Omega GFM2 User guide

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Series GFM2 Digital Mass Flow Meter

Installation and Operating Instructions

Bulletin F-GFM2 Rev A

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]

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

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TABLE OF CONTENTS

1. Unpacking the GFM2 Flow Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

1.1 Inspect Package for External Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

1.2 Unpack the Mass Flow Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

1.3 Returning Merchandise for Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

2.1 Primary Gas Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

2.2 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

2.2.1 Power Supply Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

2.2.2 Output Signal Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

2.2.3 Output Communication Parameters and Connections . . . . . . . . . . .3

3. Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

7. Calibration Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

7.1 Flow Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

7.2 Gas Flow Calibration of GFM2 Mass Flow Meters . . . . . . . . . . . . . . . . . .8

7.2.1 Connections and Initial Warm Up . . . . . . . . . . . . . . . . . . . . . . . . . . .8

7.2.2 ZERO Check/Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

7.2.3 Gas Linearization Table Adjustment . . . . . . . . . . . . . . . . . . . . . . . . .8

7.3 Analog Output Calibration of GFM2 Mass Flow Meters . . . . . . . . . . . . . . .9

7.3.1 Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

7.3.2 Gas Flow 0 to 5 VDC Analog Output Calibration . . . . . . . . . . . . . . . .9

7.3.3 Gas Flow 4 to 20 mA Analog Output Calibration . . . . . . . . . . . . . . . .9

8. RS-485/RS-232 Software Interface Commands . . . . . . . . . . . . . . . . . . . . . . .9

8.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

8.2 Commands Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

8.3 ASCII Commands Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

4. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

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

5.1 Preparation and Warm Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

5.2 Swamping Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

5.3 GFM2 Parameters Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

5.3.1 Engineering Units Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

5.3.2 Gas Table Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

5.3.3 Totalizer Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

5.3.4 Flow Alarm Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

5.3.5 Relay Assignment Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

5.3.6 K-Factors Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

5.3.7 Zero Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

5.3.8 Self Diagnostic Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

5.4 Analog Output Signals Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

6. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

6.2 Flow Path Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

6.2.1 Restrictor Flow Element (RFE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

6.2.2 GFM2 Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

9. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

9.1 Common Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

9.2 Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

9.3 Technical Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

10. Calibration Conversions from Reference Gases . . . . . . . . . . . . . . . . . . .13

Appendix I GFM2 EEPROM Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Appendix II Internal User Selectable Gas Factor Table

(Internal “K” Factors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Appendix III Gas Factor Table (“K” Factors) . . . . . . . . . . . . . . . . . . . . . .16

Appendix IV Component Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Appendix V Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Appendix VI Maintenance/Repair, Warranty/Return . . . . . . . . . . . . . . . . .19

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1. UNPACKING THE GFM2 MASS FLOW METER

1.1 - Inspect Package for External Damage

Your GFM2 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 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.

1.3 - Maintenance/Repair

Upon final installation of the Series GFM2, no routine maintenance is required. The Series GFM2 is not field serviceable and should be returned if repair is needed. Field repair should not be attempted and may void warranty.

Warranty/Return

Refer to “Terms and Conditions of Sales” in our catalog and on our website. Contact customer service to receive a Return Goods Authorization number before shipping the product back for repair. Be sure to include a brief description of the problem plus any additional application notes.

2. INSTALLATION

2.1 - Primary Gas Connections

Please note that the GFM2 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.

CAUTION

application. For more information, contact your distributor or Dwyer.

Attitude limit of Mass Flow Meter is ±15° 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 GFM2 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

pressure above 500 PSIA (34.47 bars) will seriously damage the flow sensor and may cause serious injury or death.

GFM2 transducers are supplied with standard 1/4˝ or 3/8˝ inlet and outlet compression fittings which should not be removed unless the meter is being cleaned or calibrated for a new flow range.

GFM2 transducers should not be used for monitoring OXYGEN gas unless specifically cleaned and prepared for such

For models GFM2 models the maximum pressure in the gas line should not exceed 500 PSIA (34.47 bars). Applying

CAUTION

2.2.2 - Output Signals Connections

CAUTION

do so might cause damage to this device. Be sure to check that the wiring and the polarity of the power supply is correct before turning the power ON. Wiring error may cause damage or faulty operation.

GFM2 Mass Flow Meters are equipped with either calibrated 0 to 5 VDC (0 to 10 VDC optional) or calibrated 4 to 20 mA output signals (jumper selectable). This linear output signal represents 0 to 100% of the flow meter's full scale range.

CAUTION

output signals!

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

Plus (+) ------------------- pin 2 of the 15 pin "D" connector Minus (-) ------------------- pin 1 of the 15 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 RS-485 (optional RS-232 or Profibus DP is available) and provides access to applicable internal data including: flow, CPU 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:

RS-485 Communication Interface Connection:

The RS-485 converter/adapter has to be configured for: multidrop, 2 wire, half duplex mode. 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 8 of the 15 pin "D" connector (TX-) RS-485 T(+) or R(+) -------- pin 15 of the 15 pin "D" connector (RX+) RS-485 GND (if available) -------- pin 9 of the 15 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 8 of the 15 pin "D" connector (TX) RS-232 TX (pin 3 on the DB9 connector) -------- pin 15 of the 15 pin "D" connector (RX) RS-232 GND (pin 5 on the DB9 connector) -------- pin 9 of the 15 pin "D" connector (GND)

Do not apply power voltage above 26 VDC. Doing so will cause GFM2 damage or faulty operation.

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

All 4 to 20 mA current loop outputs are self-powered (nonisolated). Do not connect an external voltage source to the

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

Using a Helium Leak Detector or other equivalent method perform a thorough leak test of the entire system. (All GFM2’s are checked prior to shipment for leakage within stated limits. See specifications in this manual.)

2.2 - Electrical Connections

GFM2 is supplied with a 25 pin "D" connector. Pin diagram is presented in figure b-1.

2.2.1 - Power Supply Connections

The power supply requirements for GFM2 transduers are: 11 to 26 VDC, (unipolar power supply)

DC Power (+) --------------- pin 7 of the 15 pin "D" connector DC Power (-) --------------- pin 5 of the 15 pin "D" connector

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PIN GFM2 FUNCTION

1 Common, Signal Ground

For Pin 2 (4 to 20 mA return)

2 0 to 5 VDC or 4 to 20 mA

Flow Signal Output

3 Relay No. 2 - Normally Open

Contact

4 Relay No. 2 - Common

Contact

5 Common, Power Supply

(- DC power for 11 to 26 VDC)

6 Relay No. 1 - Common

Contact

7 Plus Power Supply

(+ DC power for 11 to 26 Vdc) 8 RS485 (-) (Optional RS232 TX) 9 RS232 Signal GND (RS-485

GND Optional) 10 Do not connect

(Test/Maintenance terminal)

11 Relay No. 2 - Normally Closed

Contact 12 Relay No. 1 - Normally Open

Contact 13 Relay No. 1 - Normally Closed

Contact 14 Do not connect

(Test/Maintenance terminal)

15 RS485 (+) (Optional RS232

RX) Shield Chassis Ground

NOTICE

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

In general, "D" Connector numbering patterns are

standardized. There are, however, some connectors with

Make sure power is OFF when connecting or disconnecting any cables in the system.

Additionally, the GFM2 Mass Flow Meter incorporates a precision analog microcontroller and non-volatile memory that stores all hardware specific variables and up to 10 different calibration tables. The flow rate can be displayed in 23 different volumetric or mass flow engineering units. Flow meter parameters and functions can be programmed remotely via the RS-232/RS-485 interface or optional Profibus DP interface. GFM2 flow meters support various functions including: programmable flow totalizer, low, high or range flow alarm, automatic zero adjustment (activated via local button or communication interface), 2 programmable SPDT relays output, 0 to 5 VDC / 4 to 20 mA analog outputs (jumper selectable), self diagnostic alarm, 36 internal and user defined K-factor. Optional local 2x16 LCD readout with adjustable back light provides flow rate and total volume reading in currently selected engineering units and diagnostic events indication.

SPECIFICATIONS Service: Clean gases compatible with wetted parts. Wetted Materials:

GFM2-X-X-A: Anodized aluminum, brass, 316 SS fluoroelastomer O-rings; GFM2-X-X-S: 316 SS, and fluoroelastomer O-rings; Buna-N, EPR and PTFE

O-rings optional.

Accuracy: ±1% FS. Repeatability: ±0.25% FS. Response Time: 2 seconds to within ±2% of actual flow. Output Signal: Linear 0 to 5 VDC (3000 Ω min. load impedance) and 4 to 20 mA

(500 Ω max. loop resistance).

Max. Particulate Size: 5 microns. Temperature Limits: 32 to 122°F (0 to 50°C). Power Supply: 11 to 26 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.

Display: 2 x 16 character LCD. Pressure Limits: 500 psig (34.5 bar). Leak Integrity: 1 x 10-9 smL/sec of helium. Weight: 1.05 lb (0.48 kg).

The (+) and (-) power inputs are each protected by a 300 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 feet (3 meters).

Use of the GFM2 flow transducer in a manner other than that specified in this manual or in writing from Dwyer, 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 temperature 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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low Rates

Flow rates are stated for Nitrogen at STP conditions [i.e. 70°F (21.1°C) at 1 atm]. For other gases use the K factor as a multiplier from APPENDIX III.

Model

std liters/min)

(

GFM2-X-101

Flow Rate

odel

FM2-X-101 Transmitter

. OPERATING INSTRUCTIONS

.1 - Preparation and Warm Up

p to 10

able IV - Pressure Drops

aximum Pressure Drop

mm H

(

eight

.20 lb (1.00 kg)

)

(psid)

.18

hipping Weight

.70 lb (1.68 kg)

(kPa)

.275

It is assumed that the Digital Mass Flow Meter has been correctly installed and thoroughly leak tested as described in section 2. Make sure the flow source is OFF. When applying power to a flow meter within the first 2 seconds you will see on the

CD display: the product name, the software version, and revision of the

EPROM table (applicable for LCD option only).

S: Ver1.4 Rev.A0

Figure b-2: GFM2 First Banner Screen

OTICE

or the GFM2 transducer with LCD option: If the LCD diagnostic is activated, the

econd line of the LCD will display the time remaining until the end of the warm

p period (Minutes:Seconds format) and will alternatively switch to Totalizer reading

ndication every 2 seconds.

uring the first 6 minutes of the initial powering of the GFM2

ransducer, the status LED will emit a constant amber light.

F: 50.0 L/min

** WarmUp 2:39 **

Figure b-5: GFM2 Main Screen During Sensor Warm Up Period.

NOTICE

peration, ready to measure). For GFM2 with LCD option, the screen will reflect

o flow and totalizer reading. (see Figure b-4).

5.2 Swamping Condition

If a flow of more than 10% above the maximum flow rate of the Mass Flow Meter

s 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

e restored to below 110% of maximum meter range. Once flow rates are lowered

b to within calibrated range, the swamping condition will end. Operation of the meter above 110% of maximum calibrated flow may increase recovery time.

fter 6 minutes of the initial powering of the GFM2 transducer,

he status LED will emit a constant GREEN light (normal

Within the next 2 seconds, the RS-485 network address, the analog output settings,

nd currently selected gas calibration table will be displayed (applicable for LCD

ption only).

Ad: 11 Out: 0 to 5 VDC

Gas# 1 AIR

Figure b-3: GFM2 Second Banner Screen

NOTICE

Actual content of the LCD screen may vary depending on the model and device configuration.

After 2 seconds, the LSD display switches to the main screen with the following information:

- Mass Flow reading in current engineering units (upper line).

- Totalizer Volume reading in current volume or mass based engineering units (lower line).

F: 50.0 L/min

T: 75660.5 Ltr

Figure b-4: GFM2 Main Screen

NOTICE

During initial powering of the GFM2 transducer, the flow output signal will be indicating a higher than usual output. This is an indication that the GFM2 transducer has not yet attained its minimum operating temperature. This condition will automatically cancel within a few minutes and the transducer should eventually indicate 0.

Allow the Digital Mass Flow Meter to warm-up for a MINIMUM of 6 minutes.

5.3 GFM2 Parameters Settings

.3.1 Engineering Units Settings

he GFM2 Mass Flow Meter is capable of displaying flow rate with 23 different

T Engineering Units. Digital interface commands (8.3 ASCII Command Set “GFM2 SOFTWARE INTERFACE COMMANDS”) are provided to:

- get currently active Engineering Units

- set desired Engineering Units.

The following Engineering Units are available:

Units of Measure

Number

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

Index

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Flow Rate

Engineering

Units

% mL/sec mL/min mL/hr L/sec L/min L/hr

/sec

/min

/hr

/sec

/min

/hr g/sec g/min g/hr kg/sec kg/min kg/hr Lb/sec Lb/min Lb/hr User

Totalizer

Engineering

Units

%s mL mL mL Ltr Ltr Ltr

ft g g g kg kg kg Lb Lb Lb UD

Description

Percent of full scale Mililiter per second Mililiter per minute Mililiter per hour Liter per second Liter per minute Liter per hour Cubic meter per second Cubic meter per minute Cubic meter per hour Cubic feet per second Cubic feet per minute Cubic feet per hour Grams per second Grams per minute Grams per hour Kilograms per second Kilograms per minute Kilograms per hour Pounds per second Pounds per minute Pounds per hour User Defined

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NOTICE

automatically.

Once Flow Unit of Measure is changed, the Totalizer’s Volume/Mass based Unit of Measure will be changed

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5.3.2 Gas Table Settings

The GFM2 Mass Flow Meter is capable of storing calibration data for up to 10 different gases. Digital interface commands are provided to:

- get currently active Gas Table number and Gas name

- set desired Gas Table.

NOTICE

ordered). If instead of the valid Gas name (for example NITROGEN), the LCD screen or digital interface 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.

5.3.3 Totalizer Settings

The total volume of the gas is calculated by integrating the actual gas flow rate with respect to the time. Digital interface commands are provided to:

- reset 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 via digital interface

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 to specify actions to be taken when the Total Volume is outside the specified limit.

NOTICE

entered in % FS engineering unit. The Totalizer will not totalize until the flow rate becomes equal to or more than the Totalizer Start value. Totalizer Stop values must be entered in currently active volume / mass based engineering units. If the Totalizer Stop at preset total volume feature is not required, then set Totalizer Stop value to 0.

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

By default the GFM2 is shipped with at least one valid calibration table (unless optional additional calibrations were

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

Latch Mode - Controls Latch feature when Relays are assigned to Alarm event. Following settings are available: 0 - Latch feature is disabled for both relays 1 - Latch feature is enabled for Relay#1 and disabled for Relay#2 2 - Latch feature is enabled for Relay#2 and disabled for Relay#1 3 - Latch feature is enabled for both relays.

NOTICE

conditions. If Relay is assigned to the Alarm event, in some cases, the Alarm Latch feature may be desirable.

The current Flow Alarm settings and status are available via digital interface (8.3 ASCII Command Set “GFM2 SOFTWARE INTERFACE COMMANDS”).

5.3.5 Relay Assignment Settings

Two sets of dry contact relay outputs are provided to actuate user supplied equipment. These are programmable via digital interface such that the relays can be made to switch when a specified event occurs (e.g. when a low or high flow alarm limit is exceeded or when the totalizer reaches a specified value).

The user can configure each Relay action from 6 different options: No Action : (N) No assignment (relay is not assigned to any events and not energized). Totalizer > Limit : (T) Totalizer reached preset limit volume. High Flow Alarm : (H) High Flow Alarm condition. Low Flow Alarm : (L) Low Flow Alarm condition. Range between H&L : (R) Range between High and Low Flow Alarm condition. Manual Enabled : (M) Activated regardless of the Alarm and Totalizer conditions.

5.3.6 K-Factors Settings

Conversion factors relative to nitrogen for up to 36 gases are stored in the GFM2 (see APPENDIX II). In addition, provision is made for a user-defined conversion factor. Conversion factors may be applied to any of the ten gas calibrations via digital interface commands.

If the alarm condition is detected, and the Relay is assigned to Alarm event, the corresponding Relay will be energized.

By default, flow alarm is non-latching. That means the alarm is indicated only while the monitored value exceeds the specified

Local maintenance push button is available for manual Totalizer reset on the field. The maintenance push button is located on the right side of the flow meter inside the maintenance window above the 15 pin D-connector (see Figure C-1 “GFM2 configuration jumpers”).

NOTICE

sequence is recommended:

1. Disconnect GFM2 from the power.

2. Press maintenance push button (do not release).

3. Apply power to the GFM2 while holding down the maintenance push button.

4. Release maintenance push button after 6 seconds. For GFM2 with optional LCD, when GFM2 Main Screen appears (see Figure b-4).

5.3.4 Flow Alarm Settings

GFM2 provides the user with a flexible alarm/warning system that monitors the Gas Flow for conditions that fall outside configurable limits as well as visual feedback for the user via the status LED and LCD (only for devices with LCD option) or via a Relay contact closure.

The flow alarm has several attributes which may be configured by the user via a digital interface. These attributes control the conditions which cause the alarm to occur and to specify actions to be taken when the flow rate is outside the specified conditions.

Mode Enable /Disable - Allows the user to Enable/Disable Flow Alarm. Low Alarm - The value of the monitored Flow in % FS below which is considered an alarm condition.

NOTICE

High Alarm - The value of the monitored Flow in % FS above which is considered an alarm condition.

NOTICE

Action Delay - The time in seconds that the Flow rate value must remain above the high limit or below the low limit before an alarm condition is indicated. Valid settings are in the range of 0 to 3600 seconds.

In order to locally Reset Totalizer, the reset push button must be pressed during power up sequence. The following

The value of the Low alarm must be less than the value of the High Alarm.

The value of the High alarm must be more than the value of the Low Alarm.

The available K Factor settings are:

• Disabled (K = 1).

• Internal Index The index [0-35] from internal K factor table (see APPENDIX II).

• User Defined User defined conversion factor.

NOTICE

5.3.7 Zero Calibration

The GFM2 includes an auto zero function that, when activated, automatically adjusts the mass flow sensor to read zero. The initial zero adjustment for your GFM2 was performed at the factory. It is not required to perform zero calibration unless the device has zero reading offset with no flow conditions.

NOTICE

condition is established.

Shut off the flow of gas into the Digital Mass Flow Meter. To ensure that no seepage or leak occurs into the meter, it is good practice to temporarily disconnect the gas source. The Auto Zero may be initiated via digital communication interface or locally by pressing the maintenance push button, which is located on the right side of the flow meter inside the maintenance window above the 15 pin D-connector (see Figure C-1 “GFM2 configuration jumpers”).

NOTICE

will prevent initiating Auto Zero function via the maintenance push button before the 6 minutes sensor warm up period has elapsed.

To start Auto Zero locally, press the maintenance push button. The status LED will flash not periodically with the RED light. On the GFM2 with optional LCD, the following screen will appear:

The conversion factors will not be applied for % FS engineering unit.

Before performing Zero Calibration, make sure the device is powered up for at least 15 minutes and absolutely no flow

The same maintenance push button is used for Auto Zero initiation and Totalizer reset. The internal diagnostic algorithm

AUTOZERO IS ON!

Figure b-6: GFM2 Screen in the Beginning of Auto Zero Procedure

Page 6

Page 7

he Auto Zero procedure normally takes 1 to 2 minutes during which time the DP

T Zero counts and the Sensor reading changes approximately every 3 to 6 seconds.

AUTOZERO IS ON!

S: 405 DP: 512

igure b-7: GFM2 During the Auto Zero Procedure

he nominal value for a fully balanced sensor is 120 counts. If the GFM2’s digital

T signal processor was able to adjust the Sensor reading within 120 ± 10 counts, then Auto Zero is considered successful. The status LED will return to a constant GREEN light.

OTICE

If the device was unable to adjust the Sensor reading to within 120 ± 10 counts, then Auto Zero is considered as unsuccessful. The constant RED light will appear on the status LED. The user will be prompted with the “AutoZero ERROR!” screen.

NOTICE

5.3.8 Self Diagnostic Alarm

GFM2 series Mass Flow Meters are equipped with a self-diagnostic alarm which is available via multicolor LED, digital interface and on screen indication (for devices with optional LCD). The following diagnostic events are supported:

Number

5 6 7

8 9 10

NOTICE

event with the highest priority level will be indicated on the status LED and displayed on the LCD (if equipped). All diagnostic events may be accessed simultaneously via digital communication interface.

5.4 Analog Output Signals Configuration

GFM2 series Mass Flow Meters are equipped with calibrated 0 to 5 VDC and 4 to 20 mA output signals. The set of the jumpers (J7A, J7B, J7C) located on the right side of the flow meter, inside of the maintenance window above the 15 pin Dconnector (see Figure C-1 “GFM2 configuration jumpers”) are used to switch between 0 to 5 VDC or 4 to 20 mA output signals (see Table VI). Analog output signals of 0 to 5 VDC and 4 to 20 mA are attained at the appropriate pins of the 15pin "D" connector (see Figure b-1) on the side of the GFM2 transducer.

he actual value of the Sensor and DP counts will vary for

ach GFM2.

or GFM2 with RS-232 option all Auto Zero status info

F available via digital communication interface.

ED Color

Diagnostic Alarm Description

Auto Zero procedure is running

FATAL ERROR (reset or maintenance

ervice is required for return in to the

s normal operation) CPU Temperature too high (Electronics Overheating) Sensor in the warm up stage (first 6 minutes after power up sequence, normal operation, no critical diagnostic events present) Flow Sensor Temperature too low Flow Sensor Temperature too high Totalizer Reading hit preset limit

Low Flow Alarm conditions High Flow Alarm conditions Normal operation, no diagnostic events

[0] - Priority Level is highest (most important). When two or more diagnostic events are present at the same time, the

and Pattern

Not periodically flashing RED Constant RED

Flashing RED/UMBER

Constant UMBER

Flashing UMBER/OFF Flashing RED/OFF Flashing GREEN/UMBER Flashing GREEN/OFF Flashing GREEN/RED Constant GREEN

riority

P Level

4 5 6

7 8 9

to 20 mA

5-9 6-10 7-11

J7.A J7.B J7.C

1-5 2-6 3-7

nalog Signal Output

Flow Rate Output

umper Header J7

able VI - Analog Output Jumper Configuration

See APPENDIX IV for actual jumpers layout on the PCB.

OTICE

. MAINTENANCE

.1 Introduction

It is important that the Mass Flow Meter is only used with clean, filtered gases. 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

rystallization. Other flow passages are also easily obstructed.

herefore, great care must be exercised to avoid the introduction of any potential

T flow impediment. To protect the instrument, a 50 micron (GFM2-X-010) 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

ibration, hot or corrosive environments and excessive RF or magnetic interference.

f periodic calibrations are required, they should be performed by qualified

I personnel and calibrating instruments, as described in section 7. It is recommended that units are returned to Dwyer for repair service and calibration.

ARNING

OMPLETELY PURGED AND NEUTRALIZED OF TOXIC, BACTERIOLOGICALLY

NFECTED, 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 clogged, 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.

CAUTION

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.

6.2.2 GFM2-X-010 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 to the RFE. Be sure that no dust has collected on the O-ring seal.

NOTICE

CALIBRATION POINT BE CHECKED AFTER RE-INSTALLING THE INLET FITTING.

Digital output (communication) is simultaneously available with analog output.

TO PROTECT SERVICING PERSONNEL IT IS MANDATORY THAT ANY INSTRUMENT BEING SERVICED IS

DISASSEMBLY MAY COMPROMISE CURRENT CALIBRATION.

OVER TIGHTENING WILL DEFORM AND RENDER THE RFE DEFECTIVE. IT IS ADVISABLE THAT AT LEAST ONE

to 5 VDC

J7.A J7.B J7.C

Page 7

Page 8

. CALIBRATION PROCEDURES

NOTICE

METER, AS DESCRIBED IN THIS SECTION, WILL VOID ANY CALIBRATION WARRANTY APPLICABLE.

.1 Flow Calibration

Dwyer Instruments' Flow Calibration Laboratory offers professional calibration support for Mass Flow Meters using precision calibrators under strictly controlled conditions. Calibrations can also be performed at customers' site using available

tandards.

actory calibrations are performed using NIST traceable precision volumetric

alibrators incorporating liquid sealed frictionless actuators.

Generally, calibrations are performed using dry nitrogen gas. The calibration can then be corrected to the appropriate gas desired based on relative correction [K]

actors shown in the gas factor table (see APPENDIX III). A reference gas, other

han nitrogen, may be used to better approximate the flow characteristics of certain

ases. This practice is recommended when a reference gas is found with

g thermodynamic properties similar to the actual gas under consideration. The appropriate relative correction factor should be recalculated (see section 9).

EMOVAL OF THE FACTORY INSTALLED CALIBRATION

R SEALS AND/OR ANY ADJUSTMENTS MADE TO THE

.2.3 Gas Linearization Table Adjustment

NOTICE

device’s front label). There is no need to adjust the gas linearization table unless linearity adjustment is needed, flow range has to be changed, or new additional

alibration is required. Any alteration of the gas linearization table will

OID calibration warranty supplied with instrument.

Gas flow calibration parameters are separately stored in the Gas Dependent portion of the EEPROM memory for each of 10 calibration tables. See APPENDIX

for complete list of gas dependent variables.

NOTICE

be applied to the currently selected gas. Use Gas Select command via digital communication interface or Dwyer supplied calibration and maintenance software to verify current gas table or select a new gas table.

ctual flow values are entered in normalized fraction format: 100.000 % FS

orresponds to 1.000000 flow value and 0.000 % FS corresponds to 0.000000 flow

c value. The valid range for flow values is from 0.000000 to 1.000000 (note: GFM2 will accept up to 6 digits after decimal point).

our GFM2 Digital Mass Flow Meter was calibrated at the

Y factory for the specified gas and full scale flow range (see

ake sure the correct gas number and name selected are

urrent. All adjustments made to the gas linearization table will

It is standard practice to calibrate Mass Flow Meters with dry nitrogen gas at

0.0°F (21.1°C), 20 psia (137.9 kPa absolute) inlet pressure and 0 psig outlet

ressure. It is best to calibrate GFM2 transducers to actual operating conditions.

pecific gas calibrations of non-toxic and non-corrosive gases are available for

S specific conditions. Please contact your distributor or Dwyer for a price quotation.

It is recommended that a flow calibrator be used which has at least four times better collective accuracy than that of the Mass Flow Meter to be calibrated.

quipment required for calibration includes: a flow calibration standard, PC with

vailable RS-485/RS-232 communication interface, a certified high sensitivity

ulti meter (for analog output calibration only), an insulated (plastic) screwdriver,

m a flow regulator (for 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). Using Dwyer supplied calibration and maintenance software to simplify the calibration process is recommended.

Gas and ambient temperature, as well as inlet and outlet pressure conditions, should be set up in accordance with actual operating conditions.

7.2 Gas Flow Calibration of GFM2 Mass Flow Meters

All adjustments in this section are made from the outside of the meter via digital communication interface between a PC (terminal) and GFM2. There is no need to disassemble any part of the instrument or perform internal PCB component (potentiometers) adjustment.

GFM2 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 7.2.3. Flow range changes may require a different Restrictor Flow Element (RFE). Consult your distributor or Dwyer for more information.

7.2.1 Connections and Initial Warm Up

Power up the Mass Flow Meter for at least 15 minutes prior to commencing the calibration procedure. Establish digital RS-485/RS-232 communication between PC (communication terminal) and the GFM2. Start Dwyer supplied calibration and maintenance software on the PC.

7.2.2 ZERO Check/Adjustment

Using Dwyer supplied calibration and maintenance software open Back Door access:

Sensor readings are entered in counts of 12 bits ADC output and should always

e in the range of 0 to 4095. There are 11 elements in the table so the data should

e obtained at an increment of 10.0 % of full scale (0.0, 10.0, 20.0, 30.0, 40.0, 50.0,

0.0, 70.0, 80.0, 90.0 and 100.0 % FS).

If a new gas table is going to be created, it is recommended to start calibration from 100% FS. If only linearity adjustment is required, calibration can be started in any intermediate portion of the gas table.

sing the flow regulator, adjust the flow rate to 100% of FS flow. Check the

low rate indicated against the flow calibrator. Observe the flow reading on the

f GFM2. If the difference between calibrator and GFM2 flow reading is more than

0.5% FS, consult factory.

If the GFM2 flow reading is more than the calibrator reading, the number of counts in the Index 133 must be decreased. If the GFM2 flow reading is less than the calibrator reading, the number of counts in the Index 133 must be increased. Once Index 133 is adjusted with a new value, check the GFM2 flow rate against the calibrator and, if required, perform additional adjustments for Index 133.

If a simple communication terminal is used for communication with the GFM2, then “MW” (Memory Write) command from the software interface commands set may be used to adjust sensor value in the linearization table (see section 8.3 for complete software interface commands list).

Memory Read “MR” command can be used to read the current value of the index. Assuming the GFM2 is configured with RS-485 interface and has address “11”, the following example will first read the existing value of Index 133 and then write a new adjusted value:

!11,MR,133[CR] - reads EEPROM address 133 !11,MW,133,3450[CR] - writes new sensor value (3450 counts) in to the index 133

NOTICE

includes an automated calibration procedure which may radically simplify reading and writing for the EEPROM linearization table.

Once 100% FS calibration is completed, the user can proceed with calibration for another 9 points of the linearization table by using the same approach.

It is recommended to use Dwyer supplied calibration and maintenance software for gas table calibration. This software

Query/BackDoor/Open When software prompts with Warning, click the [YES] button. This will open the access to the rest of the Query menu.

Start Sensor Compensated Average reading: Query/Read/ SensorCompAverage This will display Device Sensor Average ADC counts. With no flow conditions, the sensor Average reading must be in the range 120± 10 counts. If it is not, perform Auto Zero procedure (see section 5.3.10 “Zero Calibration”).

Page 8

Page 9

7.3 Analog output Calibration of GFM2 Mass Flow Meters

GFM2 series Mass Flow Meters are equipped with calibrated 0 to 5 Vdc and 4 to 20 mA output signals. The set of the jumpers (J7A, J7B, J7C) on the printed circuit board is used to switch between 0 to 5 Vdc and 4 to 20 mA output signals (Figure C-1 “GFM2 configuration jumpers).

Analog Output RS485 Terminal Resistor

Figure C-1 GFM2 Analog Output Configuration

The GFM2 analog output calibration involves calculation and storing of the offset and span variables in the EEPROM for each available output. The 0 to 5 VDC output has only scale variable and 20 mA output has offset and scale variables. The following is a list of the Gas independent variables used for analog output computation:

Function

0 to 5 VDC 4 to 20 mA

OFF

Jumpers

J7A

5-9 1-5

J7B

6-10

2-6

J7C

7-11

3-7

JCD

8-12

4-8

7.3.3 Gas Flow 4 to 20 mA Analog Output Calibration

1. Install jumpers J7A, J7B and J7C on the PC board for 4 to 20 mA output (see Table VI).

2. Connect a certified high sensitivity multimeter set for the current measurement to pins 2 (+) and 1 (-) of the 15 pins D connector.

3. Write 4000 counts to the DAC channel 1: !11,WRITE,1,4000[CR]

4. Read current with the meter and calculate:

AoutScale_mA =

5. Write zero counts to the DAC channel 1: !11,WRITE,1,0CR]

6. Read offset current with the meter and calculate:

4000

Reading[mA]

AoutOffset_mA = -FlowOutScale_mA*Offset_Reading[mA]

7. Save AoutScale_mA in to the EEPROM: !11,MW,27,Y[CR] Save AoutOffset_mA in to the EEPROM: !11,MW,28,Z[CR]

NOTICE

full scale flow range (see the device’s front label). There is no need to perform analog output calibration unless the EEPROM IC was replaced or offset/span adjustment is needed. Any alteration of the analog output scaling variables in the Gas independent table will VOID calibration warranty supplied with instrument.

NOTICE

software includes an automated calibration procedure which may radically simplify calculation of the offsets and spans variables and, the reading and writing for the EEPROM table.It is recommended to use the Dwyer supplied calibration and maintenance software for analog output calibration. This software includes an automated calibration procedure which may radically simplify calculation of the offsets and spans variables and, the reading and writing for the EEPROM table.

Index Name Description

25 AoutScaleV - DAC 0 to 5 VDC Analog Output Scale 27 AoutScale_mA - DAC 4 to 20 mA Analog Output Scale 28 AoutOffset_mA - DAC 4 to 20 mA Analog Output Offset

7.3.1 Initial Setup

Power up the Mass Flow Meter for at least 15 minutes prior to commencing the calibration procedure. Make sure absolutely no flow takes place through the meter. Establish digital RS-485/RS-232 communication between PC (communication terminal) and GFM2. The commands provided below assume that calibration will be performed manually (w/o Dwyer supplied calibration and maintenance software) and the device has RS-485 address 11. If Dwyer supplied calibration and maintenance software is used, skip the next section and follow the software prompts.

Enter Backdoor mode by typing: !11,MW,1000,1[CR] Unit will respond with: !11,BackDoorEnabled: Y Disable DAC update by typing: !11,WRITE,4,D[CR] Unit will respond with: !11,DisableUpdate: D

The analog output available on the GFM2 Digital Mass Flow Meter was calibrated at the factory for the specified gas and

It is recommended to use the Dwyer supplied calibration and maintenance software for analog output calibration. This

Where: Y – the calculated AoutScale_mA value

Z – the calculated AoutOffset_mA value

NOTICE

command below).

Enable DAC update by typing: !11,WRITE,4,N[CR] Unit will respond with: !11,DisableUpdate: N Close BackDoor access by typing: !11,MW,1000,0[CR] Unit will respond with: !11,BackDoorEnabled: N

8. RS-485/RS-232 SOFTWARE INTERFACE COMMANDS

8.1 General

The standard GFM2 comes with an RS-485 interface. For the optional RS-232 interface, the start character (!) and two hexadecimal characters for the address must be omitted. The protocol described below allows for communications with the unit using either a custom software program or a “dumb terminal.” All values are sent as printable ASCII characters. For RS-485 interface, the start character is always (!). The command string is terminated with a carriage return (line feeds are automatically stripped out by the GFM2). See section 2.2.3 for information regarding communication parameters and cable connections.

8.2 Commands Structure

The structure of the command string: !<Addr>,<Cmd>,Arg1,Arg2,Arg3,Arg4<CR> Where: ! Start character. Addr RS485 device address in the ASCII representation of

Cmd The one or two character command from the table below. Arg1 to Arg4 The command arguments from the table below.

CR Carriage Return character.

When done with the analog output calibration make sure the DAC update is enabled and the BackDoor is closed (see

hexadecimal (00 through FF are valid).

Multiple arguments are comma delimited.

7.3.2 Gas Flow 0 to 5 VDC Analog Output Calibration

1. Install jumpers J7A, J7B and J7C on the PC board for 0-5 Vdc output (see Table VI).

2. Connect a certified high sensitivity multi meter set for the voltage measurement to the pins 2 (+) and 1 (-) of the 15 pins D connector.

3. Write 4000 counts to the DAC channel 1: !11,WRITE,1,4000[CR]

4. Read voltage with the meter and calculate:

AoutScaleV =

5. Save FlowOutScaleV in to the EEPROM: !11,MW,25,X[CR] Where: X – the calculated AoutScaleV value.

20000

Reading[V]

NOTICE

RS-232 option.

Several examples of commands follow. All assume that the GFM2 has been configured for address 18 (12 hex) on the RS485 bus:

1. To get current calibration tables: !12,G<CR>

2. To get current Alarm status: !12,A,R<CR>

3. To get a flow reading: !12,F<CR>

4. Set the high alarm limit to 85% of FS flow rate:

Page 9

Default address for all units is 11. Do not submit start character and two character hexadecimal device address for

The GFM2 will reply: !12,G 0 AIR<CR> (Assuming Current Gas table is #0, calibrated for AIR )

The GFM2 will reply: !12,N<CR> (Assuming no alarm conditions)

The GFM2 will reply: !12,50.0<CR> (Assuming the flow is at 50% FS)

The GFM2 will reply: !12,AH85.0<CR>

!12,A,H,85.0<CR>

Page 10

NOTICE

address is sent, all devices on the RS-485 bus execute the command but do not reply with an acknowledge message.

he global address can be used to change RS-485 address for a particular

T device with unknown address:

1. Make sure only one device (which address must be changed) is connected to

the RS-485 network.

. Type the memory write command with global address: !00,MW,7,XX[CR] where

X, the new hexadecimal address, can be [01 – FF].

.3 ASCII Commands Set

Command Name

low

iagnostic

Roll Back

eature

N2F

Gas Select

Auto Zero

Flow Alarms

ddress 00 is reserved for global addressing. Do not assign,

A the global address for any device. When command with global

No.

Description

equests the current flow sensor

eading in current EU.

nable / Disable LCD

E Diagnostic messages (only for LCD option). Request current status of the

iagnostic events, LED status and

CD diagnostic mode

enabled/disabled).

(

Enable / Disable Roll back

o N

eature.

Selects one of the ten primary gas calibration tables to use. Tables are entered via the MEM commands at time of calibration.

Starts /reads the status of the auto zero feature (Note: The Z,N command can be used only when absolutely no flow thru the meter and no earlier then 6 minutes after power up. It can take several minutes to complete. Unit will not respond to other commands when this is in progress). Sets / reads the status of the gas flow alarms. Note: High and Low limits have to be entered in the % FS. High alarm value has to be more than Low alarm value. Alarm conditions: Flow > High Limit = H Flow < Low Limit = L Low < Flow < High = N

Command

Argument 1

(enable LCD

E Diagnostic Messages) D (disable LCD Diagnostic

essages)

O ARGUMENT

read current status

( of the diagnostic word) E (enable Roll back to N2) D

enable Roll back to

( N2) NO ARGUMENT (read current mode of the N2Roll back ) 0 (gas 0) to 9 (gas 9) NO ARGUMENT (read status) N (do it now) W (Write Zero to EEPROM) S (Status while auto zero in progress) V (Display zero value)

H (high flow limit)

L (low flow limit)

A (action delay in seconds) E (enable alarm) D (disable alarm) R (read current status)

S (read current status)

B Block (Latch) mode

fter assigning the new address, a device will accept commands with the new

A address.

NOTICE

the same address are connected to the one RS-485 network, a communication collision will take place on the bus and communication errors will occur.

Argument 2

<Value> (0 to 100%FS) <Value> (0 to 100%FS) <Value> (0 to 3600 sec)

<Value> (0-disabled) (1-enabl’d L) (2-enabl’d H) (3-both L,H)

o not assign the same RS-485 address for two or more

evices on the same RS-485 bus. If two or more devices with

Argument 3 Argument 4 Response

<Value> (Actual flow in

urrent engineering

nits)

D:D

:0x0,L:9,E

x0 – diagnostic word

0 9 - current LED status E - LCD mode (enabled) N:E

N:D or N:E

G0 through G9, <Gas Name> G0 through G9, <Gas Name> ZN ZW (when done)

ZNI,<value> while Z, N is in progress ZV, <zero value>

AH <Value>

AL <Value>

AA: <Value>

AE AD N - (no alarm) H - (high alarm) L - (low alarm) AS:M,L,H,D,B where: M – mode (E/D) L – Low settings (%FS) H – High settings (%FS) D – Action Delay (sec) B – Latch mode (0-3) AB:<Value> where: Value = 0 - 3

Page 10

Page 11

ommand

C Name

Relay Action

Totalizer

K-Factors

Units

Description

Assigns action of the two SPDT

elays. The coil is energized

hen the condition specified by

n Argument 2 becomes true.

rgument 2:

A N - no action, relay disabled T - totalizer reading > limit H - high flow alarm

- low flow alarm

- Range between High &

ow alarms

- Manual Relay overdrive

M S - Read current status Sets and controls action of the flow totalizer.

OTE: If Warm Up Delay option

s set to E (enabled) the Totalizer

ill not totalize the flow during

w first 6 minutes after power up.

Applies a gas correction factor to the currently selected primary gas calibration table.

NOTE: does not work with %FS

(

ngineering unit.)

ee list of the internal K-factors in

S the operating manual.

Set the units of measure for gas flow and totalizer reading. Note: The units of the totalizer output are not per unit time.

No.

Command

Argument 1

(relay 1)

(relay 2)

Z (reset to zero)

(start totalizer at

low FS)

(limit gas volume

n current EU)

i D (disable totalizer) E (enable totalizer) R (read current totalizer volume)

(warm up delay)

(setting status)

D (disable, sets

=1)

K I (internal K-factor)

(user specified

actor)

S (status)

% (%FS) mL/sec mL/min mL/hr L/sec L/min L/hr

/sec

/min

/hr

/sec

/min

/hr g/sec g/min g/hr kg/sec kg/min kg/hr Lb/sec Lb/min Lb/hr USER (user defined)

No Argument <status> Returns current EU

Argument 2

N T H L R M S

value> (flow

FS)

value> (gas

olume)

- enable

- disable

No argument (enable previously set internal K-factor)

as Index (0-35)

o argument

enable

( previously set user K-factor) <value> (decimal correction factor) (0-1000)

<value> (conversion factor from L/min)

Argument 3

S - seconds M – minutes H – hours (Time base)

Argument 4

Y - use density N – do not use density

Response

1N or R2N

1T or R2T

1H or R2H

1L or R2L

R R1R or R2R R1M or R2M RxN, RxT, RxH, RxL,

xR, RxM

F<value>

L<value>

TD TE <value>(in current EU)

W:E or TW:D

S: Mode, Start, Limit,

T Warm Up KD

KI,<value>,<Gas>

I,<Index>,<Gas>

U,<value>

KU,<value>

SK, <Mode>, <Index>, <Value> where: Mode: D, I, U Index: 0-35 Value: K-Factor value U:% U:mL/sec U:mL/min U:mL/hr U:L/sec U:L/min U:L/hr

U:m

/sec

U:m

/min

U:m

/hr

U:f

/sec

U:f

/min

U:f

/hr U:g/sec U:g/min U:g/hr U:kg/sec U:kg/min U:kg/hr U:Lb/sec U:Lb/min U:Lb/hr U:USER,<Factor>, <Time base>, <Density mode>

U,<EU name>

Page 11

Page 12

ommand

ame

aintenance

M Timer Full Scale

CD Back

ight

ead

EPROM

emory

rite

W EEPROM Memory

escription

ours since last time unit was

H calibrated. Returns the full scale rated flow in

/min. (Note: This term is not

ultiplied by the current K factor)

CD Back Light control

L (0-100.0%) 0 - off 100 - Maximum Intensity

eads the value in the

pecified memory location.

Writes the specified value to the specified memory location. Use Carefully, can cause unit to

alfunction. (Note: Some

ddresses are write protected!)

ommand

rgument 1

(read timer)

(set timer to zero)

to 100%

o Argument

N <current settings>

0000 to 999

Table Index)

(

000 to 999

Table Index)

(

rgument 2

alue

rgument 3 Argument 4 Response

Value> (in Hours)

C <Value> (in L/min)

:<Counts>

here:

ounts (0 – 4095)

:<Value>

B where: Value (0 – 100.0) <value>

W,XXX,<Value>

here:

w XXX=Table Index

UART Error Codes:

1 - Not Supported Command or Back Door is not enabled.

- Wrong # of Arguments.

- Address is Out of Range (MR or MW commands).

- Wrong # of the characters in the Argument.

4 5 - Attempt to Alter Write Protected Area in the EEPROM. 6 - Proper Command or Argument is not found.

- Wrong value of the Argument.

7 8 - Reserved. 9 - Manufacture specific info EE KEY (wrong key or key is disabled).

9.2 Troubleshooting Guide

No.

Indication

No zero reading after 15 min. warm up time and no flow condition.

Status LED indicator and LCD display remains blank when unit is powered up. No response when flow is introduced from analog outputs 0 to 5 VDC or 4 to 20 mA.

LCD display reading and/or analog output 0 to 5 VDC signal fluctuate in wide range during flow measurement.

LCD display reading does correspond to 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 to 5 Vdc output voltage do correspond to the correct flow range, but 4 to 20 mA output signal does not change (always the same or reading around 4.0 mA).

Calibration is off (more than ±1.0% FS).

LCD display reading is above maximum flow range and output volt age 0 to 5 VDC signal is more than 5.0 VDC when gas flows through the GFM2.

Gas flows through the GFM2, but LCD display reading and the output voltage 0 to 5 Vdc signal do not respond to flow.

Likely Reason

Embedded temperature has been changed. Power supply is bad or polarity is reversed.

PC board is defective. Output 0-5 Vdc signal (pins 2–1 of the Dconnector) is shorted on the GND or overloaded. Output 0 to 5 VDC schematic is burned out or damaged. Analog flow output scale and offset variable are corrupted. External loop is open or load resistance more than 500 Ω. Output 4 to 20 mA schematic is burned out or damaged. GFM2 has initial zero shift.

Sensor under swamping conditions (flow is more than 10% above maximum flow rate for particular GFM2). PC board is defective. The gas flow is too low for particular model of GFM2. GFM2 models: RFE is not connected properly to the inlet fitting. Sensor or PC board is defective.

9. TROUBLESHOOTING

9.1 Common Conditions

our GFM2 Digital Mass Flow Meter was thoroughly checked at numerous quality

ontrol points during and after manufacturing and assembly operations. It was

alibrated according to your desired flow and pressure conditions for a given gas

c or a mixture of gases.

t was carefully packed to prevent damage during shipment. Should you feel that

I 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

re 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?

Solution

Perform Auto Zero Procedure (see section 5.3.6 “Zero Calibration”). Measure voltage on pins 7 and 5 of the 15 pin D-connector. If voltage is out of specified range, then replace power supply with a new one. If polarity is reversed (reading is negative) make correct connection. Return GFM2 to factory for repair. Check external connections to pin 2 – 1, of the D-connector. Make sure the load resistance is more than 1000 Ω.

Return GFM2 to factory for repair.

Restore original EEPROM scale and offset variable or perform analog output recalibration (see section 7.3). Check external connections to pins 2 and 15 of the D-connector. Make sure the loop resistance is less than 500 Ω. Return GFM2 to factory for repair.

Shut off the flow of gas into the GFM2 (ensure gas source is disconnected and no seepage or leak occurs into the meter). Wait for 15 min. with no flow condition and perform Auto Zero calibration Procedure (see section 5.3.7 “Zero Calibration”). Lower the flow through GFM2 within calibrated range or shut down the flow completely. The swamping condition will end automatically.

Return GFM2 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 section 6.2.2). NOTE: Calibration accuracy can be Return GFM2 to factory for repair.

Page 12

Page 13

No.

Indication

Gas does not flow through the GFM2 with inlet pressure applied to the inlet fitting. LCD display reading and output voltage 0 to 5 VDC signal show zero flow.

Gas flows through the GFM2, output voltage 0 to 5 VDC signal does not respond to flow (reading near 1mV).

The Status LED indicator is rapidly flashing with UMBER color on /off.

The Status LED indicator is rapidly flashing with RED color on /off.

The Status LED indicator is rapidly flashing with RED and UMBER colors.

The Status LED indicator is constantly on with the RED light.

9.3 Technical Assistance

Dwyer Instruments will provide technical assistance over the phone to qualified repair personnel. Please have your Serial Number and Model Number ready when you call.

10. 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:

gas

where d = gas density (gram/liter)

Cp= coefficient of specific heat (cal/gram)

Note in the above relationship that d and Cp are usually chosen at the same conditions (standard, normal or other).

d X C

Likely Reason

Filter screen obstructed at inlet.

Direction of the gas flow is reversed.

GFM2 is connected in the installation with back pressure conditions and gas leak exist in the system. Sensor temperature is too low.

Sensor temperature is too high.

MCU temperature is too high (overload).

Fatal Error (EEPROM or Auto Zero error).

Solution

Flush clean or disassemble to remove impediments or replace the filter screen (see section 6.2). 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 GFM2 has internal leak return it to factory for repair.

Make sure the ambient and gas temperatures are within specified range (above 5°C). Make sure the ambient and gas temperatures are within specified range (below 50°C). Disconnect power from the GFM2. Make sure the ambient temperature is within specified range (below 50°C). Let the device cool down for at least 15 min. Apply power to the GFM2 and check Status LED indication. If overload condition will be indicated again the unit has to be returned to the factory for repair. Cycle the power on the GFM2. If Status LED still constantly on with RED light, wait 6 min. and start Auto Zero function (see 5.3.7 Zero Calibration). If after Zero Calibration the Fatal Error condition will be indicated again the unit has to be returned to the factory for repair.

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.

where Qa= mass flow rate of an actual gas

Qr= mass flow rate of a reference gas

Ka= K factor of an actual gas Kr = K factor of a 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 the oxygen is:

= Q

where K = relative K factor to reference gas (oxygen to nitrogen)

NOTICE

computations will be performed internally by MCU.

= Q

If particular K factor is activated via digital interface, the user does not need to perform any conversion. All conversion

(sccm)

x K = 1000 X 0.9926 = 992.6 sccm

Page 13

Page 14

ndication

lankEEPROM

SerialNumber

ModelNumber

SoftwareVer

imeSinceCalHr

ptions1

ackLight

ddressRS485

GasNumber

FlowUnits

AlarmMode

owAlarmPFS

iAlarmPFS

lmDelay

elaySetting

TotalMode

Total

TotalFlowStart

otalVolStop

factorMode

factorIndex

UserDefKfactor

UDUnitKfactor

UDUnitTimeBase

UDUnitDensity

outScaleV

RC_DP

outScale_mA

AoutOffset_mA

SensorZero

Klag [0]

Klag [1]

Klag [2]

Klag [3]

Klag [4]

Klag [5]

Kgain [0]

Kgain [1]

Kgain [2]

Kgain [3]

Kgain [4]

Kgain [5]

Zero_T

Tcor_K

AlarmLatch

TotalWarmDisable

Reserved1

LCD_Diagnostic

Reserved2

N2_RollBack

Reserved3

APPENDIX I

wyer

FM2 EEPROM Variables Rev. A0

as Independent Variables

ata Type

har[10]

c char[20] char[20] char[10]

loat

int

har [4]

c int int char

loat

int

har [4]

c char float float

loat

har

i float float int char

loat

f float uint float float float float float float float float float float float float float float uint char uint char uint char uint

otes

o not modify. Table Revision. [PROTECTED]

D Serial Number [PROTECTED] Model Number [PROTECTED] Firmware Version [PROTECTED]

ime since last calibration in hours

isc. Options

ack Light Level [0-4095]

wo character adress for RS485 only

T Current Gas Table Number [0 - 9] Current Units of Measure [0 - 22] Alarm Mode [‘E’ - Enabled, ‘D’ - Disabled]

ow Flow Alarm Setting [%FS] 0 - Disabled

igh Flow Alarm Setting [%FS] 0 - Disabled

low Alarm Action Delay [0 - 3600 sec] 0 - Disabled

elays Assignment Setting (N, T, H, L, R, M)

R Totalizer Mode [‘E’ - Enabled, ‘D’ - Disabled] Totalizer Volume in %*s (updated every 6 min) Start Totalizer at Flow [%FS] 0 - Disabled

otalizer Action Limit Volume [%*s] 0 - Disabled

-Disabled, I-Internal, U-User Defined

nternal K-Factor Index [0 - 35]

I User Defined K-Factor K-Factor for User Defined Units of Measure User Defined Unit Time Base [1, 60, 3600 sec] User Defined Unit Density Flag [Y, N]

AC 0 to 5 VDC Analog Output Scale

/W DRC DP settings [0-255]

AC 4 to 20 mA Analog Output Scale

D DAC 4-20mA Analog Output Offset DPW value for Sensor Zero [0-1023] DRC Lag Constant [Do Not Alter] DRC Lag Constant [Do Not Alter] DRC Lag Constant [Do Not Alter] DRC Lag Constant [Do Not Alter] DRC Lag Constant [Do Not Alter] DRC Lag Constant [Do Not Alter] Gain for DRC Lag Constant [Do Not Alter] Gain for DRC Lag Constant [Do Not Alter] Gain for DRC Lag Constant [Do Not Alter] Gain for DRC Lag Constant [Do Not Alter] Gain for DRC Lag Constant [Do Not Alter] Gain for DRC Lag Constant [Do Not Alter] Resistance when last AutoZero was done [0-4095 count] Resistance correction coefficient [PFS/count] Alarm Latch [0-3] Sensor Warm Up period Totalizer [D/E] Reserved LCD Diagnostic Mode: [E/D] Flow Reading Averaging: [0,1,2] (100, 250, 1000 ms), Default -1 Back to N2 conversion mode: [E, D] Reserved for Troubleshooting (do not change)

Page 14

Page 15

ndex

ame

100

GasIndentifier

101

FullScaleFlow

StdTemp

tdPressure

tdDensity

alibrationGas

106

CalibratedBy

107

CalibratedAt

DateCalibrated

ateCalibrationDue

_F1

112

_F1

113

SensorTbl[0][Sensor Value]

114

SensorTbl[0][Flow]

SensorTbl[1][Sensor Value]

ensorTbl[1][Flow]

ensorTbl[2][Sensor Value]

118

ensorTbl[2][Flow]

119

SensorTbl[3][Sensor Value]

120

SensorTbl[3][Flow]

121

SensorTbl[4][Sensor Value]

SensorTbl[4][Flow]

ensorTbl[5][Sensor Value]

ensorTbl[5][Flow]

125

ensorTbl[6][Sensor Value]

126

SensorTbl[6][Flow]

127

SensorTbl[7][Sensor Value]

128

SensorTbl[7][Flow]

SensorTbl[8][Sensor Value]

ensorTbl[8][Flow]

ensorTbl[9][Sensor Value]

132

ensorTbl[9][Flow]

133

SensorTbl[10][Sensor Value]

134

SensorTbl[10][Flow]

Note: Values will be available for selected gas only.

NOTICE

K-factors at best are only an approximation. K factors should not be used in applications that require accuracy better than ±5 to 10%.

Index

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

alibration Table

as Dependent Variables

ata Type

char[20] float float

loat

har[20]

char[20] char[20] char[12]

har[12]

loat

f uint float uint

loat

int

loat

f uint float uint float

int

loat

int

u float uint float uint

loat

int

loat

f uint float

Name of Gas [If not calibrated = ‘Uncalibrated’] Full Scale Range in l/min Standard Temperature S G N

If not calibrated = ‘Uncalibrated’]

[ Name of person who performed actual calibration Name of Calibration Facility Calibration Date D G R R Index 0: Must be 120 (zero value) Do not Alter! Index 0: Must be 0.0 (zero PFS) Do not Alter!

10.0% FS A/D Value from Sensor [counts] A 2 A

30.0% FS A/D Value from Sensor [counts] Actual Flow in PFS [0.3]

40.0% FS A/D Value from Sensor [counts] Actual Flow in PFS [0.4] 5 A 6 Actual Flow in PFS [0.6]

70.0% FS A/D Value from Sensor [counts] Actual Flow in PFS [0.7]

80.0% FS A/D Value from Sensor [counts] A 9 A

100.0% FS A/D Value from Sensor [counts] Flow in PFS. Should be 1.0. Do not Alter!

APPENDIX II - Internal “K” Factors

Actual Gas

Acetylene C Air Allene (Propadiene) C Ammonia NH Argon Ar Arsine AsH Boron Trichloride BCl Boron Trifluoride BF Bromine Br Boron Trobromide Br Bromine PentaTrifluoride BrF Bromine Trifluoride BrF Bromotrifluoromethane CBrF 1,3 - Butadiene C4H Butane C4H 1 - Butene C4H 2 - Butene C4H8 CIS 2 - Butene C Carbon Dioxide CO Carbon Disulfide CS Carbon Monoxide C Carbon Tetrachloride CCl Carbon Tetrafluoride (Freon-14) CF Carbonyl Fluoride COF Carbonyl Sulfide COS Chlorine Cl Chlorine Trifluoride CIF Chlorodifluoromethane (Freon-22) CHCIF Chloroform CHCl Chloropentafluoroethane (Freon-115) C2CIF Chlorotrifluromethane (Freon-13) CCIF Cyanogen C2N Helium He Hydrogen H Hydrogen H2(> 100 L/min) Oxygen O

2H2

3H4

4H8

TRANS

Page 15

otes

tandard Pressure

as Standard Density ame of Gas used for Calibration

ate Calibration Due as Parameters: K-factor relative to N eserved

eserved

ctual Flow in PFS [0.1]

0.0% FS A/D Value from Sensor [counts] ctual Flow in PFS [0.2]

0.0% FS A/D Value from Sensor [counts] ctual Flow in PFS [0.5]

0.0% FS A/D Value from Sensor [counts]

ctual Flow in PFS [0.8]

0.0% FS A/D Value from Sensor [counts] ctual Flow in PFS [0.9]

Density

Cp (Cal/g)

.4036 .240 .352 .492 .1244 .1167 .1279 .1778 .0539 .0674 .1369 .1161 .1113 .3514 .4007 .3648 .336 .374 .2016 .1428 .2488 .1655 .1654 .1710 .1651 .114 .1650 .1544 .1309 .164 .153 .2613

1.241

3.419

3.419 .2193

(g/l)

1.162

1.293

1.787 .760

1.782

3.478

5.227

3.025

7.130

11.18

7.803

6.108

6.644

2.413

2.593

2.503

1.964

3.397

1.250

6.860

3.926

2.945

2.680

3.163

4.125

5.326

6.892

4.660

3.322 .1786 .0899 .0899

1.427

K-Factor Relative to N

.5829

1.0000 .4346 .7310

1.4573 .6735 .4089 .5082 .8083 .38 .26 .3855 .3697 .3224 .2631 .2994 .324 .291 .7382 .6026

1.00 .31 .42 .5428 .6606 .86 .4016 .4589

.3912 .2418

.3834 .61

1.454

1.0106

1.92 .9926

Page 16

OTICE

PPENDIX III - Gas Factor Table (“K Factors”)

-factors at best are only an approximation. K factors should not be used in applications that require accuracy better than ±5 to 10%.

Density

Index

ctual Gas

Acetylene C

Air

Allene (Propadiene) C

mmonia NH

rgon Ar (<= 10 L/min)

rgon AR-1 (>= 10 L/min)

rsine AsH

Boron Trichloride BCl

Boron Trifluoride BF

Bromine Br

oron Trobromide Br

romine PentaTrifluoride BrF

romine Trifluoride BrF

romotrifluoromethane (Freon-13 B1) CBrF

1,3 - Butadiene C4H

Butane C4H

- Butene C

Carbon Dioxide CO Carbon Dioxide CO

Carbon Disulfide CS

Carbon Monoxide C0

arbon Tetrachloride CCl

arbon Tetrafluoride (Freon-14) CF

Carbonyl Fluoride COF

Carbonyl Sulfide COS

hlorine Cl

hlorine Trifluoride CIF

hlorodifluoromethane (Freon-22) CHCIF

Chloroform CHCl

Chloropentafluoroethane (Freon-115) C2CIF

Chlorotrifluromethane (Freon-13) CCIF

Cyanogen C2N

Cyanogen Cloride CICN

Cyclopropane C

Deuterium D

Diborane B2H

Dibromodifluoromethane CBr2F

Dichlorodifluoromethane (Freon-12) CCl2F

Dichlofluoromethane (Freon-21) CHCl2F

Dichloromethylsilane (CH

Dichlorosilane SiH2Cl

Dichlorotetrafluoroethane (Freon-114) C2Cl2F

1,1-Difluoroethylene (Freon-1132A) C2H2F

Dimethylamine (CH3)2NH

Dimethyl Ether (CH

2,2-Dimethylpropane C

Ethane C2H

Ethanol C2H6O

Ethyl Acetylene C

Ethyl Chloride C2H5Cl

Ethylene C

Ethylene Oxide C2H4O

Fluorine F

Fluoroform (Freon-23) CHF

Freon-11 CCl3F

Freon-12 CCl

Freon-13 CClF

Freon-13B1 CBrF

Freon-14 CF

Freon-21 CHCl2F

Freon-22 CHClF

Freon-113 CCl2FCClF

Freon-114 C2Cl2F

Freon-115 C2ClF

Freon-C318 C4F

Germane GeH

Germanium Tetrachloride GeCl

Helium He (<50 L/min)

2H2

3H4

2H4

4H8

2F2

RANS

(<10 L/min)

-1 (<10 L/min)

3H5

3)2

4H6

3)2

3H12

Helium He-1 (>50 L/min) Helium He-2 (>10-50 L/min)

SiCl

-Factor

elative to N

.5829

1.0000 .4346

7310

.4573

.205

6735

. .4089 .5082 .8083

3855

3697

.3224 .2631

2994

324

291

. .7382 .658 .6026

1.00 31

. .5428 .6606

4016

4589

.3912 .2418

.3834

.61 .6130 .4584

1.00

.4357

.1947 .3538

.4252 .2522 .4044 .2235

.4271

.3714 .3896 .2170 .50 .3918 .3225 .3891 .60 .5191 .9784 .4967 .3287 .3538 .3834 .3697 .4210 .4252 .4589 .2031 .2240 .2418 .1760 .5696

.2668

1.454

2.43

2.05

g/l)

(

Cal/g)

(

.4036 .240 .352

492

1244

1167

. .1279 .1778 .0539

0647

1369

1161

1113

. .3514 .4007

3648

336

374

. .2016 .2016 .1428 .2488

1655

1654

. .1710 .1651

114

1650

1544

. .1309 .164 .153 .2613 .1739 .3177

1.722 .508 .15 .1432 .140 .1882 .150 .1604 .224 .366 .3414 .3914 .420 .3395 .3513 .244 .365 .268 .1873 .176 .1357 .1432 .153 .1113 .1654 .140 .1544 .161 .160 .164 .185 .1404 .1071

1.241

.162

.293

.787

1 .760

1.782

1.782 .478

.227

.025

.130

11.18

7.803

6.108 .644

.413

.593

2.503

1.964 .964

.397

.250

6.860

3.926

2.945

2.680 .163

.125

.858

5.326

6.892

4.660

2.322

2.742

1.877

1.799

1.235

9.362

5.395

4.592

5.758

4.506

7.626

2.857

2.011

2.055

3.219

1.342

2.055

2.413

2.879

1.251

1.965

1.695

3.127

6.129

5.395

4.660

6.644

3.926

4.592

3.858

8.360

7.626

6.892

8.397

3.418

9.565

.1786 .1786 .1786

Page 16

Page 17

Actual Gas

Index

Hexafluoroethane C

Hexane C

Hydrogen H2-1 (<10-100 L)

Hydrogen H Hydrogen H Hydrogen Bromide HBr

Hydrogen Chloride HCl

Hydrogen Cyanide HCN

Hydrogen Fluoride HF

Hydrogen Iodide HI

Hydrogen Selenide H

Hydrogen Sulfide H

Iodine Pentafluoride IF

Isobutane CH(CH3)

Isobutylene C4H

Krypton Kr

Methane CH

Methane CH Methanol CH

Methyl Acetylene C3H

Methyl Bromide CH2Br

Methyl Chloride CH

Methyl Fluoride CH

Methyl Mercaptan CH

Methyl Trichlorosilane (CH

Molybdenum Hexafluoride MoF

Monoethylamine C2H5NH

Monomethylamine CH3NH

Neon NE

Nitric Oxide NO

Nitrogen N

Nitrogen Dioxide NO

Nitrogen Trifluoride NF

Nitrosyl Chloride NOCl

Nitrous Oxide N

Octafluorocyclobutane (Freon-C318) C

100

Oxygen O

101

Oxygen Difluoride OF

102

Ozone

103

Pentaborane B

104

Pentane C5H

105

Perchloryl Fluoride ClO3F

106

Perfluoropropane C

107

Phosgene COCl

108

Phosphine PH

109

Phosphorous Oxychloride POCl

110

Phosphorous Pentafluoride PH

111

Phosphorous Trichloride PCl

112

Propane C3H

113

Propylene C3H

114

Silane SiH

115

Silicon Tetrachloride SiCl

116

Silicon Tetrafluoride SiF

117

Sulfur Dioxide SO

118

Sulfur Hexafluoride SF

119

Sulfuryl Fluoride SO2F

120

Tetrafluoroethane (Forane 134A) CF3CH2F

121

Tetrafluorohydrazine N2F

122

Trichlorofluoromethane (Freon-11) CCl3F

123

Trichlorosilane SiHCl

124

1,1,2-Trichloro-1,2,2 Trifluoroethane

125

6H14

-2 (>10-100 L)

-3 (>100 L)

(<=10 L/min)

-1 (>=10 L/min)

(Freon-113) CCl2FCClF Triisobutyl Aluminum (C4H9)AL

126

Titanium Tetrachloride TiCl

127

Trichloro Ethylene C2HCl

128

Trimethylamine (CH3)3N

129

Tungsten Hexafluoride WF

130

Uranium Hexafluoride UF

131

Vinyl Bromide CH2CHBr

132

Vinyl Chloride CH2CHCl

133

Xenon Xe

134

5H9

2F6

3F8

(Freon-116)

6 2

K-Factor Relative to N

.2421 .1792

1.0106

1.35

1.9

1.000

1.000 .764 .9998 .9987 .7893 .80 .2492 .27 .2951

1.453 .7175 .75 .5843 .4313 .5835 .6299 .68 .5180

)SiCl

.2499 .2126 .3512 .51

1.46 .990

1.000 .737 .4802 .6134 .7128 .176

4F8

.9926 .6337 .446 .2554 .2134 .3950 .174 .4438 .759

.36 .3021 .30 .35 .40 .5982

.284 .3482 .69 .2635 .3883 .5096

.3237 .3287 .3278 .2031

.0608

.2691 .32 .2792 .2541 .1961 .4616 .48

1.44

Cp (Cal/g)

.1834 .3968

3.419

3.419 .0861 .1912 .3171 .3479 .0545 .1025 .2397 .1108 .3872 .3701 .0593 .5328 .5328 .3274 .3547 .1106 .1926 .3221 .2459 .164 .1373 .387 .4343 .246 .2328 .2485 .1933 .1797 .1632 .2088 .185 .2193 .1917 .195 .38 .398 .1514 .197 .1394 .2374 .1324 .1610 .1250 .399 .366 .3189 .1270 .1691 .1488 .1592 .1543 .127 .182 .1357 .1380 .161

.508 .120 .163 .3710 .0810 .0888 .1241 .12054 .0378

Density (g/l)

6.157

3.845 .0899 .0899 .0899

3.610

1.627

1.206 .893

5.707

3.613

1.520

9.90

3.593

2.503

3.739 .715 .715

1.429

1.787

4.236

2.253

1.518

2.146

6.669

9.366

2.011

1.386 .900

1.339

1.25

2.052

3.168

2.920

1.964

8.397

1.427

2.406

2.144

2.816

3.219

4.571

8.388

4.418

1.517

6.843

5.620

6.127

1.967

1.877

1.433

7.580

4.643

2.858

6.516

4.562

4.224

4.64

6.129

6.043

8.36

8.848

8.465

5.95

2.639

13.28

15.70

4.772

2.788

5.858

Page 17

Page 18

PPENDIX IV - Component Diagram

op Component Side

Bottom Component Side

Page 18

Page 19

APPENDIX V

Dimensional Drawings

NOTES: Dwyer reserves the right to change designs and dimensions at its sole discretion at any time without notice. For certified dimensions please contact Dwyer.

APPENDIX VI MAINTENANCE/REPAIR

WARRANTY/RETURN

Page 19

Page 20

DWYER INSTRUMENTS, INC.

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

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]