Dwyer GFM4 User Manual

Series GFM3/4 Digital Mass Flow Meter

Installation and Operating Instructions

Bulletin F-GFM3/4

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

Phone: 219/879-8000 www.dwyer-inst.com

ABLE OF CONTENTS

. Unpacking the GFM3 Flow Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

.1 Inspect Package for External Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

1.2 Unpack the Mass Flow Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

1.3 Returning Merchandise for Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

.1 Primary Gas Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

.2 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

.2.1 Power Supply Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

2.2.2 Output Signal Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

2.2.3 Output Communication Parameters and Connections . . . . . . . . . . .1

. Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

5. Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

5.1 Preparation and Warm Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

5.2 Swamping Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

.3 Programming GFM3 using LCD and Keypad . . . . . . . . . . . . . . . . . . . . . . .1

.3.1 Changing Units of Measurement for Temperature &

ressure Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

5.3.2 Monitoring DFM Peripheries Settings . . . . . . . . . . . . . . . . . . . . . . . .1

5.3.3 GFM3 Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

5.3.4 Gas Flow Engineering Units Settings . . . . . . . . . . . . . . . . . . . . . . . .1

5.3.5 Gas Table Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

.3.6 Totalizer Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

.3.7 Alarm Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

.3.8 Relay Assignment Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

5.3.9 K-Factors Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

5.3.10 Zero Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

5.3.11 Flow Conditions Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

5.3.12 LCD Backlit Energy-Saving Setting . . . . . . . . . . . . . . . . . . . . . . . . .1

5.4 Flow, Temperature, Pressure Output Signals Configuration . . . . . . . . . . .1

. Calibration Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

.1 Flow Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

.2 Gas Flow Calibration of GFM3 Mass Flow Meters . . . . . . . . . . . . . . . . . .1

.2.1 Connections and Initial Warm Up . . . . . . . . . . . . . . . . . . . . . . . . . . .1

7.2.2 ZERO Check/Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

7.2.3 Gas Linearization Table Adjustment . . . . . . . . . . . . . . . . . . . . . . . . .1

7.3 Analog Output Calibration of GFM3 Mass Flow Meters . . . . . . . . . . . . . . .1

.3.1 Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

.3.2 Gas Flow 0 to 5 Vdc Analog Output Calibration . . . . . . . . . . . . . . . .1

.3.3 Gas Flow 4 to 20 mA Analog Output Calibration . . . . . . . . . . . . . . . .1

.3.4 Gas Temperature 0 to 5 Vdc Analog

Output Calibration (GFM3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

7.3.5 Gas Temperature 4 to 20 mA Analog

Output Calibration (GFM3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

.3.6 Gas Pressure 0 to 5 Vdc Analog

utput Calibration (GFM3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

.3.7 Gas pressure 4-20 mA Analog

Output Calibration (GFM3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

7.4 Temperature and/or Pressure Sensor Calibration . . . . . . . . . . . . . . . . . . .1

8. RS-485/RS-232 Software Interface Commands . . . . . . . . . . . . . . . . . . . . . . .1

.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

.2 Commands Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

.3 ASCII Commands Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

9. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

9.1 Common Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

9.2 Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

.3 Technical Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

0. Calibration Conversions from Reference Gases . . . . . . . . . . . . . . . . . . . .1

Appendix I GFM3 EEPROM Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Appendix II Internal User Selectable Gas Factor Table

(Internal “K” Factors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

6. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

6.2 Flow Path Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

6.2.1 Restrictor Flow Element (RFE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

6.2.2 GFM3 Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

6.2.3 GFM3 Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Appendix III Gas Factor Table (“K” Factors) . . . . . . . . . . . . . . . . . . . . . . .1

Appendix IV Component Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Appendix V Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Appendix VI Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Page 2

. UNPACKING THE GFM3/4 MASS FLOW METER

.1 - Inspect Package for External Damage

our GFM3/4 Mass Flow Meter was carefully packed in a sturdy cardboard carton,

Y 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.

.2 - Unpack the Mass Flow Meter

pen the carton carefully from the top and inspect for any sign of concealed

hipping damage. In addition to contacting the shipping carrier, please forward a

s copy of any damage report to your distributor or Dwyer Instruments, Inc

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

.3 - Maintenance/Repair

pon final installation of the Series GFM3/4, no routine maintenance is required.

U The Series GFM3/4 is not field serviceable and should be returned if repair is needed. Field repair should not be attempted and may void warranty.

Warranty/Return

efer to “Terms and Conditions of Sales” in our catalog and on our website. Contact

ustomer service to receive a Return Goods Authorization number before shipping

he product back for repair. Be sure to include a brief description of the problem

t plus any additional application notes

2. INSTALLATION

2.1 - Primary Gas Connections

lease note that the GFM3/4 Mass Flow Meter will not operate with liquids. Only

lean gases are allowed to be introduced into the instrument. If gases are

ontaminated they must be filtered to prevent the introduction of impediments into

c the sensor.

AUTION

application. For more information, contact your distributor or Dwyer

GFM3/4 transducers should not be used for monitoring OXYGEN gas unless specifically cleaned and prepared for such

Instruments,

Inc.

Attitude limit of Mass Flow Meter is ±15deg from 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 GFM3/4 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 tubing 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)!

WARNING

For models GFM4 (Multi Parameter versions) the maximum

pressure in the gas line should not exceed 100 PSIA (6.8 bars). Applying pressure above 100 PSIA (6.8 bars) for extended periods of time will seriously damage the pressure sensor and may cause serious injury or death. Burst pressure is 200 PSIA (13.6 bar)!

GFM3 transducers are supplied with standard 1/4˝ or 3/8˝, or optional 1/8˝ inlet and outlet compression fittings which 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 GFM3/4’s are checked prior to shipment for leakage within stated limits. See specifications in this manual.)

2.2 - Electrical Connections

GFM3/4 is supplied with a 25-pin "D" connector. Pin diagram is presented in figure b-

2.2.1 - Power Supply Connections

GFM3/4 transducers are supplied for three different power supply options:

±15Vdc (bipolar power supply)

DC Power (+) --------------- pin 1 of the 25-pin "D" connector DC Power Common --------------- pin 18 of the 25-pin "D" connector DC Power (-) --------------- pin 14 of the 25-pin "D" connector

12Vdc or +24Vdc (unipolar power supply)

CAUTION

dc! (See power requirements label at the rear of the GFM3/4 meter)

.2.2 - Output Signals Connections

C Power (+) --------------- pin 1 of the 25-pin "D" connector

C Power (-) --------------- pin 18 of the 25-pin "D" connector

O NOT CONNECT 24 Vdc POWER SUPPLY UNLESS YOUR

FM3/4 METER WAS ORDERED AND CONFIGURED FOR 24

AUTION

When connecting the load to the output terminals, do not exceed the rated values shown in the specifications. Failure to

do so might cause damage to this device. Be sure to check that the wiring and

he polarity of the power supply is correct before turning the power ON. Wiring

rror may cause damage or faulty operation.

FM3/4 Mass Flow Meters are equipped with either calibrated 0 to 5 VDC (0 to 10

DC optional) or calibrated 4 to 20 mA output signals (jumper selectable). This

inear output signal represents 0 to 100% of the flow meter's full-scale range. Multi

l Parameter versions (GFM3/4) are in addition equipped with either a calibrated 0 to 5 VDC (0 to 10 VDC optional) or a calibrated 4 to 20 mA output signal (jumper selectable) for pressure and temperature. Pressure linear output signal represents 0 to 100 PSIA (46.9 kPa). Temperature linear output signal represents 0 to 50

CAUTION

utput signals!

All 4 to 20 mA current loop outputs are self-powered (non-

solated). Do not connect an external voltage source to the

Flow 0 to 5 VDC or 4 to 20 mA output signal connection:

Plus (+) ------------------- pin 2 of the 25-pin "D" connector Minus (-) ------------------- pin 15 of the 25-pin "D" connector

emperature 0 to 5 VDC or 4 to 20 mA output signal connection

lus (+) -------------------- pin 3 of the 25-pin "D" connector

P Minus (-) -------------------- pin 16 of the 25-pin "D" connector

Pressure 0 to 5 VDC or 4 to 20 mA output signal connection

Plus (+) -------------------- pin 4 of the 25-pin "D" connector Minus (-) -------------------- pin 17 of the 25-pin "D" connector

To eliminate the possibility of noise interference, use a separate cable entry for the DC power and signal lines.

2.2.3 - Communication Parameters and Connections

The digital interface operates via RS485 (optional RS-232 is available), and provides access to applicable internal data including: flow, temperature, pressure reading, auto zero, totalizer and alarm settings, gas table, conversion factors and engineering units selection, dynamic response compensation and linearization table adjustment.

Communication Settings:

Baud rate: -------- 9600 baud Stop bit: -------- 1 Data bits: -------- 8 Parity: -------- None Flow Control: -------- None

RS-485 Communication Interface Connection:

The RS485 converter/adapter has to be configured for: multidrop, 2-wire, half duplex mode. The transmitter circuit has to be enabled by TD or RTS (depending on which is available on the converter/adapter). Settings for the receiver circuit usually should follow the selection made for the transmitter circuit in order to eliminate echo.

RS-485 T(-) or R(-) -------- pin 11 of the 25-pin "D" connector (-) RS-485 T(+) or R(+) -------- pin 24 of the 25-pin "D" connector (+) RS-485 GND (if available) -------- pin 20 of the 25-pin "D" connector (GND)

RS-232 Communication Interface Connection:

Crossover connection has to be established:

RS-232 RX (pin 2 on the DB9 connector) -------- pin 11 of the 25-pin "D" connector (TX) RS-232 TX (pin 3 on the DB9 connector) -------- pin 24 of the 25-pin "D" connector (RX) RS-232 GND (pin 5 on the DB9 connector) -------- pin 20 of the 25-pin "D" connector (GND)

Page 3

IN FUNCTION

+15 Vdc (Optional +12 or +24 Vdc) Power Supply

0 to 5 Vdc or 4 to 20 mA Flow Signal Output

2 3 0 to 5 Vdc or 4 to 20 mA Temperature Signal

Output (Optional)

4 0 to 5 Vdc or 4 to 20 mA Pressure Signal

utput (Optional)

(reserved)

7 8 Relay No. 1 - Common Contact 9 Relay No. 1 - Normally Open Contact 10 Relay No. 2 - Normally Closed Contact

1 RS485 (-) (Optional RS232 TX)

2 (No Connection)

3 Common

1 14 -15 VDC Power Supply (Only for ±15Vdc option) 15 Common, Signal Ground For Pin 2

(4 to 20 mA return)

16 Common, Signal Ground For Pin 3

4 to 20 mA return)

(

7 Common, Signal Ground For Pin 4

4 to 20 mA return)

(

18 Common, Power Supply (- DC power for

12 and 24 Vdc) 19 Common 20 RS232 Signal GND (RS-485 GND Optional)

1 Relay No. 1 - Normally Closed Contact

2 Relay No. 2 - Common Contact

3 Relay No. 2 - Normally Open Contact

2 24 RS485 (+) (Optional RS232 RX) 25 Chassis Ground

NOTICE

In general, "D" Connector numbering patterns are

Figure b-1, GFM3/4 Pin "D"

onnector Configuration

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 then particular numbers displayed on the mating connector.

NOTICE

Make sure power is OFF when connecting or disconnecting

any cables in the system.

The (+) and (-) power inputs are each protected by a 400 mA 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. DC Power cable length may not exceed 9.5´ (3 meters).

he flow rate can be displayed in volumetric flow or mass flow engineering units for

tandard or actual (temperature, pressure) conditions. Flow meters can be

rogrammed locally via the four button keypad and LCD, or remotely, via the RS-

32/RS-485 interface. GFM3/4 flow meters support various functions including:

2 flow totalizer, flow, temperature, pressure alarms, automatic zero adjustment, 2 SPDT relays output, 0 to 5 Vdc / 0 to 10 Vdc / 4 to 20 mA analog outputs for flow, pressure and temperature.

. SPECIFICATIONS

FM3

ervice: Clean gases compatible with wetted parts.

S Wetted Materials: 316 SS, 416 SS; Fluoroelastomer, Buna-N, EPR or PTFE O-

rings.

Accuracy: ±1% FS.

epeatability: ±0.25% FS.

esponse Time: 0.6 to 1.0 s to within ±2% of setpoint over 20 to 100% FS.

utput Signal: Linear 0 to 5 VDC (3000 Ω min. load impedance); 0 to 10 VDC

(6000 Ω min. load impedance); 4 to 20 mA (500 Ω max. loop resistance).

Max. Particulate Size: 5 microns. Temperature Limits: Ambient: 32 to 122°F (0 to 50°C); Dry Gases: 14 to 122°F (-

10 to 50°C).

ower Supply: ±12 VDC; ±15 VDC; ±24 VDC.

rocess Connections: 1/8˝ compression fitting for flow rates ≤ 10 L/min; 1/4˝ for ≤

0 L/min; 3/8˝ for ≤ 100 L/min.

Pressure Limits: 500 psi (35 bar). Leak Integrity: 1 x 10

-9

smL/sec of helium.

Display: 128 x 64 graphic LCD with backlight.

FM4

ervice: Clean gases compatible with wetted parts.

etted Materials: 316 SS, 416 SS; Fluoroelastomer, Buna-N, EPR or PTFE O-

rings.

Accuracy: ±1% FS. Repeatability: ±0.25% FS. Response Time: 0.6 to 1.0 s to within ±2% of setpoint over 20 to 100% FS. Output Signal: Linear 0 to 5 VDC (3000 Ω min. load impedance); 0 to 10 VDC

(6000 Ω min. load impedance); 4 to 20 mA (500 Ω max. loop resistance).

Max. Particulate Size: 5 microns. Temperature Limits: Ambient: 32 to 122°F (0 to 50°C); Dry Gases: 14 to 122°F (-

10 to 50°C).

Power Supply: ±12 VDC; ±15 VDC; ±24 VDC. Process Connections: 1/8˝ compression fitting for flow rates ≤ 10 L/min; 1/4˝ for ≤

50 L/min; 3/8˝ for ≤ 100 L/min.

Pressure Limits: 200 psia (13.79 barA). Leak Integrity: 1 x 10

-9

smL/sec of helium.

Display: 128 x 64 graphic LCD with backlight.

Use of the GFM3/4 flow transducer in a manner other than that specified in this manual or in writing from Dwyer

Instruments, Inc, may impair the protection

provided by the equipment.

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. Additionally, the GFM3/4 model Mass Flow Meter incorporates a Digital Signal Processor (DSP) and nonvolatile memory that stores all hardware specific variables and up to 10 different calibration tables. Multi parameter flow meters provide accurate data on three different fluid parameters:

• flow

• pressure

• temperature

Page 4

Flow rates are stated for Nitrogen at STP conditions [i.e. 70°F (21.1°C) at 1

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

low Rate

odel

std liters/min)

( GFM3/4-X-010 GFM3/4-X-050 GFM3/4-X-100

. OPERATING INSTRUCTIONS

p to 10

100

able IV - Pressure Drops

aximum Pressure Drop

(mm H

(psid)

0.04

200

500

.23

.08

(kPa)

0.276

2.3

5.7

5.1 - Preparation and Warm Up

It is assumed that the Digital Mass Flow Meter has been correctly installed and

horoughly leak tested as described in section 2. Make sure the flow source is OFF.

hen applying power to a flow meter, within the first two seconds you will see on

he LCD display: the product name, the software version, and revision of the

t EEPROM table. After two seconds the LSD display switches to the main screen with the following information:

• Temperature and Pressure reading (for models GFM4 only). Mass Flow reading in current engineering units.

• Current Gas Table and Gas Name.

• Totalizer Volume reading in current volume based engineering units.

•

• Totalizer , Alarm, and Relays status.

GFM3/4 Main Screen

NOTICE

Allow the Digital Mass Flow Meter to warm-up for a minimum of 15 minutes.

During initial powering of the GFM3/4 transducer, the flow output signal will be indicating a higher than usual output. This is an indication that the GFM3/4 transducer has not yet attained its minimum operating temperature. This condition will automatically cancel within a few minutes and the transducer should eventually zero.

5.2 - 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. -

5.3 - Programming GFM3/4 using LCD and Keypad

All features of the flow meter can be accessed via the local four button keypad and LCD. The LCD incorporates an energy-saving auto shut-off backlit feature. If enabled, after 15 minutes of operation without user intervention the LCD backlight turns off. In order to turn on the LCD backlight press any key on the keypad. The LCD backlight energy-saving auto shut-off feature can be disabled or enabled by user (see p. 5.3.12 "LCD backlight Energy-saving Setting").

.3.1 - Changing Units of Measurement for Temperature and Pressure

eading

y default after power up, the temperature reading is displayed in °F and pressure

n PSI. Pressing ( ) [Enter] button from main screen will alter the units of measure

i to °C for temperature and kPa for pressure reading respectively. In order to change units of measure back to °F for temperature and PSI for pressure, press ( ) [Enter] button while in the main screen one more time.

.3.2 - Monitoring GFM3/4 Peripheries Settings

he last row at the bottom of the main LCD screen reflects settings and status for

T Totalizer, Flow Alarm, and Relays (see Figure b-2).

igure B-2

Totalizer Status:

TOT: R - totalizer is running (Enabled). TOT: S - totalizer is stopped (Disabled).

low Alarm Status:

: S - flow alarm is disabled.

A A: R,N - flow alarm is enabled and currently there are no alarm conditions. A: R,L - flow alarm is enabled and currently there is Low alarm condition. A: R,H - flow alarm is enabled and currently there is High alarm condition.

Relay Settings:

N - No assignment (relay is not assigned to any events). H - High Flow Alarm condition. L - Low Flow Alarm condition. R - Range between High and Low Flow Alarm condition. T - Totalizer reached set limit. A - High Temperature Alarm condition. B - Low Temperature Alarm condition. C - High Pressure Alarm condition. D - Low Pressure Alarm condition.

Continued pressing of the ( ) [Up] button from the main screen will switch the status line to display the following information:

- Calibrated full-scale range in standard L/min for current Gas Table.

- Device Digital Communication interface type (RS-485 or RS-232).

- Device RS-485 address (two hexadecimal characters).

- Device Zero DAC counts (for troubleshooting purposes).

- Device Sensor Average ADC counts (for troubleshooting purposes).

- Device Sensor Compensated ADC counts (for troubleshooting purposes).

NOTICE

Pressing the ( ) [Dn] button from any of the status line will

switch the status display to one step back.

Page 5

5.3.3 - GFM3/4 Main Menu

Pressing of the ( ) [Esc] button from the main screen will switch the display to the

ain Menu. The following screen will appear:

If the User defined Unit of Measure option is selected the following screen will appear:

igure b-5, User Defined Unit of Measure Screen (K factor)

Figure b-3, GFM3/4 Main Menu Screen

ressing of the ( ) [Up] or ( ) [Dn] buttons allows the user to scroll up or down

he menu options. Press ( ) [Enter] button to select the highlighted option of the

enu.

The following menu options are available:

1. Units of Measure - View or Change the Units of Measure for Flow process

ariable.

. Gas Table Select - View or Change the Gas Table.

. Totalizer - View or Change settings for Totalizer.

4. Alarm Settings - View or Change settings for Flow, Pressure and Temperature

larm.

. Relay Action - View or Change settings for each of two available Relays.

6. K Factors - View or Change settings for User defined or Internal K Factors.

7. Zero Calibration - Initiate Automatic Sensor Zero Calibration.

8. Flow Conditions - Allows the user to set the Actual or Standard Flow conditions.

9. BackLight Timer - Allows the user to turn On/Off the Energy-saving for LCD

acklight.

10.Exit - Returns to the Main Screen with process variables reading.

NOTICE

5.3.4 Gas Flow Engineering Units Settings

While in the Main Menu scroll with ( ) [Up] or ( ) [Dn] button to highlight the Units of Measure option and press the ( ) [Enter] button. The following screen will appear.

Pressing the ( ) [Esc] button from any level of the Menu will switch the menu to one level higher (up to Main Screen).

Figure b-4, GFM3/4 Units of Measure Screen

In order to specify the User Defined Unit of Measure user has to set three key parameters:

factor - Conversion factor relative to L/min unit of measure.

ime base - Hours, Minutes, or Seconds.

T Density - Use density (YES / NO).

Press the ( ) [Enter] button to move the flashing cursor to the digit that has to be adjusted. Pressing ( ) or ( ) will increment or decrement a particular digit

espectively. The numbers will change from 0 to 9 and next to the decimal point (.).

ressing the ( ) button one more time will change the digit on the highlighted

osition of the cursor back to 0. The same is true in reverse when pressing the

p ( ) button. Only one decimal point is allowed. If changing position of the decimal

oint is required, change decimal point to any desired digit then move the cursor to

he required position and adjust it to the decimal point with ( ) or ( ) button. When

t complete with K-factor value settings, press the ( ) [Esc] button to move in to the Time base settings screen. The following screen will appear:

Figure b-6, User Defined Unit of Measure Screen (Time base)

Use ( ) or ( ) buttons to highlight desired time base option. Press the ( ) [Enter] button to set the Time base and move in to the density settings screen. The following screen will appear:

The following Engineering Units menu options are available:

1. % FS - percent of full-scale.

2. L/min - Liters per minute.

3. L/h - Liters per hour.

4. mL/min - milliliters per minute.

5. mL/h - milliliters per hour.

6. SCFH - cubic feet per hour.

7. SCFM - cubic feet per minute.

8. LbPH - pounds per hour.

9. LbPM - pounds per minute.

10. User - User defined Unit of Measure.

11. Exit - Exit to Main Menu

Selecting option 1 to 9 sets the corresponding Unit of Measure and switches the LCD back to Main Menu.

NOTICE

Once Flow Unit of Measure is changed the Totalizer's Volume based Unit of Measure will be changed automatically.

Figure b-7, User Defined Unit of Measure Screen (Density)

Use ( ) or ( ) button to highlight desired density option. Press the ( ) [Enter] button when done. The LCD will display the Units of Measure Screen and new settings will be reflected at the bottom status line.

5.3.5 - Gas Table Settings

The GFM3/4 Mass Flow Meter is capable to store calibration data for up to 10 different gases.

NOTICE

ordered). If instead of the valid Gas Name (for example NITROGEN) the main creen displays Gas designator as "Uncalibrated", then the user has chosen the gas table which was not calibrated. Using an Uncalibrated Gas Table will result in erroneous reading.

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By default the GFM3/4 is shipped with at least one valid calibration table (unless optional additional calibrations were

rom the Main Menu, the user would traverse the menu tree until reaching the "Gas

able Select" menu. The following screen will appear:

se ( ) or ( ) button to highlight "Start at Flow" option and press the ( ) [Enter]

utton. The following screen will appear:

’

Figure b-8, Current Gas Table Settings

se ( ) or ( ) button to select desired Gas Table, and press the ( ) [Enter]

utton. The LCD will display the Main Menu screen. If desired, press the ( ) [Esc]

b button to go back to the Main GFM3/4 screen. The new gas table number and the name of the gas will be reflected on the Main GFM3/4 screen.

5.3.6 - Totalizer Settings

he total volume of the gas is calculated by integrating the actual gas flow rate with

espect to time. Both keypad menu and digital interface commands are provided to:

• Set the totalizer to ZERO.

• Start the totalizer at a preset flow.

• Assign action at a preset total volume. Start/stop (enable/disable) totalizing the flow.

• Read totalizer.

•

The totalizer has several attributes which may be configured by the user. These attributes control the conditions which cause the totalizer to start integrating the gas flow, and also specify actions to be taken when the Total Volume is outside the specified limit.

NOTICE

entered in %FS engineering unit. Totalizer will not totalize until the flow rate becomes equal or more than the Totalizer Start value. Totalizer Stop values have to be entered in volume / mass based engineering units.

Totalizer action conditions become true when the totalizer reading and preset "Stop at Total" volumes are equal.

From the Main Menu, the user would traverse the menu tree until reaching the "Totalizer" menu. The following screen will appear:

Before enabling the Totalizer, ensure that all totalizer settings are configured properly. Totalizer Start values have to be

Figure b-11, Totalizer Settings (Start)

ressing ( ) or ( ) will increment or decrement Start Flow value per 0.1% FS

espectively. When done with adjustment, press the ( ) [Enter] button.

Use ( ) or ( ) button to highlight "Stop at Total" option and press the ( ) [Enter] button. The following screen will appear.

Figure b-12, Totalizer Settings (Stop)

Press the ( ) [Enter] button to move the flashing cursor to the digit that has to be adjusted. Pressing ( ) or ( ) will increment or decrement a particular digit respectively. The numbers will change from 0 to 9. Pressing the ( ) button one more time will change the digit on the highlighted position of the cursor back to 0. The same is true in reverse,when pressing the ( ) button. Only one decimal point is allowed. If changing position of the decimal point is required, change decimal point to any desired digit then move the cursor to the required position and adjust it to the decimal point with ( ) or ( ) button. When done with adjustment, press the ( ) [Esc] button.

5.3.7 - Alarm Settings

GFM3/4 provides the user a flexible alarm/warning system that monitors the Process Variables (Gas Flow, Pressure and Temperature) for conditions that fall outside configurable limits, and then provides feedback to the user visually via the LCD (only for Flow) or via a Relay contact closure.

Figure b-9, Totalizer Settings

Mode Run/Stop - Allows the user to Enable/Disable Totalizer. Start at Flow - Allows the user to enter Gas flow rate in %FS at which Totalizer

starts integrating of the gas flow.

Stop at Total - Allows the user to enter Totalizer Limit Volume when user defined

action will occur.

Reset to Zero - Allows the user to reset Totalizer reading to zero.

Use ( ) or ( ) button to highlight "Mode Run/Stop" option and press the ( ) [Enter] button. The following screen will appear:

’

Figure b-10, Totalizer Settings (Stop/Run)

There are three different alarms:

• Gas Flow - (GFM 3/4)

• Gas Temperature - (GFM4)

• Gas Pressure - (GFM4)

Each alarm has several attributes which may be configured by the user. These attributes control the conditions which cause the alarm to occur, and also specify actions to be taken when the Process Variable is outside the specified conditions.

NOTICE

conditions.

From the Main Menu, the user would traverse the menu tree until reaching the "Alarm Settings" menu. The following screen will appear:

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All three alarms are non-latching. That means the alarm is indicated only while the monitored value exceeds the specified

Figure b-13, Alarm Settings

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