Warnings
2 Peak
Temperature
3 Peak Pressure
4 Peak Snout Temp
1 Re-range
2 D/A Trim
3 Sensor trim
4 Device variable
trim reset
5 Rcal
psi
bar
kg/Sqcm
MPa
KPa
…
1 Date
2 Descriptor
3 Message
1 Process
variables
2 Re-range
3 Pressure
Unit
4 PV Min
Span
5 PV Damp
1 Process
variables
2 Analog
Output
3 HART
Output
1 Tag
2 Long Tag
3 Date
4 Write
Protect
5 Descriptor
6 Message
7 Final
assembly
number
8 Serial
number
9 Device
Type
10 Model
11 Device Id
12 Cfg chng
count
13 Revision
#’s
1 Device Status
2 Self Test
3 Device Reset
4 Reset to Factory
Default
5 Loop Test
6 Calibration
1 PV Pressure
2 PV % range
3 PV Loop Cur
4 SV Elect temp
5 TV Snout Temp
(*)
6 Sensor
Information
1 Tag
2 Long Tag
3 PV Unit
4 Range values
5 Device
Information
6 PV Damp
1 Signal Condition
2 Output
Condition
3 Device
Information
1 Manufacturer
2 Model
3 Distributor
4 Write protect
5 Dev Id
6 Cfg chng count
7 Max dev vars
8 Serial number
9 Tag
10 Long Tag
11 Descriptor
12 Message
13 Date
14 Final assembly
number
15 Universal revision
16 Field device
revision
17 Software rev
18 Poll addr
19 Loop current mode
20 Num req preams
21 Num res preams
22 PV Unit
23 PV LSL
24 PV USL
25 PV Min Span
26 PV Damp
27 PV % range
28 PV transfer
function
29 PV LRV
30 PV URV
31 Pressure Lower
Trim
32 Pressure Upper
Trim
1 Device Setup
2 PV Pres
3 SV
Electronics
Temperature
4 TV Snout
Temp (*)
5 4V Peak
Electronics
Temperature
6 PV Loop
Current
7 PV LRV
8 PV URV
1 Process
variables
2 Diag/Service
3 Basic Setup
4 Detailed
Setup
5 Review
1 PV LRV
1 PV URV
1 Pres LSL
2 Pres USL
3 Pres min span
4 PV URV
5 PV LRV1 Pres LSL
2 Pres USL
3 Pres min span
4 PV URV
5 PV LRV
1 Pres LSL
2 Pres USL
3 Pres min span
4 PV URV
5 PV LRV
(*)Equalto0forHM,HW,HK(≠0forHI).
Menu Tree H Pres Transmitter
680636B_MAN_HMF - HWF_05-2022_ENG
1� General Information
This manual applies to the following products:
HMF and HWF series produced by Gefran spa, via sebina 74 – 25050 Provaglio di Iseo - BS - Italy.
1.1 General information
This manual must be kept near the equipment for easy reading and consultation.
It must be read, understood, and strictly follow in order to avoid and prevent accidents and/or malfunctions.
Gefran will not be liable for any injury to people and/or damage to property deriving from disregard of this
manual.
1.2 Copyright
Anyreproductionofthisdocument,evenpartialorforinternaluse,requiresGefran’sapproval.
1.3 Correct use
Gefran Melt pressure sensors with amplified current output with HART protocol are designed and built
to measure the pressure and temperature variable of melted plastic at different temperatures according
to the filling fluid used. The correct temperature range is:
• Up to 315°C for HW series (i.e. oil filling fluid)
• Up to 400°C for HM series (i.e. mercury filling fluid)
IfthesensorsareusedasasafetycomponentincompliancewiththeMachineryDirective,it’snecessary
toreadcarefullythe“SafetyManual”(chapter10).
In case the sensors are used for applications in potentially explosive atmospheres, please read carefully
(chapter 11).
Installation and maintenance must only be carried out by suitably skilled and qualified personnel.
2� Acronyms
The following acronyms are frequently used:
BFSL Best Fit Straight Line
DD Device Descriptor
EEPROM Electrically Erasable Programmable Read Only Memory
FS Full Scale Output
HART Highway Addressable Remote Transducer
LRV Lower Range Value
PT Pressure Transmitter
PV Primary Variable (Pressure)
RTD Resistance Temperature Detector (A very accurate temperature sensor)
SV Secondary Variable (Electronics Temperature)
TV Tertiary Variable (Snout Temperature)
URV Upper Range Value
Watchdog An internal timing control for the electronics
7
80636B_MAN_HMF - HWF_05-2022_ENG
3� Name coding
HWF Hart Oil Filled Melt Pressure Transducer
HWF P Hart Oil Filled Melt Pressure Transducer PL dCertied
HWF S Hart Oil Filled Melt Pressure Transducer SIL 2 Certifed
HMF Hart Mercury Filled Melt Pressure Transducer
HMF P HartMercuryFilledMeltPressureTransducerPLdCertied
HMF S Hart Mercury Filled Melt Pressure Transducer SIL 2 Certifed
Gefran Melt sensors are pressure/temperature transmitters designed for use in high temperature envi-
ronments. They read media pressure up to a temperature of 400°C, and resist such high temperatures thanks
to their special mechanical construction, in which the measurement element is isolated from the Melt.
The constructive principle is based on hydraulic transmission of pressure; mechanical strain is transferred by
means of a non-compressible transmission liquid.
The liquid used in these sensors may be mercury (i.e. HM series) or FDA-approved oil (i.e. HW series). Strain
gauge technology translates the physical quantity (pressure) into an electrical signal.
Five different designs are available: rigid rod, flexible sheathing, flexible plus thermocouple, exposed tip and
flange mount. Gefran Melt sensors satisfy all installation and field requirements.
The sensors can read an extremely wide range of pressures: from a version with minimum range of 0-17 bar
up to a version with a scale of 0-1000 bar.
All models in the catalog can be supplied in two different classes of accuracy: class M, with accuracy of 0.5%
FS, and class H, with accuracy of 0.25% FS. For all the other details and technical features please keep as
reference the product datasheets or Gefran website www.gefran.com.
PerformanceLevel‘d’orSIL2certifiedversionsareavailable.
Factory Mutual approved versions are available: rigid rod (0), flexible sheating (1), exposed tip (3), flange
mount (4). FM approved option 2 (flexible plus thermocouple) is not available. Please refer to datasheet for
explanation of configurations.
880636B_MAN_HMF - HWF_05-2022_ENG
Accuracy (1) H <±0.25%FS (100...1000 bar)
M <±0.5%FS (17...1000 bar)
Resolution 16 bit
Measurement range 0..35 to 0..1000bar
0..500 to 0..15000psi
Rangeability 3:1
Maximum overpressure (without degrading performances) 2 x FS
1.5 x FS above 500bar/7500psi
Measurement principle Extensimetric
Power supply 13...30Vdc
Maximum current absorption 23mA
Output signal Full Scale (FS) 20mA
Zero balance (tollerance ± 0.25% FS) 4mA
Calibration signal 80% FS
Power supply polarity reverse protection Yes
Compensed temperature range housing 0...+85°C
Operating temperature range housing -30...+85°C
Storage temperature range housing -40...+125°C
Thermal drift in compesated range: Zero / Calibration / Sensibility < 0.02% FS/°C
Diaphragm maximum temperature 315°C / 600°F
Zero drift due to change in process temperature (zero) < 0.04 bar/°C
Standard material in contact with process medium
Diaphragm:
• 17-7 PH corrugated diaphragm with GTP+ coating
Stem:
• 17-4 PH
Protection degree IP67 / NEMA 4X
Electomagnetic compatibility – Emissions
EN 61326-1
EN 61326-2-3
EN 61326-3-1
Electomagnetic compatibility – Immunity
EN 61326-1
EN 61326-2-3
EN 61326-3-1
FS = Full scale output
(1) BFSL method (Best Fit Straight Line): includes combined effects of Non-Linearity, Hysteresis and Repeatability.
4� Sensor Technical Specications
4�1� HWF – Technical data
9
80636B_MAN_HMF - HWF_05-2022_ENG
4�2� HMF – Technical data
Accuracy (1) H <±0.25%FS (100...2000 bar)
M <±0.5%FS (17...2000 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 1000bar/15000psi
Measurement principle Extensimetric
Power supply 13...30Vdc
Maximum current absorption 23mA
Output signal Full Scale (FS) 20mA
Zero balance (tollerance ± 0.25% FS) 4mA
Calibration signal 80% FS
Power supply polarity reverse protection Yes
Compensed temperature range housing 0...+85°C
Operating temperature range housing -30...+85°C
Storage temperature range housing -40...+125°C
Thermal drift in compesated range: Zero / Calibration / Sensibility < 0.02% FS/°C
Diaphragm maximum temperature 400°C / 750°F
Zero drift due to change in process temperature (zero) < 0.02 bar/°C
Standard material in contact with process medium
Diaphragm:
• 15-5 PH with GTP+ coating
• 17-7 PH corrugated diaphragm with GTP+ coating for ranges
<100 bar (1500psi)
Stem:
• 17-4 PH
Protection degree IP67 / NEMA 4X
Electomagnetic compatibility – Emissions
EN 61326-1
EN 61326-2-3
EN 61326-3-1
Electomagnetic compatibility – Immunity
EN 61326-1
EN 61326-2-3
EN 61326-3-1
FS = Full scale output
(1) BFSL method (Best Fit Straight Line): includes combined effects of Non-Linearity, Hysteresis and Repeatability.
Sense resistor Load Line
250 ohm minimum for HART communication
Sensors are manufactured in compliance with:
- EMC compatibility directive
- FM Approval Scheme (except version 2)
Electrical installation requirements and Conformity certificate are available on our web site: www.gefran.com
0
100
200
300
400
500
600
700
800
900
10 12 14 16 18 20 22 24 26 28 30
32
R (
Ω
)
Vcc (V)
WORKING AREA
10 80636B_MAN_HMF - HWF_05-2022_ENG
5� Mechanical Dimensions
The installation seat has to be realized:
D1 1/2-20UNF M18x1�5
D2 .313 ±.001” .398 ±.001”
[7.95 ±0.02mm] [10.10 ±0.02mm]
D3 .454 ±.004” .634 ±.004”
[11.53 ±0.1mm] [16.10 ±0.1mm]
D4 .515” [13mm] .790” [20mm]
minimum minimum
A.225” [5.72mm] .240” [6.10mm]
minimum minimum
B.17” [4.3mm] .16” [4.0mm]
maximum maximum
C.75” [19mm] .99” [25mm]
Rigid rod / flexible sheathing / flexible plus thermocouple version Exposed capillary version
6� Installation and positioning on the machine
TECHNICAL DATA
Extrusion processes require very high temperatures. Extrusion pressure can be checked by means of especially
designed transducers. Thanks to their special mechanical construction, in which the measurement element is
isolated from the Melt, they resist to such high temperatures. The constructive principle is based on hydraulic of
pressure; mechanical strain is transferred by means of a non-compressible transmission liquid.
Strain gauge technology translates the physical quantity (pressure) into an electrical signal.
Following advice for extending the sensors lifetime.
a) Avoid shocks and abrasions to the in contact diaphragm. Protect the transducer with its cover each
time you remove it from its seat.
b) The seat must be prepared perfectly and with appropriate tools in order to respect the depth and axiality
of the holes and tapping.
Pay particular attention to the coaxiality of the holes to the thread, because diaxialities greater than 0.2 mm will
break the transducer during assembly. It is essential that hole depth guarantees the absence of chambers or air
pockets in which extrusion material may be trapped.
To prevent contact with the extrusion screw or with tools used to clean the extrusion chamber, the front diaphragm
must not extend from the inner wall of the extruder.
c) Before assembling the transducer in machines already in operation, make sure that the housing is clean.
Remove any residual with the suitable cleaning device.
d) The transducer should be removed only with the machine empty (without pressure) but still hot.
e) The transducer should be cleaned with solvents for the material being processed.
Any mechanical action on the contact diaphragm modifies its operation and could break it.
6�1� Installation seat
For the mechanical dimensions please keep as reference the product datasheets or Gefran website www.gefran.com
11
80636B_MAN_HMF - HWF_05-2022_ENG
Drilling kit
A drilling kit with formed tools for drilling, reaming and tapping is available to facilitate correct preparation of
the assembly seat. The assembly seat must be perfect to assure proper transducer function and long lifetime.
Drilling kits are available in the following versions: KF12, KF18.
Drilling procedure
1) To drill hole (D4) up to a distance from the hole equal to the sum of (A+B+C) (tool 3).
2) Make the pass through hole (D2) by the tool 1.
3) To create the seal seat at a distance from the hole equal to dimension (A) (tool 4).
4) With a roughing tap, create threading 1/2-20UNF-2B (recognizable from the greater number of threads
beveled at the mouth) (tool 5).
5) With a finishing tap, go over threading 1/2-20UNF-2B up to a distance from the bottom equal to the sum
of (A+B) (tool 6).
6) To ream the hole (D2) with reamer (tool 2).
Installation seat check
The dimensions of the assembly seat have to be checked after preparation and before the transducer
installation.
Use dummy plug SC 12/18 as follows:
1) Coat the end of the rod with the appropriate ink.
2) Lubricate the threaded part to prevent friction.
3) Insert the dummy plug and screw it fully down.
4) Remove the rod and examine it.
With the exception of 45° surfaces, the ink should be intact on the entire surface.
6�2� Drilling tool kit CORRECT INSTALLATION
WRONG
WRONG
WRONG
CORRECT
VERSION CODE KF12 KF18
THREADING TYPE 1/2-20UNF-2B M18x1.5
1Ø 7.6 Ø 9.75
2Ø 7.95 Ø 10.1
3Ø 13 Ø 20
4Ø 11.5
with pilot guide
Ø 16
with pilot guide
51/2-20UNF-2B
roughing
M18x1.5
roughing
61/2-20UNF-2B
finishing
M18x1.5
finishing
Incorrect working or shape of the side can result in properties out of specification, bad behaviour
or damage to the sensor.
The side should be clean and without any polymer residual.
12 80636B_MAN_HMF - HWF_05-2022_ENG
CORRECT SEAL
contact surface
TRANSDUCER INSTALLATION
Installation procedure
1) Make sure the drilling procedure has been realized correctly. If the sensor is installed in a previously used
hole, make sure the hole is completely clean and free of any plastic residual.
2) Remove the protective cap from the sensor tip.
3) Lubrificate the thread with non-grip grease such as Neverseez (Bostik), or C5A (Felpro), or equivalent.
4) Insert firmly the sensor into the hole, first by hand and then with a wrench, 1/4 turn at a time.
Recommended torque: 50 Nm, the maximum is 56.5 Nm.
Removal (Fig. 6.1.)
To remove the transducer from its seat and carry on the working process, dummy plugs with identical mecha-
nical dimensions are available.
The dummy plugs differ by type of threading; max pressure range is 2000 bar for all rods.
The dummy plugs are available in the following versions: SC12 1/2-20UNF seat - SC18 M18x1,5 seat.
Brackets (Fig. 6.2.)
Models with flexible sheaths require the housing precise fixing. Suitable fastening brackets (SF18) are recom-
mended.
Remember that the fastening point must be vibration-free (vibrations affect the measurement) and that tem-
peratures must not exceed the maximum temperature range for the strain gauge housing (as stated on the
sensor technical sheet).
Extruder starting
Bring the system to working temperature with the transducer installed and without any pressure applied.
Wait until all the material is at the same temperature to prevent the transducer damage by semi-solid material.
Seat cleaning & Cleaning tool
As mentioned in the notes, the seat must be cleaned before the transducer installation.
The cleaning tool is a hard metal cutting tool specially designed to remove working materials residuals.
Recommended procedure (Fig. 6.3.)
The following procedure must be implemented with the material in a fluid condition.
1) Insert the tool in the seat and screw down the cutting rod (normally a 1/4 turn at a time).
2) Turn the pilot cutter clockwise until there is no resistance to cutting.
3) Repeat the procedure until the seat is completely clean.
For constructive reasons, the maximum torque applicable to the cutter is 15 Nm (1.5 Kgm).
If the hole occlusion requires higher torque for removal, use the drilling kit and follow the recommended
procedure.
The cleaning tool is available in the following versions: CT12 1/2-20UNF seat - CT18 M18x1,5 seat.
Fig� 6�3�
Fig� 6�2�
Fig� 6�1�
13
80636B_MAN_HMF - HWF_05-2022_ENG
6�3� Wiring and calibration
Connections
The sensors have to be connected as shown in the diagram at chapter 7.
To obtain a higher immunity from field noise, connect the cable shield to the female connector case on sen-
sor side.
Calibration procedure using the magnetic pen/Pin CAL
Bring the system to the working temperature with the transmitter installed and connected to the measure-
ment instrument without any pressure applied.
The measurement chain connected to the transmitter is calibrated as follows:
1) To reset the offset on the instrument by eliminating the thermal drift with the autozero function.
With the sensor installed and the extruder at working temperature, wait until the temperature itself is
stable, with a possible variation of ±1°C. Consequently Autozero can be activated.
This allows to compensate all the signal drifts caused by tightening and temperature.
Additional Autozero activations could be run once the temperature stability is reached, with ±1°C of
possible variation.
2) Calibrate the instrument activating the CAL function. The transducer brings its output to the calibration
value shown on the transducer data plate (80% of full scale default, if changed with HART command it
could be different).
With the external Autozero function the calibration procedure is not feasible.
3) If the instrument does not exactly indicate zero, repeat points 1) and 2).
In this way, the instrument is calibrated to give the exact indication in the chosen engineering unit.
Calibration procedure using HART communication
Bring the system to the working temperature with the transmitter installed and connected to the measure-
ment instrument without any pressure applied.
1)ConnectCommunicatortotheloop.Incaseit’snotsureonhowtodothis,pleasereferto“Connecting
the HART Handheld Communicator” (Fig. 8.1).
2) Switch on HART Communicator. Please refer to HART Command tree on Ready-to-Use guide.
3) From the Main Menu:
a. Enter Tag (Fast Key 1, 3, 1)
b. Set Pressure Units (Fast Key 1, 3, 3), if needed
c. Set URV (Fast Key 1, 3, 4) if output turndown (rescaling), is needed
d. Perform Autozero (Fast Key 1, 2, 6, 3, 1)
4) Check loop output is zero (4mA).
5) Remove HART Communicator from loop.
ORDER CODES FOR TOOLS and ACCESSORIES
CLEANING TOOL KIT
1/2-20UNF 12
M18x1,5 18
CT
MOUNTING BRACKET SF 18 DUMMY PLUG
1/2-20UNF 12
M18x1,5 18
SC
DRILL KIT
1/2-20UNF 12
M18x1,5 18
KF
14 80636B_MAN_HMF - HWF_05-2022_ENG
7� Electrical Connections
The interface to controller is:
-amulti-polar cable outlet with conduit output type ½ 14-NPT as illustrated in Fig. 7.1..
where are also pointed out the connections (2 wires connection current amplified). In the case of relay
output with retransmitted output in current (2 wires) the connections are shown in Fig. 7.2.
CURRENT OUTPUT (NO RELAY)
The cable shield is tied to both sides, i.e. to the sensor connector and to the controller
Fig� 7�1�
Fig� 7�2�
Cable outlet (1/2 14-NPT) L = 1 m
Current output
15
80636B_MAN_HMF - HWF_05-2022_ENG
8� Command modes
The command modes must be used by the user only to make periodical recalibrations of the system in the
process, and are made through:
• Magnetic sensor/Pin CAL
• HART Communication
The event combinations give the following functions:
1. Autozero
2. Calibration (CAL)
3. Reset autozero
1) Autozero
Warning: the periodical zero ricalibration through the Autozero function must be done at stable tempe-
rature and no pressure in the extrusion chamber.
1) Machine pressure = 0 bar and transducer
powered.
2) Put magnetic pen on marked spot
(2...5 seconds).
3) Remove magnetic pen.
4) Ready !
Remove
Magnetic
pen
2...5 seconds = marked spot
Application mode Limits Result
FS (bar) % adjustment
The Autozero function is activated
by :
1) positioning the magnet near the
Autozero label on the shell of the
sensor.
2) Short-circuiting the pin E-F
(external Autozero version).
The magnet has to be maintained
on the Autozero position for a time
within 2 to 5 seconds.
≤35 100 The Autozero effect will be visible after
waiting 2 seconds starting from the fun-
ction removal.
The precision of the zero value will be
defined by the accuracy class of the
sensor.
> 35, < 100 40
> 100, < 200 20
≥200 10
NOTE: For all transmitters with current outputs, during the Autozero phase, output can rise up to 7 mA.
That’sashortvariationonlyvisibleduringtheAutozerophase;itwon’thaveanyeffectsonthefinalsignal.
8�1� Using Magnetic pen and Pin CAL
16 80636B_MAN_HMF - HWF_05-2022_ENG
2) CAlibrAtion (CAl)
Application mode Limits Result
Start CAL:
The Calibration function is activated
by short-circuiting the pin E – F for a
minimum time of 1 second.
Stop CAL:
Release the E - F short-circuit.
The whole Zero unbalancement in
comparison to the zero done by the
manufacturer, has to be ± 20%FS.
During the Calibration phase the signal
will be unbalanced to the 80% FS.
The calibration effect is visible 2 secon-
ds after short-circuiting E - F.
TheCalibrationfunctiondoesn’twork
outside the defined limits..
NOTE:
TheCalibrationfunctionisnotallowedfor“externalAutozero”version.
3) totAl reset of the CAlibrAtion vAlues
Application mode Limits Result
The magnet has to be maintained
on the Autozero position for a time
of 20 to 25 seconds.
The Zero and Span of the transmitter
will be recalibrated to the factory
settings.
NOTE:
In the current transducers output value, when applying the magnet can see an imbalance of the output signal up to
7mA.
17
80636B_MAN_HMF - HWF_05-2022_ENG
During HART Handheld Communicator connection
In case of hazardous areas please refer to the handheld communicator user manual for instructions for
using HART Communicator correctly.
Please consider a minimum of 250 Ohm resistance has to be present in the loop. The loop current is not
measured directly by the HART Communicator.
Anywhere along the 4-20 mA wire the HART Communicator can interface with the device.
Please see the picture below (Fig. 8.1).
8�2� Using HART communication
Fig� 8�1� Hart Handheld Communicator Interface
Procedure
1� Connect Power Supply and HART Communicator as in the above drawing.
2� In case of commissioning on the bench with a dead weight tester or with a calibrated pressure generator,
please check pressure connection is not leaking.
3� Apply power to the transmitter and switch on the HART Communicator by pressing using the ON/OFF key.
The HART Communicator LCD display should show H Pressure Transmitter in the upper left corner.
If this is not present, please refer to chapter 9. ”Safety”, Troubleshooting section.
4� Set PV Units (Fast Key 1, 3, 3) to proper pressure unit (e.g. bar, psi, kgf/cm², MPa, etc.).
5� Set Tag (Fast Key 1, 3, 1).
6� In case the transmitter output has to be re-ranged, fix the proper LRV (Fast Key 7,1) and URV (Fast Key 8, 1).
Note:URVcan’tbeturneddownbelowthePVMinimumspan(FastKey1,3,4).
Attention: after modification of LRV and/or URV value/s, it's needed to verify that the parameterization process
has been successfully concluded, through a reference of pressure at LRV and URV values.
7� Fix Lower Trim with device variable trim method (Fast Key 1, 2, 6, 3, 3).
8� Check transmitter output. Zero pressure output should read 4 mA.
Attention:
The following phases are not part of a standard system setup and should be carried out by qualified personnel
only.
Accordingtothispleaseconsiderthetransmitterisverysteadyandit’sbeenaccuratelycalibratedinourfactory
using precise pressure sources. Such a task should only be carried out using these type of devices.
18 80636B_MAN_HMF - HWF_05-2022_ENG
9� By means of calibrated pressure generator, apply the same pressure already set in URV during step 6.
Outputshouldequal20mA.Incaseoutputisn’t20mA,pleasegotostep10.
10. In order to calibrate full scale output, please apply firstly pressure equal to full scale pressure.
Then you can proceed to set Upper Trim value with Device Variable Trim method (fast key 1, 2, 6, 3, 3;
anyhow please consider Lower Trim value has to be done).
Now output should be the same of the full scale pressure.
11� When transmitter Output Damping is needed, please set PV Damping (fast key 1, 3, 6) to the proper value.
12� Press the left arrow key until the HART Communicator is off-line. Then switch off the power.
At this point the pressure transmitter can be installed in the process.
Autozero using HART communication
With the transmitter installed and connected to the measurement instrument without any pressure applied
and with the system at the working temperature, once temperature itself is stable, i.e. with a possible variation
of ± 1°C, Autozero can be performed. If the zero trim function is selected (fast key 1, 2, 6, 3, 1) the output will
be modified to show zero pressure. Such a task is carried out by the transmitter electronics automatically by
regulating digital PV to zero while analog output will be 4 mA.
Usually an Autozero is all that is needed once installation is completed as the transmitter span has been
calibrated at the factory.
In case the Full Scale Output is not correct when tested with a calibrated pressure source or dead weight
tester, the transmitter span can be regulated using the Device Variable Trim method (fast key 1, 2, 6, 3, 3).
Please apply Zero Pressure firstly and follow the prompts on the handheld HART Communicator. Once
completed, please apply a known calibrated full scale pressure to the transmitter and follow the prompts on the
handheld HART Communicator. Once completed, the digital PV will be corrected to full scale output.
Transmitter functions using HART communication
(with fast key sequences)
Autozero (1, 2, 6, 3, 1)
Digital modification to zero: it affects both the digital and analog output. Please consider this operation is diffe-
rent from Lower Sensor Trim as Autozero has to be done ONLY at zero pressure.
Reset Autozero (1, 2, 6, 3, 2)
Reset Autozero correction.
Device Variable Trim (1, 2, 6, 3, 3)
Digital modification to zero and full scale: it affects both the digital and analog output.
Please consider this operation is different from Autozero as Lower Sensor Trim can be made at positive pres-
sures, i.e. above zero.
Note: Such an operation has to be carried out with a known calibrated pressure source only.
D/A trim (1, 2, 6, 2)
This function is used to match the digital representation of the analog output with its real analog loop current.
Note: Such an operation should be carried out with a known calibrated current (mA) meter only.
Re-range
The 4mA and 20mA points, i.e. LRV and URV respectively, can be regulated in order to improve output reso-
lution.ThismeansaRe-range(alsocalled“Turndown”)ratioof3:1ispossible.
Please consider accuracy data is reliant upon the Full Sensor Range without applying any turndown.
Note: In case pressure applied to the transmitter is not in the range of the 3:1 turndown ratio, the transmitter
will refuse the command.
Such a condition will be shown by the output not adjusting to 20mA after a few requests.
19
80636B_MAN_HMF - HWF_05-2022_ENG
LRV Rerange (7, 1)
This function is the pressure at which the transmitter will display a 4 mA output as entered directly by the ope-
rator. LRV variation affects the transmitter span so the range is restricted by the minimum span value found in
fast key (1, 3, 4, 3).
URV Rerange (8, 1)
This is the pressure at which the transmitter will display a 20 mA output as entered directly by the operator.
This range is restricted by the minimum span value found in fast key (1, 3, 4, 3).
LRV Rerange by applying a known pressure (1, 2, 6, 1, 2)
Such a function is performed by applying a known pressure and starting the procedure in order to set the 4mA
point according to the pressure reference value.
Note: Such an operation should be carried out with a calibrated pressure source only.
URV Rerange by applying a known pressure (1, 2, 6, 1, 2)
Such a function is performed by applying a known pressure and starting the procedure in order to set the 20mA
point according to the pressure reference value.
Note: Such an operation should be carried out with a calibrated pressure source only.
Device Variable Trim reset (1, 2, 6, 4)
This function is used to restore the Zero, Lower, and Upper Trim to the factory setting values.
R-Cal (1, 2, 6, 5)
Activating R-Cal, the output will be fixed to the percentage of span fixed by such function.
80% is default value.
Damping (1, 3, 6)
The damping time constant affects the speed with which the output signal reacts to changes in pressure as
shown in the figure on the next page.
By default damping is off, but values between 0 and 30 seconds can be fixed using the handheld communicator.
Only one decimal digit is allowed.
See also specific notes on response time in Functional Safety Notes (chapter 10)
20 80636B_MAN_HMF - HWF_05-2022_ENG
Status (1, 2, 1, 1)
Reads Device Status.
The status is shown in 3 bytes:
Standardized Device Status:
Bit Function
0 Reserved
1 Non volatile memory failure
2 Not used
3 Watchdog reset executed
4 Voltage conditions out of range
5 Not used
6 Not used
7 Not used
Sensor Status 1:
Bit Function
0 Input stage error
1 Sensor overrange
2 Sensor broken
3 Micro controller overheated
4 Error parameter
5 Voltage error
6 Watchdog error
Bit Function
7 Cycle error
Sensor Status 2:
Bit Function
0 Reserved
1 Sensor under range
2 Low loop voltage
3 Not used
4 Not used
5 Not used
6 Not used
7 Not used
PV Unit (1, 3, 3)
The PV unit sets the unit of measure that the pressure related parameters are transmitted. The transmitter can
be configured using several engineering units such as psi, bar, MPa, and kgf/cm² and many others.
This manual suits for next models
5
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