Aalborg GFC Operating Manual

Technical Data Sheet No. TD9709M Rev. R

Date of Issue: March 2018

OPERATING MANUAL

GFC MASS FLOW

CONTROLLER

TABLE OF CONTENTS

1. UNPACKING THE GFC MASS FLOW CONTROLLER........................

1.1 Inspect Package for External Damage..............................................

1.2 Unpack the Mass Flow Controller.......................................................

1.3 Returning Merchandise for Repair.....................................................

2. INSTALLATION....................................................................

2.1 Primary Gas Connections.................................................................

2.2 Electrical Connections......................................................................

2.2.1 Valve Control Configuration...........................................

2.2.2 Remote LCD Readouts...................................................

2.2.3 Panel Mounting Readouts...............................................

3. PRINCIPLE OF OPERATION....................................................

4. SPECIFICATIONS..................................................................

4.1 CE Compliance................................................................................

4.2 Flow Capacities.................................................................................

5. OPERATING INSTRUCTIONS...................................................

5.1 Preparation and Warm Up................................................................

5.2 Flow Signal Output Readings..............................................................

5.3 Swamping Condition...........................................................................

5.4 Setpoint Reference Signal..................................................................

5.5 Valve OFF Control (Open Collector NPN Compatible)..........................

5.6 Valve Test/Purge.................................................................................

6. MAINTENANCE....................................................................

6.1 Introduction........................................................................................

6.2 Flow Path Cleaning..............................................................................

6.2.1 Cleaning the Inlet Filter Screen in GFC Models...............

6.2.2 Valve Maintenance for GFC17/37/47 Models.....................

7. CALIBRATION PROCEDURES....................................................

7.1 Flow Calibration...................................................................................

7.2 Calibration of GFC17/37/47 Mass Flow Controllers..........................

7.2.1 Connections and Initial Warm Up...................................

7.2.2 Zero Adjustment.............................................................

7.2.3 SPAN Adjustment...........................................................

7.2.4 Linearity Adjustment......................................................

7.2.4.1 Disable Solenoid Valve in GFC17/37/47 Models..............

1 1 1 1

2 2 2 5 6 6

7 10 10

11 11 12 12 13 14 14

15 15 15 15 16

18 18 19 19 20 20 20 20

7.2.5 Connections and Initial Warm Up..................................

7.2.6 ZERO Adjustment..........................................................

7.2.7 25% Flow Adjustment Using R33 Potentiometer............

7.2.8 10% Flow Adjustment.....................................................

7.2.9 25% Flow Adjustment (using R52 potentiometer).........

7.2.10 50% Flow Adjustment....................................................

7.2.11 75% Flow Adjustment.......................................................

7.2.12 100% Flow Adjustment..................................................

7.2.13. Valve adjustment.............................................................

7.2.13.1 Valve Adjustment for GFC 17/37/47..................................

7.2.14 Close Loop Full Scale Flow Adjustment...........................

7.2.15 10% Close Loop Flow Adjustment

(using R33 potentiometer).............................................

7.2.16 25% Close Loop Flow Adjustment

(using R52 potentiometer).............................................

7.2.17 Close Loop 25% Flow Adjustment

(using R33 potentiometer).............................................

7.2.18 Close Loop 50% Flow Adjustment....................................

7.2.19 Close Loop 75% Flow Adjustment...................................

7.2.20 Close Loop 100% Flow Adjustment...................................

7.3 Calibration of GFC57/67/77 Mass Flow Controllers.........

7.3.1 Connections and Initial Warm Up...................................

7.3.2 ZERO Adjustment................................................................

7.3.3 SPAN Adjustment.............................................................

7.3.4 Linearity Adjustment.......................................................

7.3.4.1 Open Motorized Valve in GFC57/67/77 Models.................

7.3.5 Connections and Initial Warm Up...................................

7.3.6 ZERO Adjustment............................................................

7.3.7 25% Flow Adjustment.........................................................

7.3.8 50% Flow Adjustment.....................................................

7.3.9 75% Flow Adjustment.....................................................

7.3.10 100% Flow Adjustment.....................................................

7.3.11. Valve adjustment..............................................................

7.3.11.1 Valve Adjustment for GFC 57/67/77.................................

7.3.12 Full Scale Flow Adjustment.................................................

7.3.13 25% Flow Adjustment.....................................................

7.3.14 50% Flow Adjustment........................................................

7.3.15 75% Flow Adjustment.......................................................

7.3.16 100% Flow Adjustment..................................................

7.4 LCD Display Scaling.........................................................

7.4.1 Access LCD Display Circuit..............................................

7.4.2 Adjust Scaling..................................................................

7.4.3 Change Decimal Point.....................................................

21 21 21 22 22 22 22 22 23 23 23

23 24 24 24 24 25 25 25 26 26 26 26 26 27 27 27 27 27 28 28 28 28 28 28 29 29 29

8. TROUBLESHOOTING.............................................................

8.1 Common Conditions...........................................................................

8.2 General Troubleshooting Guide.........................................................

8.3 GFC17/37/47 Valve Related Troubleshooting.....................................

8.4 Technical Assistance.........................................................................

9. CALIBRATION CONVERSIONS FROM REFERENCE GASES................

APPENDIX 1 COMPONENT DIAGRAM..................................................

APPENDIX 2 GAS FACTOR TABLE (“K” FACTORS)...............................

APPENDIX 3 DIMENSIONAL DRAWINGS.............................................

APPENDIX 4 WARRANTY......................................................................

29 29 30 32 35

1. UNPACKING THE GFC MASS FLOW CONTROLLER

1.1 Inspect Package for External Damage

Your GFC Mass Flow Controller was carefully packed in a sturdy cardboard carton, with anti-static cushioning materials to withstand shipping shock. Upon receipt, inspect the package for possible external damage. In case of external damage to the package contact the shipping company immediately.

1.2 Unpack the Mass Flow Controller

Open the carton carefully from the top and inspect for any sign of concealed shipping damage. In addition to contacting the shipping carrier please forward a copy of any damage report to your distributor or Aalborg7 directly.

When unpacking the instrument please make sure that you have all the items indicated on the Packing List. Please report any shortages promptly.

1.3 Returning Merchandise for Repair

Please contact the customer service representative of your distributor or Aalborg7 if you purchased your Mass Flow Controller directly, and request a Return

Authorization Number (RAN). Equipment returned without an RAN will not be accepted. Aalborg7 reserves the right to charge an evaluation fee for equip-

ment returned under warranty claims if the instruments are tested to be free from warrantied defects.

Shipping charges are borne by the customer. Items returned “collect” will not be accepted!

It is mandatory that any equipment returned for servicing be purged and neutralized of any dangerous contents including but not limited to toxic, bacterially infectious, corrosive or radioactive substances. No work shall be performed on a returned product unless the customer submits a fully executed, signed SAFETY CERTIFICATE. Please request form from the Service Manager.

CAUTION: Some of the IC devices used in the GFC are Electro Static Discharge (ESD) sensitive and may be damaged by improper handling. When wiring the interface connector, adjusting or servicing the meter, use of a grounded ESD protection wrist strap is required to prevent inadvertent damage to the CMOS integral solid state circuitry. When 15 pins inter face D-connector is not used do not remove factory installed ESD protection cover.

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2. INSTALLATION

2.1 Primary Gas Connections

Please note that the GFC Mass Flow Controller will not operate with liquids. Only clean gases are allowed to be introduced into the instrument. Contaminated gases must be filtered to prevent the introduction of impediments into the sensor.

CAUTION: It is the users responsibility to determine if the instrument is appropriate for their OXYGEN application, and for specifying O2 cleaning service if required. Aalborg7 is not liable for any damage or personal injury, whatsoever, resulting from the use of this instrument for oxygen gas.

Attitude sensitivity of the Mass Flow Controller is ±15

. This means that the gas flow path of the flow meter must be horizontal within those stated limits. Should there be need for a different orientation of the meter, re-calibration may be necessary. It is also preferable to install the GFC transducer in a stable environment, free of frequent and sudden temperature changes, high moisture, and drafts.

Prior to connecting gas lines inspect all parts of the piping system including ferrules and fittings for dust or other contaminants. Be sure to observe the direction of gas flow as indicated by the arrow on the front of the meter when connecting the gas system to be monitored.

Insert tubing into the compression fittings until the ends of the properly sized tubings home flush against the shoulders of the fittings. Compression fittings are to be tightened according to the manufacturer's instructions to one and one quarter turns. Avoid over tightening which will seriously damage the Restrictor Flow Elements (RFE's)!

Compression fittings should not be removed unless the meter is being cleaned or calibrated for a new flow range.

Using a Helium Leak Detector or other equivalent method perform a thorough leak test of the entire system.

(All GFC's are checked prior to shipment for leakage

within stated limits. See specifications in this manual.)

2.2 Electrical Connection

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CAUTION: Some of the IC devices used in the GFC are Electro Static Discharge (ESD) sensitive and may be damaged by improper handling. When wiring the interface connector, adjusting or servicing the meter, use of a grounded ESD protection wrist strap is required to prevent inadvertent damage to the CMOS integral solid state circuitry. When 15 pins interface D-connector is not used do not remove factory installed ESD protection cover.

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CAUTION: WIRING THE GFC METER OR CHANGING NJ1 JUMPERS CONFIGURATION WITH THE POWER ON MAY RESULT IN INTERNAL DAMAGE! PLEASE MAKE ALL WIRING CONNECTIONS AND NJ1 JUMPERS INSTALLATIONS BEFORE SWITCHING ON THE POWER.

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Base on the GFC transducers model number it may require different power supply voltage: ether 12Vdc, 24Vdc or universal (any voltage between 12 and 26 Vdc). Before connecting power supply check controller power supply requirements label located on the controller back cover. If power supply requirements label states that power supply requirements is 12 Vdc, do not connect power supply with voltage above 15 Vdc. Exceeding specified maximum power supply voltage limit will result in device permanent damage.

The operating power input is supplied via the 15-pin “D” connector located at the side of the flow transducer enclosure. On GFC's purchased without an LCD readout, a readout panel meter, digital multimeter, or other equivalent device is required to facilitate visual flow readings.

A built in SETPOINT potentiometer is used for local control of the flow. Variable analog 0 to 5 Vdc (or 4 to 20 mA) reference input is required for remote control.

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PIN FUNCTION

1 0 to 5 Vdc Flow Signal Common 2 0 to 5 Vdc Flow Signal Output 3 Common 4 Open (Purge) 5 Common, Power Supply 6 (unassigned) 7 +12 Vdc (Optional +24 Vdc*) Power Supply 8 Remote Setpoint Input 9 4 to 20 mA (-) Flow Signal Return (use with 14) 10 Remote Setpoint Common (use with 8) 11 +5 Vdc Reference Output for Remote Setpoint 12 Valve Off Control 13 Auxiliary +12 Vdc (Optional +24 Vdc*)

Power Output (For Loads <100 mA) 14 4 to 20 mA (+) Flow Signal Output 15 Chassis Ground

FIGURE 2-1 GFC 15-PIN “D” CONNECTOR CONFIGURATION

*Do not connect +24 Vdc power supply unless your GFC controller was ordered

and configured for 24 Vdc

5 & 7

+12 Vdc (Optional +24 Vdc*) POWER SUPPLY

8 & 10

0-5 Vdc OR 4-20 mA (FROM 3 WIRE LOOP SOURCING DEVICE) REMOTE SETPOINT

9 & 14

4-20 mA OUTPUT (SOURCING, ONLY FOR PASSIVE LOAD)

10 & 11 +5 Vdc CONTROL SOURCE

1 & 2 0-5 Vdc OUTPUT

3 & 4 PURGE

3 & 12 VALVE OFF CONTROL

5 & 13

AUXILIARY +12 Vdc (Optional +24 Vdc*) POWER OUTPUT (FOR LOADS <100 mA)

CAUTION: BEFORE CONNECTING THE POWER SUPPLY CHECK YOUR CONTROLLER MODEL NUMBER AND POWER SUPPLY REQUIREMENTS LABEL LOCATED ON THE CONTROLLER BACK COVER. DO NOT CONNECT 24 Vdc POWER SUPPLY UNLESS YOUR GFC CONTROLLER WAS ORDERED AND CONFIGURED FOR 24 Vdc. EXCEEDING THE SPECIFIED MAXIMUM POWER SUPPLY VOLTAGE LIMIT MAY RESULT IN PERMANENT DEVICE DAMAGE.

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Important Notes:

In general, “D” Connector numbering patterns are standardized. There are, however, some connectors with nonconforming patterns and the numbering sequence on your mating connector may or may not coincide with the numbering sequence shown in our pin configuration table above. It is imperative that you match the appropriate wires in accordance with the correct sequence regardless of the particular numbers displayed on your mating connector.

Power must be turned OFF when connecting or disconnecting any cables in the system.

The power input is protected by a 900mA (GFC17/37/47) or 1600mA (GFC57/67/77) M (medium time-lag) resettable fuse. If a shorting condition or polarity reversal occurs, the fuse will cut power to the flow transducer circuit. Disconnect the power to the unit, remove the faulty condition, and reconnect the power. The fuse will reset once the faculty condition has been removed.

Use of the GFC flow transducer in a manner other than that specified in this manual or in writing from Aalborg7, may impair the protection provided by the equipment.

CAUTION: Fuse will not protect controller if power supply voltage exceeds maximum voltage specified for a particular model.

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NR7 LOCAL SET POINT POTENTIOMETER

R34 ZERO POTENTIOMETER

R38 50%

R39 75%

R40 100%

R33 SPAN (10 or 25%)

R1 RESPONSE TIME AJUSTMENT

NJ1 CONTROL CIRCUT JUMPERS

R52 10 or 25 %

FIGURE 2-2, POTENTIOMETER AND JUMPER LOCATIONS

2.2.1 Valve Control Configuration

There are three basic valve control options.

(a) LOCAL or REMOTE control. (b) 0 to 5 Vdc or 4 to 20 mA setpoint signal -

*Note: this only applies for the REMOTE control configuration;

When active, the 2% cutoff will shut off the power to the valve when a setpoint of less than 2% of the full scale flow range is set. Figure 2-3 shows the jumper configurations for the three basic valve control options.

The factory default jumper settings are: LOCAL control, 2% cutoff off.

FUNCTION NJ1A NJ1B NJ1C NJ1D NJ1E

Remote

0 to 5 Vdc 2% cutoff ON

2 - 3 5 - 6 8 - 9 10 - 11

13 - 14 0 to 5 Vdc 2% cutoff OFF 14 -15 4 to 20 mA 2% cutoff ON

1 - 2 4 - 5 7 - 8 10 - 11

13 - 14 4 to 20 mA 2% cutoff OFF 14 - 15

Local

2% cutoff ON

2 - 3 5 - 6 8 - 9 11 - 12

13 -14

2% cutoff OFF 14 - 15

6 9 12 15 2581114 1 4 7 10 13

ABCDE

FIGURE 2-3, VALVE CONTROL CONFIGURATION JUMPERS

2.2.2 Remote LCD Readouts

GFC Mass Flow Controllers are available with optional remote reading LCD displays supplied with a three foot long wire to accommodate most applications. This configuration includes the upper block element which serves as the LCD readout mounting. Special lengths of remote extension wiring (up to 9.5 feet [3 meters]) are available on request.

2.2.3 Panel Mounting Readouts

Another option for the GFC Mass Flow Controller is the Panel Mounting Remote Readout.

In this configuration the LCD readout is supplied with a three foot long extension wire, and no aluminum housing around the LCD. The LCD readout for panel mounting includes a bezel with two plastic screws which conveniently fit into a rectangular cut-out for panel mounting (see Figure 2-4).

FIGURE 2-4 CUTOUT DIMENSIONS FOR LCD PANEL MOUNTING

3. PRINCIPLE OF OPERATION

The stream of gas entering the Mass Flow transducer is split by shunting a small portion of the flow through a capillary stainless steel sensor tube. The remainder of the gas flows through the primary flow conduit. The geometry of the primary conduit and the sensor tube are designed to ensure laminar flow in each branch. According to principles of fluid dynamics flow rates of gas in two properly sized laminar flow conduits are related to one another. Therefore, the flow rates measured in the sensor tube are directly proportional to the total flow through the transducer.

In order to sense the flow in the sensor tube, heat flux is introduced at two sections of the sensor tube by means of precision wound heater-sensor coils. Heat is transferred through the thin wall of the sensor tube to the gas flowing inside. As gas flow takes place heat is carried by the gas stream from the upstream coil to the downstream coil windings. The resultant temperature dependent resistance differential is detected electronically. The measured gradient at the sensor windings is linearly proportional to the instantaneous rate of flow taking place.

An output signal is generated that is a function of the amount of heat carried by the gases to indicate mass-molecular based flow rates.

GFC Mass Flow Controller models GFC17/37/47 also incorporate a proportionating solenoid valve and models GFC57/67/77 a motorized valve. The closed loop control circuit of the GFC continuously compares the mass flow output with the selected flow rate. Deviations from the setpoint are corrected by compensating valve adjustments, thus maintaining the desired flow parameters.

4. SPECIFICATIONS

FLOW MEDIUM: Please note that GFC Mass Flow Controllers are designed to work with clean gases only. Never try to meter or control flow rates of liquids.

CALIBRATIONS: Supplied at Standard Conditions (14.7 psia and 70

F), or Normal

Conditions (0

C and 1.01 bar abs) unless otherwise requested or stated.

ENVIRONMENTAL (per IEC 664): Installation Level II; Pollution Degree II.

ACCURACY: GFC17/37/47: ±1.0% F.S.

GFC 57/67/77: See table below.

ACCURACY % FS OPTIONAL ENHANCED ACCURACY % FS

MODEL

GFC 57, 67, 77

MODEL GFC 57, 67, 77

FLOW RANGE

20-100%

0-20%

FLOW RANGE

20-100%

0-20%

ACCURACY

±1.5% ±3%

ACCURACY

±1%

REF DATA with ±1%

REPEATABILITY: ±0.5% of full scale.

TEMPERATURE COEFFICIENT: 0.15% of full scale/

PRESSURE COEFFICIENT: 0.01% of full scale/psi (0.07 bar).

RESPONSE TIME: GFC17: 300ms time constant; approximately 1 second to within

±2% of set flow rate for 25% to 100% of full scale flow.

GFC 37/47: 600ms time constant; approximately 2 seconds to within ±2% of set flow rate for 25% to 100% of full scale flow.

GFC 57/67/77: 1800ms time constant; approximately 5 seconds to within ± 2% of set flow rate for 25% to 100% of full scale flow.

MAX GAS PRESSURE: 1000 psig (69 bars) GFC 17, 37 and 47; 500 psig (34.5 bars) GFC 57, 67 and 77. Optimum pressure is 20 psig (1.4 bars).

TURNDOWN RATIO: 40:1.

MAX DIFFERENTIAL PRESSURE: 50 psid (345 kPa) for GFC 17/37/57/67/77 AND 40 psid

(276 kPa) for GFC 47.

GAS TEMPERATURE: 32

F to 122 FF (0 FC to 50 FC).

AMBIENT TEMPERATURE:14

F to 122 FF (-10 FC to 50 FC).

GAS RELATIVE HUMIDITY: Up to 70%.

MAXIMUM INTERNAL LEAK: 0.5% FS.

LEAK INTEGRITY: 1 x 10

-9

sccs He max to the outside environment.

ATTITUDE SENSITIVITY: No greater than ±15 degree rotation from horizontal. Standard calibration is in horizontal position.

OUTPUT SIGNALS: Linear 0 to 5 Vdc (1000 Ω minimum load impedance) and 4 to 20 mA (0 to 500 Ω loop resistance, sourcing only for passive load); 20 mV peak to peak max noise for GFC 17/37/47 and 100 mV peak to peak max noise for GFC 57/67/77.

COMMAND SIGNAL: Analog 0 to 5 Vdc (100 K minimum input impedance) or 4 to 20 mA (250 Ω input impedance, use only with 3 wire 4-20 mA loop sourcing device).

Contact your distributor or Aalborg7 for optional RS232 or RS485 interfaces.

TRANSDUCER INPUT POWER:

GFC17/37/47: Models with 12 Vdc power input 12 Vdc, 650 mA maximum; GFC17/37/47: Models with 24 Vdc power input +24 Vdc, 650 mA maximum; GFC57/67/77: Models with 12 Vdc power input 12 Vdc, 800 mA maximum; GFC57/67/77: Models with 24 Vdc power input 24 Vdc, 800 mA maximum; GFC17/37/47: Models with universal power input any voltage between +12 and +26 Vdc,

650 mA maximum;

WETTED MATERIALS:

GFC17/37/47/57/67/77: Anodized aluminum, brass, 416 Stainless Steel and 316 stainless

steel with VITON7 O-rings seals; BUNA-N7, EPR or KALREZ7 O-rings are optional.

GFC17S/37S/47S/57S/67S/77S: 416 Stainless Steel and 316 stainless steel with VITON7 O-rings seals; BUNA-N7, EPR or KALREZ O-rings are optional.

Aalborg7 makes no expressed or implied guarantees of corrosion resistance of mass flow meters as pertains to different flow media reacting with components of meters. It is the customers sole responsibility to select the model suitable for a particular gas based on the fluid contacting (wetted) materials offered in the different models.

CONNECTIONS:

GFC 17 and 37: 1/4" compression fittings. Optional: 6mm compression, 1/4" VCR7,

3/8" or 1/8" compression fittings.

GFC 47: 3/8" compression fittings. GFC 57 3/8" compression fittings. GFC 67: 1/2" compression fittings. GFC 77: 3/4" FNPT fittings. Optional: 3/4" compression fittings.

LCD DISPLAY: 3½ digit LCD (maximum viewable digits “1999”), 0.5 inch high characters.

On GFC171, GFC371, GFC471, GFC571, GFC671, GFC771 aluminum or stainless steel models the LCD display is built into the upper block element and may be tilted over 90 degrees for optimal viewing comfort. Remote or panel mounting remote reading is optional.

Standard readings are in direct engineering units for the given gas and flow rate (i.e. liters/minute [slpm], standard cubic centimeters/minute [sccm], standard cubic feet/hour [scfh], etc.). 0 to 100% LCD calibration scaling is available upon request at time of order. Contact your distributor or Aalborg7 when non-standard display settings are desired.

TRANSDUCER INTERFACE CABLE: Optional shielded cable is available mating to the GFC transducer 15-pin “D” connector.

4.1 CE Compliance

GFC Mass Flow Controllers are in compliance with CE test standards stated below:

EMC Compliance with 89/336/EEC as amended; Emission Standard: EN 55011:1991, Group 1, Class B Immunity Standard: EN 55082-1:1992

TABLE I GFC 17 LOW FLOW MASS FLOW CONTROLLER*

4.2 Flow Capacities

MODEL CODE

mL/min [N2]

CODE

liters/min [N2]

01 10 07 1 02 20 08 2

03 50 09 5 04 100 10 10 05 200 06 500

TABLE II GFC 37 MEDIUM FLOW MASS FLOW CONTROLLER*

TABLE III GFC 47/57/67/77 HIGH FLOW MASS FLOW CONTROLLER*

*Flow rates are stated for Nitrogen at STP conditions [i.e. 70 FF (21.1 FC) at 1 atm].

For other gases use the K factor as a multiplier from APPENDIX 2.

MODEL CODE

liters/min [N2]

15 30 20 31 30

32 40 33 50

MODEL

CODE

liters/min [N2]

40 60 41 80

42 100

50 200

67 60 500 77 70 1000

FLOW RANGES

5. OPERATING INSTRUCTIONS

5.1 Preparation and Warm Up

It is assumed that the Mass Flow Controller has been correctly installed and thoroughly leak tested as described in section (2). Shut the flow source OFF. Apply power to the unit via the 15-pin “D” connector. Before connecting the power supply check the controller power supply requirements label located on the controller back cover. If the power supply requirements label states that power supply requirement is 12 Vdc, do not connect the power supply with voltage above 15 Vdc. Exceeding the specified maximum power supply voltage limit will result in device permanent damage. Allow the Mass Flow Controller to warm-up for at least 15 minutes.

During initial powering of the GFC transducer, the flow output signal will be indicating a higher than usual output. This is indication that the GFC transducer has not yet attained its minimum operating temperature. This condition will automatically cancel within a few minutes and the transducer should eventually zero.

If after the 15 minutes warm-up period, the display still indicates a reading of less than ± 3.0 % of F.S., readjust the ZERO potentiometer [R34] through the access window. Before zero adjustment temporarily disconnect the gas source, to ensure that no seepage or leak occurs in to the meter.

TABLE IV PRESSURE DROPS

MODEL

FLOW RATE

[liters/min]

MAXIMUM PRESSURE DROP

[mm H2O]

[psid] [mbar]

GFC 17 UP to 10 720 1.06 75

GFC 37

15 2630 3.87 266 20 1360 2.00 138

30 2380 3.50 241 40 3740 5.50 379

50 5440 8.00 551

GFC 47

60 7480 11.00 758

100 12850 18.89 1302

GFC 57 200 7031 10.00 690 GFC 67 500 8437 12.00 827

GFC 77 1000 10547 15.00 1034

CAUTION: Adjusting Zero Reading more than ± 3.0% F.S. from the factory settings may affect device calibration accuracy. If such adjustment is required it is recommended to perform controller recalibration to pre serve device accuracy.

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