Aalborg GFM User Manual

Technical Data Sheet No. TD9411M Rev. L Date of Issue: April 2013
OPERATING MANUAL
GFM MASS
FLOW METERS
CAUTION:
This product is not intended to be used in life support applications!
TABLE OF CONTENTS
1.1 Inspect Package for External Damage.................................................
1.2 Unpack the Mass Flow Meter...............................................................
1.3 Returning Merchandise for Repair.......................................................
2. INSTALLATION........................................................................................
2.1 Primary Gas Connections.................................................................
2.2 Electrical Connections......................................................................
2.3.1 Remote LCD Readouts.....................................................................
2.3.2 Panel Mounting Readouts................................................................
3. PRINCIPLE OF OPERATION...................................................................
4. SPECIFICATIONS...................................................................................
4.1 CE Compliance.................................................................................
5. OPERATING INSTRUCTIONS..................................................................
5.1 Preparation and Warm Up..................................................................
5.2 Flow Signal Output Readings..........................................................
5.3 Swamping Condition.......................................................................
6. MAINTENANCE.........................................................................................
6.1 Introduction......................................................................................
6.2 Flow Path Cleaning...........................................................................
6.2.1 Restrictor Flow Element (RFE)........................................................
6.2.2 GFM 17 models................................................................................
7. CALIBRATION PROCEDURES.................................................................
7.1 Flow Calibration...............................................................................
7.2 Calibration of GM Mass Flow Meters..............................................
7.2.1 Connections and Initial Warm Up.....................................................
7.2.2 ZERO Adjustment.............................................................................
7.2.3 SPAN Adjustment............................................................................
7.3 Linearity Adjustment..........................................................................
7.3.1 Connections and Initial Warm Up....................................................
7.3.2 ZERO Adjustment.............................................................................
7.3.3 25% Flow Adjustment......................................................................
7.3.4 50% Flow Adjustment......................................................................
7.3.5 75% Flow Adjustment......................................................................
1 1 1 1
1 1 2 4 4
5
6 7
9 9 9
10
10 10 10 10 11
11 11 13 13 13 13 14 14 14 14 15 15
7.3.6 50% Flow Adjustment....................................................................
7.3.7 75% Flow Adjustment....................................................................
7.3.8 100% 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......................................................................
8. TROUBLESHOOTING.............................................................................
8.1 Common Conditions........................................................................
8.2 Troubleshooting Guide.....................................................................
8.3 Technical Assistance.......................................................................
9. CALIBRATION CONVERSIONS FROM REFERENCE GASES.......................
APPENDIX 1 COMPONENT DIAGRAM.........................................................
APPENDIX 2 GAS FACTOR TABLE ("K" FACTORS)........................................
APPENDIX 3 DIMENSIONAL DRAWINGS......................................................
PARTS OF THE FLOW METER..............................................
APPENDIX 4 WARRANTY..............................................................................
15 15 15 15 16 16 16
16 16 17 21
22
23
24
28 29
30
1. UNPACKING THE GFM MASS FLOW METER
1.1 Inspect Package for External Damage
Your GFM Mass Flow Meter 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 Meter
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 Meter directly, and request a Return
Authorization Number (RAN). Equipment returned without an RAN will not be accepted. Aalborg7 reserves the right to charge a fee to the customer for
equipment returned under warranty claims if the instruments are tested to be free from warrantied defects.
Shipping charges are borne by the customer. Meters 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.
2. INSTALLATION
2.1 Primary Gas Connections
Please note that the GFM Mass Flow Meter will not operate with liquids. Only clean gases are allowed to be introduced into the instrument. If gases are contaminated they must be filtered to prevent the introduction of impediments into the sensor.
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CAUTION: Some of the IC devices used in the GFM are Electro Static Discharge (ESD) sensitive and may be damaged by improper handling. When wiring 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 9 pins interface D-connector is not used do not remove factory installed ESD protection cover.
2
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. AALBORG IS NOT LIABLE FOR ANY DAMAGE OR PERSONAL INJURY, WHATSOEVER, RESULTING FROM THE USE OF THIS INSTRUMENT FOR OXYGEN GAS.
For more information contact your distributor or Aalborg7.
Attitude limit of the Mass Flow Meter is ±15Ffrom calibration position (standard cal­ibration is in horizontal position). This means that the gas flow path of the Flow Meter must be within this limit in order to maintain the original calibration accuracy. Should there be need for a different orientation of the meter, re-calibration may be neces­sary. It is also preferable to install the GFM 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 contaminant’s.
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 (except GFM77) 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)!
Using a Helium Leak Detector or other equivalent method perform a thorough leak test of the entire system
. (All GFM's are checked prior to shipment for leakage
within stated limits. See specifications in this manual.)
2.2 Electrical Connections
All GFM models require power supplies with nominal current rating of at least 200 mA. The operating power input is supplied via the DC power jack or the 9­pin “D” connector located at the side of the flow transducer enclosure. On GFM's pur-chased without an LCD readout, a readout panel meter, digital multimeter, or other equivalent device is required to observe the flow signal.
CAUTION: Some of the IC devices used in the GFM are Electro Static Discharge (ESD) sensitive and may be damaged by improper handling. When wiring 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 9 pins interface D-connector is not used do not remove factory installed ESD protection cover.
CAUTION: WIRING THE GFM METER WITH THE POWER ON MAY RESULT IN INTERNAL DAMAGE! PLEASE MAKE ALL WIRING CONNECTIONS BEFORE SWITCHING ON THE POWER.
3
Based on the GFM transducer’s serial number it may require a different power sup-ply voltage. GFM flow meters with serial numbers below 340621-1 may require 12 or 24 Vdc power supplies. Before connecting power supply check the meter power supply requirements label located on the flow meter back cover. If the power supply requirements label states that the power supply requirement 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 GFM flow meters with serial numbers above 340621-1 have universal power input and can be used with any power supply voltage between +12 and +26 Vdc.
CAUTION: BEFORE CONNECTING POWER SUPPLY CHECK YOUR METER SERIAL NUMBER AND POWER SUPPLY REQUREMENTS LABEL LOCATED ON THE FLOW METER BACK COVER. DO NOT CONNECT 24Vdc POWER SUPPLY UNLESS YOUR GFM METER WAS ORDERED AND CONFIGURED FOR 24Vdc. EXCEEDING SPECIFIED MAXIMUM POWER SUPPLY VOLTAGE LIMIT MAY RESULT IN DEVICE PERMANENT DAMAGE.
PIN FUNCTION
1 Remote LCD display signal 2 0 to 5 VDC output indication 3 0 to 5 VDC common 4 Power supply, positive 5 Power supply, common 6 Remote LCD display reference 7 (unassigned) 8 4 to 20 mA output indication
self-powered (sourcing type, non-isolated)
9 4 to 20 mA common (return)
FIGURE 2.a - 9-PIN “D” CONNECTOR PINOUTS FOR GFM TRANSDUCER.
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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.
Make sure power is OFF when connecting or disconnecting any cables in the system.
When connecting power to the GFM mass flow meter via the DC power jack, do not connect any power supply to the 9-pin 'D' Connector. The DC power jack has a center positive polarity.
When battery use is required to power the GFM, use only the optional battery and accompanying charger available from Aalborg7.
Based on the device serial number the power input is protected by a 750mA (12 and 24 Vdc flow meter models with serial numbers below 340621-1) or 300 mA (universal power flow meter models with serial numbers above 340621-1) 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 faulty condition has been removed.
CAUTION: Resettable fuse will not protect meter if power supply voltage exceeds maximum voltage specified for particular model.
In order to operate flow meter within the specification the cable length for analog 0-5 Vdc output and remote LCD display may not exceed 9.5 feet (3 meters).
Use of the GFM 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.
2.3.1 Remote LCD Readouts
GFM Mass Flow Meters 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.
2.3.2 Panel Mounting Readouts
Another option for the GFM Mass Flow Meter 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.b).
FIGURE 2.b - 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 the flow rates of a gas in the two laminar flow conduits are proportional 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 by the electronic control circuit. 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.
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4. SPECIFICATIONS
FLOW MEDIUM: Please note that GFM17/37/47/57/67/77 Mass Flow Meters are designed to work with clean gases only. Never try to meter or control flow rates of liquids with any GFM's.
CALIBRATIONS: Performed at standard conditions [14.7 psia (1.01 bars) and 70
F
F
(21.1
F
C)] unless otherwise requested or stated.
ENVIRONMENTAL (per IEC 664): Installation Level II; Pollution Degree II.
ACCURACY: ±1.5% F.S. (optional enhanced accuracy ±1% F.S.).
REPEATABILITY: ±0.25% of full scale.
TEMPERATURE COEFFICIENT: 0.15% of full scale/
F
C.
PRESSURE COEFFICIENT: 0.01% of full scale/psi (0.07 bar).
RESPONSE TIME: 800 ms time constant; approximately 2 seconds to within ±2% of set
flow rate for 25% to 100% of full scale flow rate.
GAS PRESSURE: 1000 psig (69 bars) GFM 17, 37 and 47; 500 psig (34.5 bars) GFM 57, 67 and 77; optimum pressure is 20 psig (1.4 bars).
GAS AND AMBIENT TEMPERATURE: 32
F
F to 122 FF (0 FC to 50 FC).
14
F
F to 122 FF (-10 FC to 50 FC) - Dry gases only.
RELATIVE GAS HUMIDITY: Up to 70%.
LEAK INTEGRITY: 1 x 10
- 7
sccs He max. to the outside environment.
ATTITUDE SENSITIVITY: Incremental deviation of up to 1% full scale from stated accura­cy, after re-zeroing.
OUTPUT SIGNALS: Linear 0-5 VDC (1000 Ω minimum load impedance) and 4-20 mA self-powered sourcing type, non-isolated (0-500 loop Ω resistance); 20 mV peak to peak max noise.
Contact your distributor or Aalborg7for optional RS232 or RS-485 interfaces.
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TRANSDUCER INPUT POWER:
GFM models with 12 VDC power input (serial numbers below 340621-1):
12 VDC, 200 mA maximum;
GFM models with 24 VDC power input (serial numbers below 340621-1):
+24 VDC, 200 mA maximum;
GFM models with universal power input (serial numbers above 340621-1):
any voltage between +12 and +26 VDC, 200 mA maximum;
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Power input is protected by a 750 mA (GFM models with serial numbers below 340621-1) or 300 mA (GFM models with serial numbers above 340621-1) M (medium time-lag) reset­table fuse, and a rectifier diode for polarity protection.
WETTED MATERIALS:
GFM17/37/47/57/67/77: Anodized aluminum, brass, and 316 stainless steel with
VITON7 O-rings seals; BUNA7, EPR or KALREZ7 O-rings are optional.
GFM17S/37S/47S/57S/67S/77S: 316 stainless steel with VITON7 O-rings seals; BUNA7, EPR or KALREZ7 O-rings are optional.
Aalborg7makes 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.
INLET AND OUTLET CONNECTIONS:
GFM 17 and 37: 1/4" compression fittings. Optional: 6mm compression, 1/4" VCR7 ,
3/8" or 1/8" compression fittings (GFM 17).
GFM 47: 3/8" compression fittings. GFM 57: 3/8" compression fittings. GFM 67: 1/2" compression fittings. GFM 77: 3/4" FNPT fittings or 3/4" compression fittings.
LCD DISPLAY: 3½ digit LCD (maximum viewable digits “1999”), 0.5 inch high characters.
On GFM171/371/471/571/671/771 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 GFM transducer 9-pin “D” connector. In order to operate flow meter within the specification the cable length for analog 0-5 Vdc output and remote LCD display may not exceed 9.5 feet (3 meters).
4.1 CE Compliance
Any model GFM bearing a CE marking on it, is in compliance with the below stat­ed test standards currently accepted.
EMC Compliance with 89/336/EEC as amended; Emission Standard: EN 55011:1991, Group 1, Class B Immunity Standard: EN 55082-2:1992.
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TABLE II GFM 37
MEDIUM FLOW
MASS FLOW METER*
TABLE III GFM 47
HIGH FLOW
MASS FLOW METER*
* Flow rates are stated for Nitrogen at STP
conditions [i.e. 70
F
F (21.1 FC) at 1 atm].
For other gases use the K factor as a multiplier from APPENDIX 2.
TABLE IV PRESSURE DROPS
CODE
L/min [N2]
11
0 to 15 30 20 31 30
32 40 33 50
CODE
L/min [N2]
40 60 41 80
42 100 50 200 60 500 70 1000
MODEL
FLOW RATE
[L/min]
MAXIMUM PRESSURE DROP
[mm H2O]
[psid] [mbar]
GFM 17 up to 10 25 0.04 2.5
GFM 37
15 63 0.09 6.4 20 300 0.44 30 30 800 1.18 81 40 1480 2.18 150 50 2200 3.23 223
GFM 47
60 3100 4.56 314
100 5500 8.08 557 GFM 57 200 2720 4.0 280 GFM 67 500 3400 5.0 340 GFM 77 1000 6120 9.0 620
TABLE I GFM 17
LOW FLOW
MASS FLOW METER*
FLOW RANGES
CODE
mL/min [N2]
01 0 to 10 02 0 to 20
03 0 to 50 04 0 to 100 05 0 to 200 06 0 to 500
CODE
L/min [N2]
07 0 to 1
08 0 to 2
09 0 to 5
10 0 to 10
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5. OPERATING INSTRUCTIONS
5.1 Preparation and Warm Up
It is assumed that the Mass Flow Meter has been correctly installed and thor­oughly leak tested as described in section 2. Make sure the flow source is OFF. Apply power to the unit by plugging the power supply line into the DC power jack (or 9-pin 'D' connector) on the side of the meter. Allow the Mass Flow Meter to warm-up for a minimum of 15 minutes.
SUPPLYING DC POWER TO THE POWER JACK AND THE “D” CONNECTOR AT THE SAME TIME WILL DAMAGE THE METER. DC POWER JACK POLARITY IS CENTER POSITIVE.
During initial powering of the GFM transducer, the flow output signal will be indi­cating a higher than usual output. This is indication that the GFM transducer has not yet attained it's 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 hole. Before zero adjustment it is good practice to temporarily disconnect the gas source, to ensure that no seepage or leak occurs in to the meter.
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 METER RECALIBRATION TO PRESERVE DEVICE ACCURACY.
5.2 Flow Signal Output Readings
Initiate a controlled gas flow after warm up. The flow signal output can be viewed either on the LCD display, remote panel meter, digital multimeter, or other display device.
If an LCD display has been supplied with the GFM, the observed reading is in direct engineering units (0 to 100% indication is optional).
Analog output flow signals of 0 to 5 VDC and 4 to 20 mA are attained at the appro­priate pins of the 9-pin “D” connector (see Figure 2.a) on the side of the GFM trans­ducer.
Meter signal output is linearly proportional to the mass molecular flow rate of the gas being metered. By default calibration is done against 0 to 5 VDC output sig­nal. If 4-20 mA output signal is used for flow indication on the GFM, which was calibrated against 0 to 5 VDC, the total uncertainty of the reading may be in the range of +
2.5% of full scale. Optional calibration for 4-20 mA output signal is available upon request at time of order. The full scale range and gas for which your meter has been calibrated are shown on the flow transducers front label.
For optional RS232 interfaces please contact your distributor or Aalborg7.
5.3 Swamping Condition
If a flow of more than 10% above the maximum flow rate of the Mass Flow Meter is taking place, a condition known as “swamping” may occur. Readings of a “swamped” meter cannot be assumed to be either accurate or linear. Flow must be restored to below 110% of maximum meter range. Once flow rates are lowered to within calibrated range, the swamping condition will end. Operation of the meter above 110% of maximum calibrated flow may increase recovery time.
6. MAINTENANCE
6.1 Introduction
It is important that the Mass Flow Meter/Controller is used with clean, filtered gases only. Liquids may not be metered. Since the RTD sensor consists, in part, of a small capillary stainless steel tube, it is prone to occlusion due to impedi­ments or gas crystallization. Other flow passages are also easily obstructed. Therefore, great care must be exercised to avoid the introduction of any potential flow impediment. To protect the instrument a 50 micron (GFM17) or 60 micron (GFM37/47) filter is built into the inlet of the flow transducer. The filter screen and the flow paths may require occasional cleaning as described below. There is no other recommended maintenance required. It is good practice, however, to keep the meter away from vibration, hot or corrosive environments and excessive RF or magnetic interference.
If periodic calibrations are required they should be performed by qualified per­sonnel and calibrating instruments, as described in section 7. It is recommended that units are returned to Aalborg7 for repair service and calibration.
CAUTION: TO PROTECT SERVICING PERSONNEL IT IS MANDATORY THAT ANY INSTRUMENT BEING SERVICED IS COMPLETELY PURGED AND NEUTRALIZED OF TOXIC, BACTERIOLOGICALLY INFECTED, CORROSIVE OR RADIOACTIVE CONTENTS.
6.2 Flow Path Cleaning
Before attempting any disassembly of the unit for cleaning, try inspecting the flow paths by looking into the inlet and outlet ends of the meter for any debris that may be clogging the flow through the meter. Remove debris as necessary. If the flow path is not unclogged, then proceed with steps below.
Do not attempt to disassemble the sensor. If blockage of the sensor tube is not alle­viated by flushing through with cleaning fluids, please return meter for servicing.
DISASSEMBLY MAY COMPROMISE CURRENT CALIBRATION.
6.2.1 Restrictor Flow Element (RFE)
The Restrictor Flow Element (RFE) is a precision flow divider inside the trans­ducer, which splits the inlet gas flow by a preset amount to the sensor and main flow paths. The particular RFE used in a given Mass Flow Meter depends on the gas and flow range of the instrument.
10
11
6.2.2 GFM 17 models
Unscrew the inlet compression fitting of meter. Note that the Restrictor Flow Element (RFE) is connected to the inlet fitting.
Carefully disassemble the RFE from the inlet connection. The 50 micron filter screen will now become visible. Push the screen out through the inlet fitting. Clean or replace each of the removed parts as necessary. If alcohol is used for clean­ing, allow time for drying.
Inspect the flow path inside the transducer for any visible signs of contaminant. If necessary, flush the flow path through with alcohol. Thoroughly dry the flow paths by flowing clean dry gas through.
Carefully re-install the RFE and inlet fitting, avoiding any twisting and deforming the RFE. Be sure that no dust has collected on the O-ring seal.
NOTE: OVER TIGHTENING WILL DEFORM AND RENDER THE RFE DEFECTIVE.
it is advisable that at least one calibration point be checked after re-installing the inlet fitting-see section (7).
7. CALIBRATION PROCEDURES
NOTE: REMOVAL OF THE FACTORY INSTALLED CALIBRATION SEALS AND/OR ANY ADJUSTMENTS MADE TO THE METER, AS DESCRIBED IN THIS SECTION, WILL VOID ANY CALIBRATION WARRANTY APPLICABLE.
7.1 Flow Calibration
Aalborg7 Instruments' Flow Calibration Laboratory offers professional calibration support for Mass Flow Meters, using precision calibrators under strictly controlled conditions. NIST traceable calibrations are available. Calibrations can also be per­formed at customers' site using available standards.
Factory calibrations are performed using NIST traceable precision volumetric calibrators incorporating liquid sealed frictionless actuators. Generally, calibra­tions are performed using dry nitrogen gas.
,
,
IT IS NOT RECOMMENDED TO ATTEMPT TO DISASSEMBLE, OR REPAIR GFM37, GFM47, GFM57, GFM67 AND GFM77 MODELS. DISASSEMBLY NECESSITATES RE-CALIBRATION.
12
The calibration can then be corrected to the appropriate gas desired based on relative correction [K] factors shown in the gas factor table - see Appendix 2. A reference gas, other than nitrogen, may be used to better approximate the flow characteristics of certain gases. This practice is recommended when a reference gas is found with thermodynamic properties similar to the actual gas under con­sideration. The appropriate relative correction factor should be recalculated - see section 9.
It is standard practice to calibrate Mass Flow Meters with dry nitrogen gas at 70
0
F (21.1 FC), 20 psig (1.4 bars) inlet pressure and 0 psig (0 bar) outlet pressure. It is best to calibrate the GFM transducers to actual operating conditions. Specific gas calibrations of non-toxic and non-corrosive gases are available at specific
conditions. Please contact your distributor or Aalborg7 for a price quotation. It is recommended that a flow calibrator of at least four times better collective accu­racy than that of the Mass Flow Meter to be calibrated be used. Equipment required for calibration includes a flow calibration standard and a certified high sensitivity multimeter (which together have a collective accuracy of ±0.25% or better), an insulated (plastic) screwdriver, a flow regulator (example: metering needle valve) installed upstream from the Mass Flow Meter and a pressure reg­ulated source of dry filtered nitrogen gas (or other suitable reference gas).
The gas and ambient temperature, as well as inlet and outlet pressure conditions should be set up in accordance with actual operating conditions.
FIGURE 7.a - CALIBRATION POTENTIOMETER AND JUMPER LOCATIONS
R52-25%
(IF ENABLED)
R33-SPAN
(25% or 10%)
J1A (R52)
R1
J1B (R38) J1C (R39)
INCREASE
DECREASE
J1D (R40)
MODULAR JACK
D-CONNECTOR
R34-ZERO
POWER JACK
R38-50%
R39-75% R40-100%
7.2 Calibration of GFM Mass Flow Meters
All adjustments in this section are made from the outside of the meter, there is no need to disassemble any part of the instrument.
GFM Mass Flow Meters may be field recalibrated/checked for the same range they were originally factory calibrated for. When linearity adjustment is needed, or flow range changes are being made proceed to step 7.3. Flow range changes may require a different Restrictor Flow Element (RFE). Consult your distributor or Aalborg7 for more information.
7.2.1 Connections and Initial Warm Up
At the 9-pin “D” connector of the GFM transducer, connect the multimeter to out­put pins [2] and [3] for 0-5 VDC (or pins [8] and [9] for 4-20 mA)-(see Figure 2.a).
Power up the Mass Flow Meter for at least 30 minutes prior to commencing the calibration procedure.
7.2.2 ZERO Adjustment
Shut off the flow of gas into the Mass Flow Meter. To ensure that no seepage or leak occurs into the meter, it is good practice to temporarily disconnect the gas source. Using the multimeter and the insulated screwdriver, adjust the ZERO potentiometer
[R34] through the access window for 0 VDC (or 4 mA respectively) at zero flow.
7.2.3 SPAN Adjustment
Reconnect the gas source. Using the flow regulator, adjust the flow rate to 100% of full scale flow. Check the flow rate indicated against the flow calibrator. If the devia­tion is less than ±10% of full scale reading, correct the SPAN potentiometer [R33] setting by using the insulated screwdriver through the access window, to eliminate any deviation. If the deviation is larger than ±10% of full scale reading, a defective condition may be present.
13
CAUTION: The minimum voltage on 0-5 Vdc output can be in the range of 7 to 25 mV. Trying to reduce voltage below this level may increase negative zero shift. This shift may be invisible on devices without LCD display. Stop R34 zero potentiometer adjustment if voltage on 0-5 Vdc output is in the range from 7 to 25 mV and does not decrease any lower.
LIKELY REASONS FOR A MALFUNCTIONING SIGNAL MAY BE:
Occluded or contaminated sensor tube.Leaking condition in the GFM transducer or the gas line and fittings.For gases other than nitrogen, recheck appropriate “K” factor from the Gas Factor Table.Temperature and/or pressure correction errors.
14
See also section 8. TROUBLESHOOTING. If after attempting to remedy the above conditions, a malfunction still persists, return the meter for factory service, see section 1.1.
At this point the calibration is complete. However, it is advisable that several addi­tional points between 0 and 100%, such as 25%, 50%, and 75% flow be checked. If discrepancies are found, proceed to step 7.3 for Linearity Adjustment.
7.3 Linearity Adjustment
7.3.1 Connections and Initial Warm Up
At the 9-pin “D” connector of the GFM transducer, connect the multimeter to out­put pins [2] and [3] for 0-5 VDC (or pins [8] and [9] for 4-20 mA)-(see Figure 2.a). If calibration to a new flow range or different gas is being performed, it may be necessary to remove any jumpers at J1.A, J1.B, J1.C, and J1.D before the begin­ning the linearizing procedure.
Power up the Mass Flow Meter for at least 30 minutes prior to commencing the calibration procedure.
7.3.2 ZERO Adjustment
Shut off the flow of gas into the Mass Flow Meter. To ensure that no seepage or leak occurs into the meter, it is good practice to temporarily disconnect the gas source. Using the multimeter and the insulated screwdriver, adjust the ZERO potentiometer [R34] through the access window for 0 VDC (or 4 mA respectively) at zero flow.
7.3.3 25% Flow Adjustment (using R33 potentiometer)
Reconnect the gas source. Using the flow regulator, adjust the flow rate to 25% of full scale flow. Check the flow rate indicated against the flow calibrator.
Adjust the setting for potentiometer [R33] by using the insulated screwdriver through the access window, until the output of the flow meter reads 1.25VDC ±63mV (or 8mA ±0.25mA).
Using the flow regulator, adjust the flow rate until the output of the flow meter reads 0.5 VDC (or 5.6mA). Check the flow rate against the flow calibrator. If the flow rate indicated by the calibrator is within 10% ± 1.5% of F.S. then skip para­graphs 7.3.4, 7.3.5 and proceed directly to paragraph 7.3.6, if not, perform 10% flow adjustment according to paragraph 7.3.4.
CAUTION: The minimum voltage on 0-5 Vdc output can be in the range of 7 to 25 mV. Trying to reduce voltage below this level may increase negative zero shift. This shift may be invisible on devices without LCD display. Stop R34 zero potentiometer adjustment if voltage on 0-5 Vdc output is in the range from 7 to 25 mV and does not decrease any lower.
7.3.4 10% Flow Adjustment
Using the flow regulator, adjust the flow rate to 10% of full scale flow according to the calibrator. Check the flow rate indicated against the flow calibrator. Adjust the setting for potentiometer [R33] by using the insulated screwdriver through the access win­dow, until the output of the flow meter reads 0.5VDC ±63mV (or 5.6mA ±0.25mA).
7.3.5 25% Flow Adjustment (using R52 potentiometer)
Using the flow regulator, adjust the flow rate to 25% of full scale flow according to the calibrator. Check the flow rate indicated against the flow calibrator. The output of the flow meter should read 1.25VDC ±63mV (or 8.0mA ±0.25mA). If the reading is outside of that range, place the jumper at [J1.A] as appropriate to increase or decrease the signal. Adjust the setting for potentiometer [R52] by using the insu­lated screwdriver through the access window, until reading is within specification.
7.3.6 50% Flow Adjustment
Using the flow regulator, increase the flow rate to 50% of full scale flow according to the calibrator. Check the flow rate indicated against the flow calibrator. The out­put of the flow meter should read 2.50VDC ±63mV (or 12mA ±0.25mA). If the read­ing is outside of that range, place the jumper at [J1.B] as appropriate to increase or decrease the signal. Adjust the setting for potentiometer [R38] by using the insu­lated screwdriver through the access window, until reading is within specification.
7.3.7 75% Flow Adjustment
Using the flow regulator, increase the flow rate to 75% of full scale flow according to calibrator. Check the flow rate indicated against the flow calibrator. The output of the flow meter should read 3.75VDC ±63mV (or 16mA ±0.25mA). If the reading is outside of that range, place the jumper at [J1.C] as appropriate to increase or decrease the signal. Adjust the setting for potentiometer [R39] by using the insu­lated screwdriver through the access window, until reading is within specification.
7.3.8 100% Flow Adjustment
Using the flow regulator, increase the flow rate to 100% of full scale flow accord­ing to calibrator. Check the flow rate indicated against the flow calibrator. The out­put of the flow meter should read 5.00VDC ±63mV (or 20mA ±0.25mA).
If the reading is outside of that range, place the jumper at [J1.D] as appropriate to increase or decrease the signal. Adjust the setting for potentiometer [R40] by using the insulated screwdriver through the access window, until reading is within specification.
Repeat steps 7.3.3 to 7.3.8 at least once more.
7.4 LCD Display Scaling
It may be desirable to re-scale the output reading on the LCD readout supplied with certain model GFM transducers. Re-calibration for a new flow range or dif­ferent engineering units are two examples of when this may be necessary.
15
16
7.4.1 Access LCD Display Circuit
Carefully remove the LCD from the GFM or panel mounted surface. Remove the aluminum housing on the side of the connection cable. Slide the LCD assembly out of the aluminum housing.
7.4.2 Adjust Scaling
Using a digital multimeter connected to either the 0 to 5 VDC or 4 to 20 mA sig­nal at the 9-pin “D” connector, set the flow rate on the GFM to full scale flow (5 VDC or 20mA). Maintain full scale flow, and adjust the potentiometer [R3] on the LCD printed circuit board to desired full scale flow reading.
7.4.3 Change Decimal Point
To change the decimal place on the LCD display readout, simply move the jumper to the appropriate location on the 8-pin header block. The numbers are printed to the side of the connections. Do not attempt to place more than one jumper for decimal setting.
JUMPER POSITION MAXIMUM SCALABLE DISPLAY READING
“0”
1999
“1”
199.9
“2”
19.99
“3”
1.999
8. TROUBLESHOOTING
8.1 Common Conditions
Your Mass Flow Meter was thoroughly checked at numerous quality control points during and after manufacturing and assembly operations. It was calibrated according to your desired flow and pressure conditions for a given gas or a mix­ture of gases.
It was carefully packed to prevent damage during shipment. Should you feel that the instrument is not functioning properly please check for the following common conditions first:
Are all cables connected correctly? Are there any leaks in the installation? Is the power supply correctly selected according to requirements? When several meters are used a power supply with appropriate current rating should be selected.
Were the connector pinouts matched properly? When interchanging with other manufacturers' equipment, cables and connectors must be carefully wired for cor­rect pin configurations. Is the pressure differential across the instrument sufficient?
17
8.2 Troubleshooting Guide
INDICATION
lack of reading or output
unstable or no zero reading
full scale output at “no flow” condition or with valve closed
calibration off
LIKELY REASON
power supply off
fuse blown
filter screen obstructed at inlet
occluded sensor tube
pc board defect
power supply problem
gas leak
pc board defective
defective sensor
gas leak
gas metered is not the same as what meter was calibrated for
composition of gas changed
gas leak
pc board defective
RFE dirty
occluded sensor tube
filter screen obstructed at inlet
transducer is not mounted properly
REMEDY
check connection of power supply
disconnect GFM transducer from power supply; remove the shorting condition or check polarities; fuse resets automatically
flush clean or disassemble to remove impediments or replace
flush clean or or return to factory for replacement
return to factory for replacement
check power supply for appropriate output
locate and correct
return to factory for replacement
return to factory for replacement
locate and correct
use matched calibration
see K factor tables in APPENDIX 2
locate and correct
return to factory for replacement
flush clean or disassemble to remove impediments
flush clean or return to factory for replacement
flush clean or disassemble to remove impediments or replace
check for any tilt or change in the mounting of the transducer; generally, units are calibrated for horizontal installation (relative to the sensor tube)
18
INDICATION
No zero reading after 15 minute warm up time and no flow condition.
No zero reading after 15 minute warm up time and no flow condition. Display reading does not response on zero adjustment.
No zero reading after 15 minute warm up time and no flow condition. Display reading does not response on zero adjustment. But analog output 0-5 Vdc can be adjusted from 10mV up to 0.5 Vdc with zero potentiometer R34.
LCD Display remains blank when unit is powered up. But flow can be observed on analog output 0-5 Vdc (pis 2 and 3 of the D-connector).
LCD Display remains blank when unit is powered up. No response on the flow from analog output 0-5 Vdc (voltage is less than 15 mV).
REMEDY
Readjust ZERO potentiometer R34 through the access hole (see page 13 for details).
Measure voltage on pins 4 and 5 of the 9 pin D-connector. If voltage is less than 11.0Vdc replace power supply with new one (regulated 12.0 Vdc, 250 mA minimum is recommended).
Carefully remove the LCD from GFM. Remove the alu­minum housing on the side of the connection cable. Side the LCD assembly out of the aluminum housing. Check connection for all four wires. If any wire is disconnected restore connection and read­just zero potentiometer R34 to get zero reading on the display (ensure gas source is disconnected and no seepage or leak occurs in to the meter).
Check LCD connector (remove and reinstall LCD connector)
See instructions for pos. 3
Measure voltage on pins 4 and 5 of the 9 pin D-connector. If voltage is less than 11.0Vdc replace power supply with new one (regulated 12.0 Vdc, 250 mA minimum is recommended). If polarity is reversed (reading is negative) make correct connection.
Return GFM to factory for repair.
LIKELY REASON
Embedded temperature has been changed.
Power supply voltage is less than 11.0 Vdc.
Wire is disconnected inside of the LCD Display.
LCD Display connector is not attached to the GFM or connection is loose.
Wire is disconnected inside of the LCD Display.
Power supply is bad or polarity is reversed.
PC board is defective.
19
INDICATION
LCD Display reading does not correspond the correct flow range according analog output 0-5 Vdc signal.
LCD Display reading and analog output 0-5Vdc signal are fluctuate in wide range during the flow measurement.
LCD Display reading does correspond the correct flow range, but 0-5 Vdc output signal does not change (always the same reading or around zero).
LCD Display reading and 0-5 Vdc output voltage do correspond the correct flow range, but 4-20 mA output signal does not change (always the same or reading around 4.0 mA).
Calibration is off (no more than 3.0 % F.S.).
REMEDY
Readjust LCD Display scaling for required full scale flow (see 7.4 on page 15).
Check external connections to pins 2 and 3 of the D-connector. Make sure the load resistance is more than 1000 Ohm.
Return GFM to factory for repair.
Check external connections to pins 8 and 9 of the D-connector. Make sure the loop resistance is less than 500 Ohm.
Return GFM to factory for repair.
Shut off the flow of gas into the GFM (ensure gas source is disconnected and no seepage or leak occurs in to the meter). Wait for 15 minute. with no flow condition and readjust zero potentiometer R34 to get zero reading on the display.
LIKELY REASON
LCD Display is adjusted for wrong flow range or engineering units.
Output 0-5 Vdc signal (pins 2 and 3 of the D-connector) is shorted on the GND or overloaded.
Output 0-5Vdc schematic is burned out or damaged.
External loop resistance is open or more than 500 Ohm.
Output 4-20 mA schematic is burned out or damaged.
GFM has initial zero shift.
20
INDICATION
LCD Display reading is above maximum flow range and output voltage 0-5 Vdc signal is more than 5.5 Vdc when gas flows through the GFM.
Gas flows through the GFM, but LCD Display reading and output voltage 0-5 Vdc signal do not responds on the flow.
Gas does not flow through the GFM with inlet pressure applied to the inlet fitting. LCD Display reading and output voltage 0-5 Vdc signal show zero flow.
Gas flows through the GFM, but LCD Display reading is negative and output voltage 0-5 Vdc signal do not responds on the flow (reading near 10mV).
Gas flows through the GFM, but LCD Display reading is negative and does not change according to gas flow. Output voltage 0-5 Vdc signal corresponds correct gas flow.
REMEDY
Lower the flow through GFM within calibrated range or shut down the flow com­pletely. The swamping con­dition will end automatically.
Return GFM to factory for repair.
Check maximum flow range on transducer's front panel and make required flow adjustment.
Unscrew the inlet compres­sion fitting of the meter and reinstall RFE (see 6.2.2 on page 11). NOTE: Calibration accuracy can be affected.
Return GFM to factory for repair.
Flush clean or disassemble to remove impediments or replace the filter screen (see 6.2 on page 10). NOTE: Calibration accuracy can be affected.
Check the direction of gas flow as indicated by the arrow on the front of the meter and make required reconnection in the installation.
Locate and correct gas leak in the system. If GFM has internal leak return it to factory for repair.
Carefully remove the LCD from GFM. Remove the aluminum housing on the side of the connection cable. Side the LCD assembly out of the aluminum housing. Check connection for green wire (5.00 Vdc reference voltage). If any wire is disconnected restore con­nection.
LIKELY REASON
Sensor under swamping conditions (flow is more than 10% above maximum flow rate for particular GFM).
PC board is defective.
The gas flow is too low for particular model of GFM.
GFM17 models: RFE is not connected properly to the inlet fitting.
Sensor or PC board is defective.
Filter screen obstructed at inlet.
Direction of the gas flow is reversed.
GFM is installed in the installation with back pres­sure conditions and gas leak exist in the system.
5.00 Vdc reference voltage (green wire) is disconnected inside of the LCD Display.
21
INDICATION
GFM is disconnected from the source of the gas (no flow conditions) but LCD Display reading is fluctuating in wide range. Output voltage 0-5 Vdc signal also fluctuating. The power supply voltage is 12 Vdc and stable.
Reading on the LCD Display ten (hundreds) times less or more than actual gas flow. Output voltage 0-5 Vdc signal corresponds correct gas flow.
REMEDY
Return GFM to factory for repair.
Carefully remove the LCD from GFM. Remove the aluminum housing on the side of the connection cable. Side the LCD assembly out of the aluminum housing. Reinstall jumper to the appropriate location on the 8-pin header block (see 7.4.3 on page 16).
LIKELY REASON
Sensor or PC board is defective.
Decimal point jumper is installed in wrong position on the LCD Display Circuit.
For best results it is recommended that instruments are returned to the factory for servicing. See section 1.3 for return procedures.
8.3 Technical Assistance
Aalborg7 Instruments will provide technical assistance over the phone to qualified repair personnel. Please call our Technical Assistance at 845-770-3000. Please have your Serial Number and Model Number ready when you call.
Q
O2
= Q
a
= Q
r
X K = 1000 X 0.9926 = 992.6 sccm
where K = relative K factor to reference gas (oxygen to nitrogen)
1
d X C
p
where d = gas density (gram/liter) C
p
= coefficient of specific heat (cal/gram)
Q
a
K
a
Q
r
K
r
where Qa= mass flow rate of an actual gas (sccm) Q
r
= mass flow rate of a reference gas (sccm)
K
a
= K factor of an actual gas
K
r
= K factor of a reference gas
22
=
9. CALIBRATION CONVERSIONS FROM
REFERENCE GASES
The calibration conversion incorporates the K factor. The K factor is derived from gas density and coefficient of specific heat. For diatomic gases:
=
K
=
K
gas
Note in the above relationship that d and Cp are usually chosen at the same con­ditions (standard, normal or other).
If the flow range of a Mass Flow Meter remains unchanged, a relative K factor is used to relate the calibration of the actual gas to the reference gas.
For example, if we want to know the flow rate of oxygen and wish to calibrate with nitrogen at 1000 SCCM, the flow rate of oxygen is:
23
APPENDIX 1
COMPONENTS DIAGRAM
GFM METERING PC BOARD
24
APPENDIX 2
GAS FACTOR TABLE (“K” FACTORS)
CAUTION: K-Factors at best are only an approximation. K factors should not
be used in applications that require accuracy better than +/- 5 to 10%.
ACTUAL GAS
K FACTOR
Relative to N
2
Cp
[Cal/g]
Density
[g/I]
Acetylene C2H
2
.5829 .4036 1.162 Air 1.0000 .240 1.293 Allene (Propadiene) C3H
4
.4346 .352 1.787 Ammonia NH
3
.7310 .492 .760 Argon Ar
Argon AR-1 (>10 L/min)
1.4573
1.205
.1244 .1244
1.782
1.782
Arsine AsH
3
.6735 .1167 3.478 Boron Trichloride BCl
3
.4089 .1279 5.227 Boron Trifluoride BF
3
.5082 .1778 3.025 Bromine Br
2
.8083 .0539 7.130 Boron Tribromide Br
3
.38 .0647 11.18 Bromine PentaTrifluoride BrF
5
.26 .1369 7.803 Bromine Trifluoride BrF
3
.3855 .1161 6.108 Bromotrifluoromethane (Freon-13 B1) CBrF
3
.3697 .1113 6.644
1,3-Butadiene C4H
6
.3224 .3514 2.413
Butane C4H
10
.2631 .4007 2.593
1-Butene C4H
8
.2994 .3648 2.503
2-Butene C4H8 CIS
.324 .336 2.503
2-Butene C4H8TRANS
.291 .374 2.503
Carbon Dioxide CO
2
Carbon Dioxide CO2-1 (>10 L/min)
.7382 .658
.2016 .2016
1.964
1.964
Carbon Disulfide CS
2
.6026 .1428 3.397
Carbon Monoxide C0
1.00 .2488 1.250
Carbon Tetrachloride CCl
4
.31 .1655 6.860
Carbon Tetrafluoride (Freon-14)CF
4
.42 .1654 3.926
Carbonyl Fluoride COF
2
.5428 .1710 2.945
Carbonyl Sulfide COS
.6606 .1651 2.680
Chlorine Cl
2
.86 .114 3.163
Chlorine Trifluoride ClF
3
.4016 .1650 4.125
Chlorodifluoromethane (Freon-22)CHClF
2
.4589 .1544 3.858
Chloroform CHCl
3
.3912 .1309 5.326
Chloropentafluoroethane(Freon-115)C2ClF
5
.2418 .164 6.892
Chlorotrifluromethane (Freon-13) CClF
3
.3834 .153 4.660
CyanogenC2N
2
.61 .2613 2.322
CyanogenChloride CICN
.6130 .1739 2.742
Cyclopropane C3H
5
.4584 .3177 1.877
ACTUAL GAS
K FACTOR
Relative to N
2
Cp
[Cal/g]
Density
[g/I]
Deuterium D
2
1.00 1.722 1.799
Diborane B2H
6
.4357 .508 1.235 Dibromodifluoromethane CBr2F
2
.1947 .15 9.362 Dichlorodifluoromethane (Freon-12) CCl2F
2
.3538 .1432 5.395 Dichlofluoromethane (Freon-21) CHCl2F
.4252 .140 4.592 Dichloromethylsilane (CH3)2SiCl
2
.2522 .1882 5.758 Dichlorosilane SiH2Cl
2
.4044 .150 4.506 Dichlorotetrafluoroethane (Freon-114) C2Cl2F
4
.2235 .1604 7.626 1,1-Difluoroethylene (Freon-1132A) C2H2F
2
.4271 .224 2.857 Dimethylamine (CH3)2NH
.3714 .366 2.011 Dimethyl Ether (CH3)2O
.3896 .3414 2.055 2,2-Dimethylpropane C3H
12
.2170 .3914 3.219 Ethane C2H
6
.50 .420 1.342 Ethanol C2H6O
.3918 .3395 2.055 Ethyl Acetylene C4H
6
.3225 .3513 2.413 Ethyl Chloride C2H5Cl
.3891 .244 2.879 Ethylene C2H
4
.60 .365 1.251 Ethylene Oxide C2H4O
.5191 .268 1.965 Fluorine F
2
.9784 .1873 1.695 Fluoroform (Freon-23) CHF
3
.4967 .176 3.127 Freon-11 CCl3F
.3287 .1357 6.129 Freon-12 CCl2F
2
.3538 .1432 5.395 Freon-13 CClF
3
.3834 .153 4.660 Freon-13B1 CBrF
3
.3697 .1113 6.644 Freon-14 CF
4
.4210 .1654 3.926 Freon-21 CHCl2F
.4252 .140 4.592 Freon-22 CHClF
2
.4589 .1544 3.858 Freon-113 CCl2FCClF
2
.2031 .161 8.360 Freon-114 C2Cl2F
4
.2240 .160 7.626 Freon-115 C2ClF
5
.2418 .164 6.892 Freon-C318 C4F
8
.1760 .185 8.397 Germane GeH
4
.5696 .1404 3.418 Germanium Tetrachloride GeCl
4
.2668 .1071 9.565
Helium He Helium He-1 (>50 L/min) Helium He-2 (>10-50 L/min)
1.454
2.43
2.05
1.241
1.241
1.241
.1786 .1786 .1786
Hexafluoroethane C2F6(Freon-116)
.2421 .1834 6.157 Hexane C6H
14
.1792 .3968 3.845 Hydrogen H2-1
Hydrogen H
2
-2 (>10-100 L)
Hydrogen H
2
-3 (>100 L)
1.0106
1.35
1.9
3.419
3.419
3.419
.0899 .0899 .0899
25
26
ACTUAL GAS
K FACTOR
Relative to N
2
Cp
[Cal/g]
Density
[g/I]
Hydrogen Bromide HBr
1.000 .0861 3.610
Hydrogen Chloride HCl
1.000 .1912 1.627
Hydrogen Cyanide HCN
.764 .3171 1.206
Hydrogen Fluoride HF
.9998 .3479 .893
Hydrogen Iodide HI
.9987 .0545 5.707
Hydrogen Selenide H2Se
.7893 .1025 3.613
Hydrogen Sulfide H2S
.80 .2397 1.520
Iodine Pentafluoride IF
5
.2492 .1108 9.90
Isobutane CH(CH3)
3
.27 .3872 3.593
Isobutylene C4H
6
.2951 .3701 2.503
Krypton Kr
1.453 .0593 3.739
Methane CH
4
Methane CH4-1 (>10 L/min)
.7175 .75
.5328 .5328
.715 .715
Methanol CH
3
.5843 .3274 1.429
Methyl Acetylene C3H
4
.4313 .3547 1.787
Methyl Bromide CH3Br
.5835 .1106 4.236
Methyl Chloride CH3Cl
.6299 .1926 2.253
Methyl Fluoride CH3F
.68 .3221 1.518
Methyl Mercaptan CH3SH
.5180 .2459 2.146
Methyl Trichlorosilane (CH3)SiCl
3
.2499 .164 6.669
Molybdenum Hexafluoride MoF
6
.2126 .1373 9.366
Monoethylamine C2H5NH
2
.3512 .387 2.011
Monomethylamine CH3NH
2
.51 .4343 1.386
Neon NE
1.46 .246 .900
Nitric Oxide NO
.990 .2328 1.339
Nitrogen N
2
1.000 .2485 1.25
Nitrogen Dioxide NO
2
.737 .1933 2.052
Nitrogen Trifluoride NF
3
.4802 .1797 3.168
Nitrosyl Chloride NOCl
.6134 .1632 2.920
Nitrous Oxide N2O
.7128 .2088 1.964
Octafluorocyclobutane (Freon-C318) C4F
8
.176 .185 8.397
Oxygen O
2
.9926 .2193 1.427
Oxygen Difluoride OF
2
.6337 .1917 2.406
Ozone
.446 .195 2.144
Pentaborane B5H
9
.2554 .38 2.816
Pentane C5H
12
.2134 .398 3.219
Perchloryl Fluoride ClO3F
.3950 .1514 4.571
Perfluoropropane C3F
8
.174 .197 8.388
Phosgene COCl
2
.4438 .1394 4.418
Phosphine PH
3
.759 .2374 1.517
27
ACTUAL GAS
K FACTOR
Relative to N
2
Cp
[Cal/g]
Density
[g/I]
Phosphorous Oxychloride POCl
3
.36 .1324 6.843
Phosphorous Pentafluoride PH
5
.3021 .1610 5.620
Phosphorous Trichloride PCl
3
.30 .1250 6.127
Propane C3H
8
.35 .399 1.967
Propylene C3H
6
.40 .366 1.877
Silane SiH
4
.5982 .3189 1.433
Silicon Tetrachloride SiCl
4
.284 .1270 7.580
Silicon Tetrafluoride SiF
4
.3482 .1691 4.643
Sulfur Dioxide SO
2
.69 .1488 2.858
Sulfur Hexafluoride SF
6
.2635 .1592 6.516
Sulfuryl Fluoride SO2F
2
.3883 .1543 4.562
Tetrafluoroethane (Forane 134A) CF3CH2F
.5096 .127 4.224
Tetrafluorohydrazine N2F
4
.3237 .182 4.64
Trichlorofluoromethane (Freon-11) CCl3F
.3287 .1357 6.129
Trichlorosilane SiHCl
3
.3278 .1380 6.043
1,1,2-Trichloro-1,2,2 Trifluoroethane (Freon-113) CCl
2
FCClF
2
.2031 .161 8.36
Triisobutyl Aluminum (C4H9)AL
.0608 .508 8.848
Titanium Tetrachloride TiCl
4
.2691 .120 8.465
Trichloro Ethylene C2HCl
3
.32 .163 5.95
Trimethylamine (CH3)3N
.2792 .3710 2.639
Tungsten Hexafluoride WF
6
.2541 .0810 13.28
Vinyl Bromide CH2CHBr
.4616 .1241 4.772
Vinyl Chloride CH2CHCl
.48 .12054 2.788
Xenon Xe
1.44 .0378 5.858
28
APPENDIX 3
DIMENSIONAL DRAWINGS
NOTES: Aalborg7 reserves the right to change designs and dimensions at its sole discretion at any
time without notice. For cer tified dimensions please contact Aalborg7.
MODEL
CONNECTION
Compression Fitting
(except model GFM 77)
DIMENSION (INCH)
LCD VERSION
NO
LCD
A B C/*C D/*D E/*E F G H
GFM 17
1/4" Tube O Diameter
5.60 1.00 1.00 3.00 5.02 0.69 2.69 4.50
GFM 37
1/4" Tube O Diameter
5.98 1.37 1.25 4.13 6.15 0.69 2.69 4.88
GFM 47
3/8" Tube O Diameter
5.98 1.37 1.25 4.13 6.27 0.69 2.69 4.88
GFM 57
3/8" Tube O Diameter
6.60 2.00 1.75 6.69 8.83
0.99
4.69 5.50
GFM 67
1/2" Tube O Diameter
7.60 3.00 3.00 7.25 9.67 2.250 6.750 6.50
GFM 77
3/4" NPT Female
8.60 4.00 4.00 7.30 - 3.000 6.800 7.50
2.38
0.95
FLOW
NO LCD
VERSION
A
H
B
* *
6-32
D E
D E
G
C
C
*
DASHED LINE FOR HIGH FLOW UNITS
F
29
PARTS OF THE FLOW METER
LEFT AND RIGHT VIEWS
FRONT VIEW
30
APPENDIX 4
NOTE: Follow Return Procedures In Section 1.3.
WARRANTY
Aalborg7 Mass Flow Systems are warranted against parts and workmanship for a period of one year from the date of purchase. Calibrations are warranted for up to six months after date of purchase, provided calibra­tion seals have not been tampered with. It is assumed that equipment select­ed by the customer is constructed of materials compatible with gases used. Proper selection is the responsibility of the customer. It is understood that gases under pressure present inherent hazards to the user and to equip­ment, and it is deemed the responsibility of the customer that only operators with basic knowledge of the equipment and its limitations are permitted to control and operate the equipment covered by this warranty. Anything to the
contrary will automatically void the liability of Aalborg7 and the provisions of this warranty. Defective products will be repaired or replaced solely at the
discretion of Aalborg7 at no charge. Shipping charges are borne by the cus­tomer. This warranty is void if the equipment is damaged by accident or mis-
use, or has been repaired or modified by anyone other than Aalborg7 or fac- tory authorized service facility. This warranty defines the obligation of
Aalborg7 and no other warranties expressed or implied are recognized.
TRADEMARKS
Aalborg®-is a registered trademark of Aalborg Instruments & Controls. Buna
®
-is a registered trademark of DuPont Dow Elastometers.
Kalrez
®
-is a registered trademark of DuPont Dow Elastomers.
Viton®-is a registered trademark of Dupont Dow Elastomers L.L.C.
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