Meriam M2110L User Manual

9R143 Dated 3/2011

M2110L SMART LEVEL GAUGE

OPERATING INSTRUCTIONS

The Battery model is powered by its internal lithium batteries only. 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/recording 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
level/pressure data and output status. It can also be used as part of a control system with digital
capabilities.

The SetPoint model provides two SPDT relay outputs with adjustable deadband. This
configuration provides normally open or normally closed contact operation for fail-safety.
Switching SetPoint can be set from 0 to +120% of the full scale level/pressure range. The
SetPoint model is powered by 115/230 VAC, or 24VDC.

The Current Loop model provides a 4 to 20 mA output, and is intended to be used as a level
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 pressure range. The output is capable of normal and
reverse action. The Current Loop model is powered by 24VDC only.

Meriam’s M2110L Smart Level Gauge is
a microprocessor-based pressure sensing
device with algorithms to calculate level.
The various sensors provide dip- tube
bubbler accommodation, or direct head
level measurements. Three config­urations are available: Battery, SetPoint,
and Current Loop models.

All models are programmable through the
front keypad, to allow configuration of
the gauge. 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
configured through the RS-232 serial
communication connection.

i

9R143 Dated 3/2011

Table of Contents

LEVEL DISPLAY.......................................................................................................................... 1

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

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

KEYPAD FUNCTIONS:................................................................................................................ 4

PROGRAMMABLE REGISTER OVERVIEW ............................................................................ 6

PROGRAMMABLE REGISTER QUICK REFERENCE............................................................. 6

ENGINEERING UNITS................................................................................................................. 7

ZERO REFERENCE................................................................................................................. ..... 8

P0 – LOCKOUT CODE ................................................................................................................. 9

P1 – TIMEOUT VALUE.............................................................................................................. 10

P2 – DAMP RATE ....................................................................................................................... 11

P3 – RESIDUAL HYDROSTATIC PRESSURE......................................................................... 12

P4 – FULL TANK HYDROSTATIC PRESSURE ......................................................................14

P5 – SETPOINT OPTIONS.......................................................................................................... 15

P6 and P7 – SETPOINT (SET1 and SET2)................................................................................. 16

P8 – DEADBAND........................................................................................................................ 17

P9 – TANK CYLINDRICAL CAPACITY.................................................................................. 18

P10 – TANK ENDS CAPACITY................................................................................................. 19

P11 – TANK TYPE......................................................................................................................20

LOCKOUT CODE PROMPT....................................................................................................... 21

SERIAL PORT SERVICE............................................................................................................ 22

ERROR CODES........................................................................................................................... 24

INSTALLATION AND WIRING................................................................................................ 25

PRODUCT SPECIFICATIONS................................................................................................... 28

SERVICE & CALIBRATION...................................................................................................... 30

ii

9R143 Dated 3/2011

LEVEL DISPLAY

Indicators

During normal operation, the gauge displays the level value in large numerals, and the bottom of the

display shows the current Engineering Unit. The top of the display will show PRGM when the gaug e is in

Program Mode (flashing when “view only”). For SetPoint models, the top of the display will show
SET1/SET2 to indicate activated outputs (or corresponding register opened in Program Mode). For

Current Loop models, the top of the display will show 4-20mA when the output is enabled (or
corresponding register opened in Program Mode).

Performance

The M2110L Smart Level Gauge retrieves analog data from its pressure sensor, and performs an analog-to-

digital (A/D) conversion for microprocessor-based data handling. The rate of A/D conversion will
typically be between 9 to 13 conversions per second, depending on the various operating conditions.

To make the display easier to read, only every fourth sample is updated on the display. (This results in a

display update rate of about 3 updates per second.) The internal calculations, outputs, and serial interface
are updated at the full conversion rate.

Resolution

The Smart Gauge has a 4½ digit display. The resolution of the data (decimal point positioning) is defined

by the range and sampling process. The resultant full scale display and data resolution is summarized in
the table below. Note that since the Smart Level Gauge display is primarily user-scaled to level units, the
full scale and resolution depends on the scale. If a specific value will not fit on the 4½ digit display,
however, the auto-range feature will decrease the resolution to allow the value to fit the display (for
example, increasing past 199.99 becomes 200.0). The auto-range feature restores the decimal resolution
with a built-in deadband of 5 display counts (for example, 200.0 must drop to 199.95 before the two-digit
decimal resolution is restored).

Note that the full scale display indication during power-up will not necessarily have the same decimal

resolution found during actual level monitoring.

1

9R143 Dated 3/2011

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 di.0

) 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

2

9R143 Dated 3/2011

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.

3

9R143 Dated 3/2011

/

KEYPAD FUNCTIONS:

The keys on the front panel perform multiple functions. Their function differs depending on whether the gauge is in
Measure Mode or Program Mode.

• Measure Mode is the normal operating mode for measuring and displaying level. This mode is always

default after power-up or reset.

• Program Mode is used to configure the various options of the gauge. This mode is denoted by a PRGM

indicator on the display.

ON/OFF /
Backspace Key

ON

Document Symbol: (Backspace←)

OFF

Measure Mode

Program Mode

ENG UNITS/Up
Arrow Key

Measure Mode

• Battery models: Toggles the gauge ON and OFF.

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

Sequence of power-up or reset

1. Display test is performed (all segments of the LCD display are turned on).

2. Firmware revision is displayed.

3. Full scale (programmed level) is displayed in the last Engineering Unit used.

4. All prior register values are restored and activated.

5. Measure Mode displays level in the last Engineering Unit used.

Backspace function:
From Program Mode, this key will exit to Measure Mode.
When editing a register, this key is used to abort a programming operation and exit the

register without making any changes.
When editing a multi-digit value, each key press will backup one digit, until finally

exiting the register.

ENG

UNITS

Document Symbol: (Up↑)

Allows the Engineering Units to be changed (see page 7). During Engineering Unit
selection, the current unit indicator remains solid, and the “new” unit indicator is
flashing. 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.

Program Mode

(and EU Selection)

Scroll up function. Scrolls up through the available programmable registers. Once a
register is opened, this key allows editing by scrolling up through the values in the
register.

Backlight/Down
Arrow Key

Measure Mode

Program Mode

(and EU Selection)

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.

Scroll down function. Scrolls down through the available programmable registers. Once
a register is opened, this key allows editing by scrolling down through the values in the
register.

Document Symbol: (Down↓)

4

9R143 Dated 3/2011

PRGM/Enter Key
Measure Mode

(and EU Selection)

Program Mode

Re-ZERO Key

Measure Mode

Program Mode

(and EU Selection)

PRGM

Selects Program Mode, which allows access to the programmable registers. This key is
also used to accept a new Engineering Unit selection.

Opens the selected programmable register for editing.
When the desired value is displayed, pressing the PRGM/Enter→ key accepts and

stores the value, and closes the register.
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.

ENG

UNITS

In Measure Mode, pressing the Up↑ and Down↓ keys at the same time resets the zero
reference of the gauge (see page 8).

In Program Mode, for convenience, this function will reset the current value to default.
For example, in Program Mode (but before opening a register), this function

Document Symbol: (PRGM/Enter→)

Document Symbol: (Up↑ and Down↓)

+

will reset the register scroll to P0.

After opening a register for editing, this function will reset the register’s data

value to default (typically 0).

Similarly, when selecting a new Engineering Unit, this function will reset the

selection to the first unit (gallons).

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).

5

9R143 Dated 3/2011

PROGRAMMABLE REGISTER OVERVIEW

All M2110L Smart Level Gauges have programmable registers that allow the gauge to be configured to fit the level
measurement application. Programmable registers are numbered P0 through P11. Each register con tro ls a specific
aspect of the gauge’s performance.

Beginning on page 9 is a description of all programmable registers, and instructions for their use. Each register is
found on all M2110L Smart Level Gauge models, and performs the same function described for all models, except
as noted otherwise.

Px
P0

P1

P2

P3

P4

P5

PROGRAMMABLE REGISTER QUICK REFERENCE

Name Description Value Range Notes

Lockout Code Lockout for security. 00 to 99 00 = Disabled.
Timeout Automatic shutoff in minutes of keypad

inactivity.

Damp Rate Exponential damping time in seconds. 0.1, 0.2, 0.5, 1, 2, 5,

Residual
Hydrostatic
Pressure

Full Tank
Hydrostatic
Pressure

SetPoint Options

Identifies the unmeasured or added
hydrostatic pressure due to piping
configurations.

The pressure created by a full column
of fluid from the floor of the tank to the
top of the maximum level measured.

SetPoint Model: defines which relay
outputs are active.

Current Loop Model: defines the status
of the 4 - 20 mA output.

0 (disabled), 1, 2, 5,
10, 15, 25

10, 15, 25, 50

-9,999 to +9,999
O @ 20ºC.

inH

2

0 to 9,999 (Keypad)
0 to 19,999 (Serial)

0 = Disabled.
1 = SET1 only.
2 = SET2 only.
3 = Both enabled.

0 = 4-20 disabled
1 = 4-20 enabled

Battery model only.

0.1 = No Damping.

+Val: Dip Tube

- Val: Direct Head

Pressure in inH
@20°C.

Not found on
Battery model.

O

2

P6
P7
P8

P9

P10

P11

SET1 Controls SET1 relay or 4.00 mA value. –20% to +120% FS User defined value.
SET2 Controls SET2 relay or 20.0 mA value. –20% to +120% FS User defined value.
Deadband Sets the amount of deadband in percent

of full scale for relays.

Tank Cylindrical
Capacity

Tank Ends
Capacity

Tank Type Identifies type of tank. 0 = Linear/Vertical

The capacity, in Engineering Units, of
only the cylindrical portion of the tank.

The capacity, in Engineering Units, of
only the dished ends of a hori zont al
cylindrical tank (includes both ends).
Or, total capacity for spherical tanks.

0 (disabled), 0.1,

0.2, 0.5, 1, 2, 5, 10%

0 to 9,999 (Keypad)
0 to 19,999 (Serial)

0 to 9,999 (Keypad)
0 to 19,999 (Serial)

1 = Non Linear

SetPoint model
only.

P9 = 0 for spherical
tanks.

P10 = 0 for linear
tanks, or cylindrical
tanks with flat ends.

6

9R143 Dated 3/2011

ENGINEERING UNITS

The following Engineering Units are available on the M2110L Smart Level Gauge:

1. Gallons

2. Pounds

3. Cubic Feet

4. Liters

5. Percent

6. Kilograms

7. Cubic Meters

8. InH2O – Inches of Water Column (density reference temperature: 20°C)

9. User Units – User Defined Units

STEP BY STEP: CHANGING ENGINEERING UNITS

Step Action Display

1
2

3

4

Notes

Gauge should be in the normal Measure Mode. Normal Level Display.
Press the ENG UNITS (Up↑) key.

If the lockout is active, the gauge will now prompt for entry of
the lockout code. Refer to “STEP BY STEP: ENTERING A
LOCKOUT CODE (When Prompted)” on page 21.

Press the Up↑ or Down↓ keys repeatedly to scroll
to the desired Engineering Unit.

The Zero function (Up↑ and Down↓) will reset the scroll to the
first unit and allow selection to continue.

Press the PRGM/Enter→ key when the desired
unit is flashing.

1. When scrolling through Engineering Units, User Units are denoted by all units flashing.

2. In Measure Mode, User Units are denoted by no Engineering Unit indicators shown on the bottom

of the display.

3. Changing the Engineering Unit will automatically update the SetPoint and Capacity registers as

appropriate (refer to the Automatic Update section on pages 16, 18, and 19 for further explanation).

4. If programmed in a volumetric unit (gallons, liters, feet

to other volumetric units using the ENG UNITS (Up↑) key, and likewise for mass units (pounds,
kilograms). However, the Smart Level Gauge will not convert between volumetric units, mass
units, and/or user units. Percent (%) and InH
programmed.

Current Engineering Unit1 indicator flashes.

The current Engineering Unit indicator remains
solid since it is active, and the unit to be selected
flashes as the list is scrolled.

The display switches to the new Engineering Unit
and returns to Measure Mode.

3

, meter3), the Smart Level Gauge will convert

O are available regardless of what unit was

2

2

5. At any time, the Backspace← key will abort the process and return to Measure Mode.

6. If there is no keypad activity for approximately 1 minute, the operation is aborted and the gauge

returns to Measure Mode unchanged.

7

9R143 Dated 3/2011

ZERO REFERENCE

Zeroing the gauge consists of accepting the current applied pressure value as the zero pressure reference. To set the
zero reference pressure, all pressure sources should be disconnected from the gauge, and its temperature should be
stable.

The Smart Level Gauge displays tank level as a function of the applied pressure. This pressure is linearly offset
from the zero reference value, before applying the tank level calculations.

AFFECT ON OUTPUTS

The SetPoint and Current Loop outputs are calculated based on the displayed level. Since re-zeroing the

gauge may change the displayed level, the outputs may change accordingly. For safety purposes, if the
outputs are active (defined by register P5; see page 15), an extra step is required to warn the operator and
confirm the desired action. For clarity, both scenarios are described below, step-by-step.

FACTORY ZERO

The “Factory Zero” can be restored through the serial port service only (SetPoint and Current Loop mode ls

only). This is the value set during calibration of the sensor, and is typically 0.0.

RANGE CHECK

The Smart Gauge can be zeroed only when the applied pressure is within ±5% of sensor full scale. If the

applied pressure is greater than 5% of full scale, an error code will be displayed when zeroing is attempted.

STEP BY STEP: RE-ZEROING THE GAUGE (Disabled Outputs, P5=0)

Step Action Display

1

2

Gauge should be in normal Measure Mode, with
applied pressure ready for zeroing (typically vented).

Press the Up↑ and Down↓ keys simultaneously.

If the lockout is active, the gauge will now prompt for entry of the
lockout code. Refer to “STEP BY STEP: ENTERING A
LOCKOUT CODE (When Prompted)” on page 21.

Normal level display, near 0.0 (or offset from the
Residual Hydrostatic Pressure, P3).

The display will flash “0000” several times while
the new zero is taken, and then return to Measure

Mode with the new zero activated.

WHEN OUTPUTS ARE ACTIVE (P5>0) ...

1

2

3

Gauge should be in normal Measure Mode, with
applied pressure ready for zeroing (typically vented).

Press the Up↑ and Down↓ keys simultaneously.

If the lockout is active, the gauge will now prompt for entry of the
lockout code. Refer to “STEP BY STEP: ENTERING A
LOCKOUT CODE (When Prompted)” on page 21.

Press PRGM/Enter→ before the countdown

1

expires

. This acknowledges the warning.

Normal level display, near 0.0 (or offset from the
Residual Hydrostatic Pressure, P3).

The display will begin countdown from
“0005” to “0000”.

The display will again countdown from
“0005” to “0000”.

SetPoint and Current
Loop models only

4

Notes

Press ZERO again (Up↑ and Down↓) before the
countdown expires

1. During steps 2 or 3, if the countdown expires, the gauge will return to Measure Mode un chan ged.

2. During steps 2 or 3, the Backspace← key will abort the process and return to Measure Mode.

3. The zero reference value is snapshot immediately when the ZERO keys are pressed. This temporarily

stored value is accepted once the zeroing process is complete (or discarded if not completed).

1

. This confirms the zero action.

The display will flash “0000” several times while
the new zero is taken.

8