Meriam M2110F User Manual

9R142 Dated 2/1/11

The Battery model is powered by its internal lithium batteries. This model does not provide any
outputs or RS-232 communications.

SetPoint and Current Loop models have outputs that can be used for control or indicating
functions. Both models also have RS-232 communications capability. In addition to configuring
the gauge, the RS-232 port can be used to monitor and log the measured flow data and output
status. It can also be used as part of a control system with digital capabilities.

The SetPoint model provides two relay outputs. These relays can be connected in normally open
or normally closed configurations for fail-safe operation. SetPoint detection can be set from 0 to
+120% of the full scale flow range and is powered by 115VAC, 230 VAC, or 24VDC.

The Current Loop model provides a 4 to 20 mA output, and is intended to be used as a flow
transmitter on a three or four wire loop. Zero and span are set through user-programmable
registers, from 0 to +120% of the full scale flow range. The Current Loop model is powered by
24VDC only.

M2110F SMART FLOW GAUGE

OPERATING INSTRUCTIONS

Meriam’s M2110F Smart Flow Gauge is a
microprocessor-based pressure sensing
device with algorithms to calculate flow.
The gauge provides laminar flow element,
Accutube and Orifice Plate flow
measurements. Three configurations are
available: Battery, SetPoint, and Current
Loop models.

All models are programmable through the
front keypad. The user’s program
information is stored in non-volatile
memory, and is retained when the power
to the gauge is removed. SetPoint and
Current Loop models can also be
programmed through the RS-232 serial
communication connection.

1

Table of Contents

1 OVERVIEW.......................................................................................................................................................4

1.1 FEATURES ...................................................................................................................................................4

1.2 MODELS ......................................................................................................................................................4

1.3 FLOW CALCULATION MODEL......................................................................................................................4

1.3.1 Laminar Flow element...........................................................................................................................4

1.3.2 Accutube or Orifice Plate element.........................................................................................................4

2 SAFETY WARNINGS.......................................................................................................................................5

3 CERTIFICATION / SAFETY / WARNINGS.................................................................................................6

4 FRONT PANEL.................................................................................................................................................7

4.1 FLOW METER DISPLAY .........................................................................................................................7

4.1.1 Indicators...............................................................................................................................................7

4.1.2 Display Refresh Rate ............................................................................................................................. 8

4.1.3 Display Resolution.................................................................................................................................8

4.2 KEYPAD OPERATIONS ..........................................................................................................................8

4.2.1 ON/OFF or BACKSPACE.....................................................................................................................8

4.2.2 ENGINEERING UNITS or UP ARROW...............................................................................................9

4.2.3 BACKLIGHT or DOWN ARROW..........................................................................................................9

4.2.4 PRGM or ENTER ................................................................................................................................10

4.2.5 ZERO FUNCTION...............................................................................................................................10

5 PROGRAMMING...........................................................................................................................................11

5.1 PROGRAMMABLE REGISTER LIST ...................................................................................................12

6 STARTUP REQUIREMENTS.......................................................................................................................13

6.1 POWER-UP SEQUENCE...............................................................................................................................13

6.2 POWER-UP ERROR CONDITIONS................................................................................................................13

6.2.1 Register Range Errors.........................................................................................................................13

6.2.2 Non-Register Data errors....................................................................................................................13

6.3 MEASUREMENT MODEL ............................................................................................................................13

6.4 LOW FLOW CUTOFF..................................................................................................................................14

6.5 B COEFFICIENT/FLOW CONSTANT.............................................................................................................14

6.6 C COEFFICIENT.......................................................................................................................................... 14

6.7 ZERO FLOW REFERENCE ...........................................................................................................................14

7 ZERO REFERENCE.......................................................................................................................................14

7.1 AFFECT ON OUTPUTS..........................................................................................................................14

7.1.1 RE-ZEROING THE GAUGE / OUTPUTS DISABLED (P5= 0): .........................................................14

7.1.2 RE-ZEROING THE GAUGE / OUTPUTS ENABLED (P5=1, 2 or 3):...............................................15

7.2 FACTORY ZERO....................................................................................................................................15

7.3 RANGE CHECK......................................................................................................................................15

8 ENGINEERING UNITS..................................................................................................................................16

8.1 CHANGING ENGINEERING UNITS.....................................................................................................16

9 PROGRAMMABLE REGISTERS................................................................................................................17

9.1 P0 – LOCKOUT CODE............................................................................................................................17

9.2 P1 – SHUTOFF TIMER...........................................................................................................................17

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9.3 P2- DISPLAY DAMP RATE...................................................................................................................18

9.4 P3 – MEASUREMENT MODEL.............................................................................................................18

9.5 P4 – LOW FLOW CUTOFF..................................................................................................................... 19

9.6 P5 – SETPOINT OPTIONS......................................................................................................................20

9.7 P6 AND P7 – SETPOINT (SET1 AND SET2).............................................................................................20

9.7.1 Setpoint Model.....................................................................................................................................20

9.7.2 Current Loop Model............................................................................................................................20

9.7.3 Data Entry ...........................................................................................................................................21

9.7.4 Scaling Dependency.............................................................................................................................21

9.8 P8 – DEADBAND....................................................................................................................................22

9.9 P9 – FLOW MEASUREMENT B-COEFFICIENT..................................................................................23

9.10 P10 – FLOW MEASUREMENT C-COEFFICIENT................................................................................24

10 REGISTER SECURITY .................................................................................................................................25

10.1 DESCRIPTION........................................................................................................................................25

10.2 VIEW-ONLY STATUS ...........................................................................................................................25

11 SERIAL PORT SERVICE..............................................................................................................................26

11.1 THE MENU..............................................................................................................................................26

11.2 ACCESSING THE MENU.......................................................................................................................26

11.3 IMPACT ON OPERATION.....................................................................................................................26

11.4 TIMEOUT................................................................................................................................................27

11.5 DATA MONITORING ............................................................................................................................27

11.6 LOCKOUT...............................................................................................................................................27

12 ERROR CODES ..............................................................................................................................................28

13 SUPPLEMENTARY INFORMATION.........................................................................................................29

13.1 APPLICATION EXAMPLE ............................................................................................................................29

13.1.1 Laminar flow element......................................................................................................................29

13.1.2 Accutube/Orifice Plate flow element...............................................................................................29

13.2 MAINTENANCE..........................................................................................................................................29

13.2.1 Battery Model Smart Gauge............................................................................................................29

14 INSTALLATION.............................................................................................................................................30

14.1 ELECTRICAL CONNECTIONS.............................................................................................................31

14.1.1 Power Supply Options.....................................................................................................................31

14.1.2 Setpoint Model Interface Connections............................................................................................31

14.2 CURRENT LOOP MODEL WIRING......................................................................................................32

14.2.1 Current Loop Model Interface Connections ...................................................................................32

14.3 OUTLINE DIMENSIONS .......................................................................................................................33

14.3.1 Panel Mounting...............................................................................................................................33

15 PRODUCT SPECIFICATIONS.....................................................................................................................34

16 SERVICE AND CALIBRATION...................................................................................................................36

3

1 OVERVIEW

The Meriam Instrument M2110F Gauge is a microprocessor based flow-sensing device that can be used in
conjunction with a primary flow element to measure flow rate of clean dry gases. Compatible primary elements
include Laminar Flow Elements (LFE), Accutube and Orifice plates. The gauge operates on the principle of
measuring differential pressure across the primary element then calculating the flow rate based on user scaling input.
The calculated flow rate is then displayed in the selected engineering unit or output for process control or
monitoring.

1.1 Features

• Microprocessor –control for reliability and flexibility

• Remote control via RS232 serial link using ASCII character transfer

• Parameters to allow easy configuration of the unit

• Built-in non-volatile memory for storing register settings

• 4-½ digit LCD display with backlight for flow readout

1.2 Models

• Battery Powered Display Indicator only

• Current Loop Model with 4-20 mA Flow Rate Output and RS232 serial interface port

• 10 inH

• AC powered models have an RS232 serial interface port and SPDT outputs

1.3 Flow Calculation Model

O sensors available

2

1.3.1 Laminar Flow element

Flow = B_Coefficient * dP + C_Coefficient * dP
Where: dP = Differential pressure (inH

B-Coefficient and C-Coefficient are provided with the LFE

1.3.2 Accutube or Orifice Plate element

Flow = Flow Constant * √dP
Where: dP = Differential pressure (inH

O @ 4 ºC)

2

O @ 60 ºF)

2

2

Warning

The user must scale the gauge for the correct flow measurement display by entering the proper values of the
Measurement Model, B-Coefficient, C-Coefficient and or Flow Constant.

4

2 Safety Warnings

The table below defines the safety symbols, signal words and corresponding safety messa ges used in the
manual to identify potential hazards and are intended to warn persons about hazards that could result in
personal injury or equipment damage.

This is the Read Instruction Manual symbol. This symbol indicates
h that you must read the instruction manual.

This is the Safety Alert symbol. This symbol indicates a WARNING.
Warnings alert you to actions that can cause personal injury or pose a
physical threat. Please read these carefully.

This is the Safety Glasses symbol. This symbol indicates that you must
wear approved safety glasses during the task.

This is the Safety Gloves symbol. This symbol indicates that you must
wear approved safety gloves during the task.

Indicates a potentially hazardous situation which, if not
avoided, will result in death or serious injury.

Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.

Indicates a potentially hazardous situation which, if not
avoided, could result in minor or moderate injury.

Indicates information essential for proper product
installation, operation or maintenance.

Information in this document is subject to change without notice. Check the Meriam web site
(www.meriam.com

For customer assistance please call your local Meriam representative or Meriam directly.

) for the latest manual revision.

Meriam Process Technologies

10920 Madison Avenue

Cleveland, Ohio 44102

Telephone: [phone]

Fax: [phone]

E-mail: [e-mail]

Web: www.meriam.com

5

3 Certification / Safety / Warnings

Fire/Explosion Hazard. This instrument is not intrinsically safe. DO NOT use or
service in areas that may contain flammable gas or vapors, combustible dusts or

ignitable fibers where an unintended spark can cause a fire/explosion.

Do not exceed the Pressure Limits listed in the Specifications section of this
manual. Failure to operate within the specified pressure limit could result in

death or serious injury.

 Do not exceed the Maximum Input Voltage listed under “Input Power” in the Specification section
of this manual

 Do not exceed the Switch Rating listed under “I/O” in the Specifications section of this manual.
 Disconnect power before servicing.
 Substitution of components may impair operation and safety.

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4 FRONT PANEL

Warning

All settings must only be entered by qualified personnel, paying particular attention to the safety and precautionary
warnings. Changes to the register settings may cause incorrect flow rate display values.

4.1 FLOW METER DISPLAY

4.1.1 Indicators

When the gauge is in the normal measurement mode of operation it will display the Flow Rate, Engineering Unit
and Time Base on the LCD display. The top of the display will show the following possible status indicators:

PRGM, SET1/SET2 or 4-20mA, which will be described below.

PRGM:

When the gauge is in Program Mode the display will illuminate the PRGM indicator, which prom pt s the user for
further keypad entry data.

SET1/SET2:
The SetPoint models will illuminate the SET1 or SET2 indicators to show active level sensing relay outputs. This
indicator is also used to indicate that the register that is being edited is used to configure the relay level sensing
function. These configuration registers include P5, P6 and P7 for the M2110F Relay Output Model.

4-20mA:
The Current Loop models will display the 4-20mA indicator when the 4-20 mA analog output is enabled or when
the user is editing the 4-20mA configuration register. These configuration registers include P5, P6, and P7 for the
M2110F Analog 4-20mA Output Model.

Decimal Point:
The decimal point is used to indicate the status of the Low Flow CutOff detection. If the Low Flow CutOff is active
the display will show a flashing decimal point.

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4.1.2 Display Refresh Rate

/ O

The M2110F Flow gauge converts signal data from the differential pressure sensor at a rate of ten conversions per
second depending on the operating mode of the gauge

. The display is then refreshed at a rate of approximately three

updates per second with a value that can be filtered by a user selectable time constant.

Note: All internal calculations, analog and contact outputs, and serial interface values are updated at the maximum
sampling rate.

4.1.3 Display Resolution

The differential pressure sensor range and the A/D conversion hardware in the device define the display resolution.
Note that since the Flow Gauge display is user-scaled to flow units, the full scale and resolution depends on the
calibration scaling. If a specific value will not fit on the 4½-digit display the auto-range feature will decrease the
resolution to allow the display value to fit the available digits.

4.2 KEYPAD OPERATIONS

The front panel keypad incorporates multifunction keys where the functionality will depend on the mode of
operation of the gauge.

• Measure Mode is the normal operating display mode of the gauge. This mode is always default after

power-up or reset.

• Program Mode is used to configure the gauge for operation. A PRGM indicator on the display denotes

this mode.

4.2.1 ON/OFF or BACKSPACE

Mode of
Operation

ON

Document Symbol: (Backspace←)

FF

Measure Mode

• Battery models: Toggles the gauge ON and OFF.

• SetPoint and Current Loop models: “Resets” the gauge.

Program Mode Backspace function:

Program Mode (P# displayed): backspace key will exit to Measure Mode.
Data Edit Mode: Backspace key is used to abort edit operation and exit the register

without making any changes.
Note:

When editing a multi-digit value, each backspace key press will backup one digit, until
finally exiting the register.

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4.2.2 ENGINEERING UNITS or UP ARROW

Mode of
Operation

ENG

UNITS

Document Symbol: (Up↑)

Measure Mode No function in this mode. Will generate error code if pressed.
Program Mode

Program Mode (P# displayed): Scrolls up through the available programmable
registers.

Data Edit Mode: This key allows editing the register value by increasing the value of
the flashing digit.

As part of the P9 editing process the Engineering Unit selection can be changed. While
changing the units the current unit indicator remains solid, and the newly selected unit
indicator will flash. Scrolling through the available units is done by pressing the Up↑ or
Down↓ keys. The flashing unit is selected using the PRGM/ENTER→ key, or the
process may be aborted by using the Backspace← key.

4.2.3 BACKLIGHT or DOWN ARROW

Mode of
Operation

Document Symbol: (Down↓)

Measure Mode Toggles the display Backlight on and off. Note that the default Backlight status for the

Battery model is OFF to conserve battery life. The other models will retain the prior
Backlight status as default.

Program Mode

Program Mode (P# displayed): Scrolls down through the available programmable
registers.

Data Edit Mode: This key allows editing the register value by decreasing the value of
the flashing digit.

As part of the P9 editing process the Engineering Unit selection can be changed. While
changing the units the current unit indicator remains solid, and the newly selected unit
indicator will flash. Scrolling through the available units is done by pressing the Up↑ or
Down↓ keys. The flashing unit is selected using the PRGM/ENTER→ key, or the
process may be aborted by using the Backspace← key.

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4.2.4 PRGM or ENTER

Mode of
Operation

Measure Mode Selects Program Mode, which allows access to the programmable registers P0-P10.
Program Mode Program Mode (P# displayed): Opens the selected register for editing.

PRGM

Data Edit Mode: When the desired value is selected, pressing the PRGM/ENTER→
key accepts and stores the value.

When editing a multi-digit value, each key press will accept the current digit and proceed
to the next until finally accepting the complete value and closing the register.

Document Symbol: (PRGM/Enter→)

4.2.5 ZERO FUNCTION

Mode of
Operation

Measure Mode

ENG

UNITS

+

In Measure Mode, pressing the Up↑ and Down↓ keys at the same time resets the zero
reference of the gauge (see page 16).

Document Symbol: (Up↑ and Down↓)

Program Mode In Program Mode, for convenience, this function will reset to P0.

Program Mode (P# displayed): Function will reset the register index to P0.
Data Edit Mode: After opening a register for editing, this function will reset the

register’s data value to default.
Note that even when using this “reset” function, the PRGM/Enter→ key must be

pressed to accept the new value. This allows for further editing after reset of the value.

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5 PROGRAMMING

IMPORTANT:

Programmable registers above P0 cannot be adjusted unless the correct lockou t code is entered or the lockout code is
disabled.

PROGRAM MODE ACCESS

no

[1] [2] [3] [5] [6] [8]

yes no no

yes
yes

Notes

[1] Enter program register selection mode
[2] Select register number to change
[3] View the value of the register currently selected
[4] Do you want to change the value? If not go to [6]
[5] Increase or decrease the value of the blinking digit, enter PRGM after each digit adjustment is made
[6] After modifying the final digit, PRGM will “store” the new value into memory
[7] Do other programmable registers need to be changed? If so, return to [2]
[8] Exit the program select mode and return to measurement display mode

Key Functions
Backspace : This key can be used to abort data entry and escape back to the measure mode display
Program : Enters data for storage or mode change
Up Arrow : Increments menu selections or digits being edited
Down Arrow : Decrements menu selections or digits bein g edi t e d

Press
Prgm

Press

Press
Prgm

[4]
Change

?

Press

Press
Prgm

[7]
Change

?

Press
ON/
OFF

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