Dwyer APM APM Manual

Bulletin: L-APM

Series APM Analog Panel Meter

Instruction Manual

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, IN 46360, U.S.A.

Fax: [phone]

e-mail: [e-mail]

• 1/8 DIN Digital Panel Flow Rate/Totalizers with NEMA 4X, IP65 Front

• 0-20 mA, 4-20 mA, 0-5 V, 1-5 V, and ±10 V Inputs

• Dual-Line 6-Digit Display, 0.6" (15 mm) & 0.46" (12 mm)

• Isolated 24 VDC @ 200 mA Transmitter Power Supply

• 2 or 4 Relays with Interlocking Capability + Isolated 4-20 mA Output Options

• Free PC-Based, On-Board, Panel Meter Pro USB Programming Software

• No Assembly Required

• Display Rate & Total at the Same Time

• Rate in Units per Second, Minute, Hour, or Day

• Total, Grand Total or Non-Resettable Grand Total

• Front Panel or Remote Total Reset

• Password Protection for Total Reset

• Total Stored in Non-Volatile Memory

• Assign Any Relay for Rate or Total

• 4-20 mA Output for Rate or Total

• Sampling Relay

• Display Open Channel Flow with Programmable Exponent Feature

• 32-Point Linearization & Square Root Extraction

• Optional SunBright Display Models for Outdoor Applications

• Operating Temperature Range: -40 to 65°C (-40 to 149°F)

• UL & C-UL Listed. E160849; 508 Industrial Control Equipment

• Input Power Options: 85-265 VAC / 90-265 VDC or 12-24 VDC / 12-24 VAC

• Programmable Display, Function Keys & Digital Input

• External 4-Relay & Digital I/O Modules

• RS-232 & RS-485 Serial Communication Options with Modbus RTU

• Wide Assortment of NEMA 4X Enclosures for up to Ten Meters

• 3-Year Warranty

Phone: [phone] dwyer-inst.com

Series APM Analog Panel Meter Instruction Manual

Disclaimer

The information contained in this document is
subject to change without notice. Dwyer
Instruments, Inc. makes no representations or
warranties with respect to the contents hereof
and specifically disclaims any implied warranties
of merchantability or fitness for a particular
purpose. See Warranty Information and Terms &
Conditions on www.dwyer-inst.com
details.

• Read complete instructions prior to installation
and operation of the meter.

for complete

FREE Panel Meter Pro
Programming Software

• Risk of electric shock or personal injury.

• This product is not recommended for life support

applications or applications where malfunctioning
could result in personal injury or property loss.
Anyone using this product for such applications
does so at his/her own risk. Dwyer Instruments,
Inc. shall not be held liable for damages resulting
from such improper use.

WARNING

Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Limited Warranty

Dwyer Instruments, Inc. warrants this product
against defects in material or workmanship for
the specified period under “Specifications” from
the date of shipment from the factory. Dwyer
Instruments’ liability under this limited warranty
shall not exceed the purchase value, repair, or
replacement of the defective unit. See Warranty
Information and Terms & Conditions on

www.dwyer-inst.com

Registered Trademarks

All trademarks mentioned in this document are
the property of their respective owners.

© 2020 Dwyer Instruments, Inc.
All rights reserved.

for complete details.

The meter can be powered from the Micro USB connection.
When using the Micro USB connection, DO NOT apply AC or DC
power to the meter.

The easiest and quickest way to program your MPM
meter is to use the FREE Panel Meter Pro
programming software. This software is loaded into
the meter and connects and installs directly to your
PC with a USB cable. We recommend that the first
thing you do after taking the meter out of the box is
connect the MPM to your PC with the provided USB
cable – do not use a different cable. DO NOT apply
AC or DC power to the meter while your PC is
connected to the meter as it will disrupt the USB
connection. You don’t even have to apply an input
signal.

Panel Meter Pro programming software is intuitive,
and most customers can get their meter programmed
as they like without even looking in the manual.

In addition to programming, the software may be used
for:

• Monitoring

• Datalogging using your PC

• Generating and saving programming files for

later use

Once your meter is programmed the way you want it,
you can wire it up for your application per the
instructions in this manual and install it. If you find that
you need to make adjustments to the programming
after the meter is installed, you can use the front panel
buttons and the instructions in this manual to do so.

2

Series APM Analog Panel Meter Instruction Manual

Table of Contents

Introduction ......................................................................................................... 6

Using the APM Like an MPM Process Meter ................................................ 6

Ordering Information .......................................................................................... 6

Specifications ..................................................................................................... 7

General ............................................................................................................ 7

Process Input ................................................................................................. 8

Rate/Totalizer .................................................................................................. 8

Relays .............................................................................................................. 9

Isolated 4-20 mA Transmitter Output ........................................................... 9

USB Connection ........................................................................................... 10

On-Board Digital Input (F4) ......................................................................... 10

Modbus® RTU Serial Communications ....................................................... 10

Panel Meter Pro ............................................................................................ 10

Compliance Information................................................................................... 11

Safety ............................................................................................................ 11

Electromagnetic Compatibility .................................................................... 11

Safety Information ............................................................................................ 11

Installation......................................................................................................... 11

Unpacking ..................................................................................................... 11

Panel Mounting Instructions ....................................................................... 12

Mounting Dimensions ................................................................................ 12

Installation Overview ................................................................................... 13

Panel Meter Pro Software ............................................................................ 13

Panel Meter Pro Installation ....................................................................... 13

Transmitter Supply Voltage Selection (P+, P-) .......................................... 14

Connections ................................................................................................. 14

Connectors Labeling .................................................................................. 14

Power Connections .................................................................................... 15

Signal Connections .................................................................................... 15

Modbus RTU Serial Communications ........................................................ 15

Relay Connections ..................................................................................... 15

Switching Inductive Loads.......................................................................... 16

F4 Digital Input Connections ...................................................................... 16

4-20 mA Output Connections ..................................................................... 16

Analog Output Power Supply ..................................................................... 16

External Relay & Digital I/O Connections ................................................... 17

Interlock Relay Feature .............................................................................. 17

Setup and Programming .................................................................................. 18

Front Panel Buttons and Status LED Indicators........................................ 18

Display Functions & Messages ................................................................... 19

Main Menu ..................................................................................................... 21

Setting Numeric Values ............................................................................... 21

Setting Up the Rate/Totalizer Meter (setup) ............................................... 21

Setting the Input Signal (Input) ................................................................. 22

Setting the Totalizer Features (total) ....................................................... 22

Setting the Display Units or Custom Tags (units) .................................... 22

Setting the Decimal Point (dEc.pt) ............................................................. 23

Programming the Rate/Totalizer (prog) ..................................................... 23

Setting the Display Parameter & Intensity (dsplay) .................................. 25

Display Intensity (d-Inty).......................................................................... 25

Setting the Relay Operation (relay) .......................................................... 26

Relay Assignment (Assign) ....................................................................... 26

Setting the Relay Action ............................................................................. 26

Programming Set and Reset Points ........................................................... 27

Setting Fail-Safe Operation ........................................................................ 27

Programming Time Delay .......................................................................... 27

Relay Action for Loss of 4-20 mA Input (Loop Break) ................................ 27

3

Series APM Analog Panel Meter Instruction Manual

Relay and Alarm Operation Diagrams ........................................................ 28

High Alarm Operation (Set > Reset) .............................................................. 28

Low Alarm Operation (Set < Reset) ........................................................... 28

High Alarm with Fail-Safe Operation (Set > Reset) .................................... 28

Low Alarm with Fail-Safe Operation (Set < Reset)..................................... 28

Time Delay Operation ................................................................................ 29

Rate Relay Sampling Operation ................................................................. 29

Total Relay Sampling Operation ................................................................ 29

Relay Operation Details ............................................................................... 30

Overview .................................................................................................... 30

Relays Auto Initialization ............................................................................ 30

Fail-Safe Operation .................................................................................... 30

Front Panel LEDs ....................................................................................... 30

Latching and Non-Latching Relay Operation ............................................. 30

Non-Latching Relay (Auto) ........................................................................ 31

Non-Latching Relay with Manual Reset (A-nman) ...................................... 31

Latching Relay with Clear (LatcH) ............................................................. 31

Latching Relay (Lt-Clr) ............................................................................ 31

Acknowledging Relays ............................................................................... 32

Setting Up the Interlock Relay (Force On) Feature .................................... 32

Scaling the 4-20 mA Analog Output (Aout) ................................................ 33

Reset Menu (reset) ...................................................................................... 33

Manual Control Menu (Contrl) ................................................................... 33

Setting Up the Password (pass) .................................................................. 34

Protecting or Locking the Meter ................................................................. 34

Total Reset Password & Non-Resettable Total .......................................... 34

Making Changes to a Password Protected Meter ...................................... 34

Disabling Password Protection .................................................................. 34

Advanced Features Menu ............................................................................ 35

Advanced Features Menu & Display Messages ......................................... 35

Noise Filter (filter) ................................................................................. 36

Noise Filter Bypass (bypass) ..................................................................... 36

Rounding Feature (round) ......................................................................... 36

Modbus RTU Serial Communications (serial) ......................................... 36

Select Menu (SElEct) ................................................................................ 37

Input Signal Conditioning (Functn) ............................................................ 37

Low-Flow Cutoff (CutofF) .......................................................................... 38

Totalizer Count Up/Down (Count) .............................................................. 38

Analog Output Programming (AoutPr) ...................................................... 38

Programmable Function Keys User Menu (user) ...................................... 39

Internal Source Calibration (ICAL) ............................................................. 40

Meter Operation ................................................................................................ 41

Front Panel Buttons Operation ................................................................... 41

Function Keys Operation ............................................................................. 41

F4 Operation ................................................................................................. 41

Maximum/Minimum Readings ..................................................................... 41

Totalizer Overflow Displays Total to 9 Digits ............................................. 41

Troubleshooting ............................................................................................... 42

Diagnostics Menu (diag) ............................................................................. 42

Determining Software Version ................................................................... 42

Reset Meter to Factory Defaults.................................................................. 42

Factory Defaults & User Settings ............................................................... 43

Troubleshooting Tips ................................................................................... 44

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Series APM Analog Panel Meter Instruction Manual

Table of Figures

Figure 1: 1/8 DIN Panel Cutout and Mounting ................................................ 12

Figure 2. Meter Dimensions - Side View ......................................................... 12

Figure 3. Meter Dimensions - Top View .......................................................... 12

Figure 4: Transmitter Supply Voltage Selection ............................................ 14

Figure 5. APM-100 & APM-200 Connectors Label .......................................... 14

Figure 6. APM-120 & APM-220 Connectors Label .......................................... 14

Figure 7. APM-101 & APM-201 Connectors Label .......................................... 14

Figure 8. APM-140 & APM-240 Connectors Label .......................................... 14

Figure 9. APM-121 & APM-221 Connectors Label .......................................... 14

Figure 10. APM-141 & APM-241 Connectors Label ........................................ 14

Figure 11: Power Connections ........................................................................ 15

Figure 12: Transmitter Powered by Internal Supply ...................................... 15

Figure 13: Transmitter Powered by External Supply or Self-Powered ........ 15

Figure 14: Voltage Input Connections ............................................................ 15

Figure 15: Relay Connections ......................................................................... 15

Figure 16: AC and DC Loads Protection ........................................................ 16

Figure 17: Low Voltage DC Loads Protection ................................................ 16

Figure 18: F4 Digital Input Connections ......................................................... 16

Figure 19: 4-20 mA Output Connections ........................................................ 16

Figure 20. Analog Output Supply Powering Other Devices .......................... 16

Figure 21. Expansion Module & DIN Rail Mounting Kit ................................. 17

Figure 22. External Relays Module Connections ........................................... 17

Figure 23. Digital I/O Module Connections ..................................................... 17

Figure 24. Interlock Connection ...................................................................... 17

5

Series APM Analog Panel Meter Instruction Manual

85-265 VAC
Model

12-24 VDC
Model

APM-100

APM-200

No options

APM-101

APM-201

4-20 mA output

APM-120

APM-220

2 relays

APM-121

APM-221

2 relays & 4-20 mA output

APM-140

APM-240

4 relays

APM-141

APM-241

4 relays & 4-20 mA output

Model

Description

PMA-01

RS-232 serial adapter

PMA-02

USB serial adapter

PMA-03

RS-422/485 serial adapter

PMA-04

RS-232 to RS-422/485 isolated converter

PMA-05

RS-232 to RS-422/485 non-isolated
converter

PMA-06

USB to RS-232 non-isolated converter

PMA-07

USB to RS-422/485 isolated converter

PMA-08

USB to RS-422/485 non-isolated
converter

PMA-09

Suppressor (snubber): 0.01 μF/470 Ω,
250 VAC

DIN rail mounting kit for two expansion
modules

PMA-11

4 SPST (Form A) relays

4 digital inputs & 4 digital outputs
(2 may be connected)

Series

Meters

Material

PME-10

1-10

Plastic NEMA 4X

PME-20

1-6

Plastic NEMA 4X

PME-30

1-6

Stainless Steel NEMA 4X

PME-40

1-6

Painted Steel NEMA 4

PME-00

1-2

Plastic NEMA 4X

Introduction

Front, back and in between, the APM meter boasts
specifications, features and functionality that make it
the only 1/8 DIN analog input flow rate/totalizer you
will ever need. The number one feature that makes
the APM such a useful device is its built-in 24 VDC @
200 mA power supply to drive the transmitter. This
feature not only saves the cost of an external power
supply, but also greatly simplifies wiring. In addition,
there is a second 24 VDC @ 40 mA power supply
provided with the 4-20 mA output option.

The second most important feature about these
meters is they can display flow rate and total at the
same time. In fact, the 6-digit dual line display can be
programmed for a wide variety of flow applications,
including: flow rate and tag, total and tag, total and
grand total, and even non-resettable grand total.

Another reason why the APM Meter is the only flow
rate/totalizer you will ever need is its NEMA 4X rated
front panel. This means you can install the APM in
panels exposed to moisture, dust and other adverse
conditions.

Other key features include four relays and 4-20 mA
output option, remote total reset, advanced input
signal conditioning like square root extraction and
programmable exponent for open channel flow.

Finally, all these features and capabilities can easily
be programmed with free Panel Meter Pro software.

Ordering Information

Standard Models

Options Installed

Accessories

PMA-10

PMA-12

Using the APM Like an MPM Process Meter

The APM is essentially a MPM process meter with
flow totalization capability. The flow totalization
capability can easily be de-activated for customers
that would prefer their APM behave like a MPM
process meter. For instructions on how to do this, see

Setting Up the Rate/Totalizer Meter (setup) on page
21 for details.

Enclosures

6

Series APM Analog Panel Meter Instruction Manual

99999 to 999999), with lead

Update Rate

Overrange

units

is

instruction manual at www.dwyer-inst.com).

Methods

Three programmable passwords restrict

manually

share one 5 A fuse

Rejection

Operating temperature range:

relays, digital I/O, and serial communication
color: black

Front Panel

Torque

Weight

Specifications

Except where noted all specifications apply to
operation at +25°C.

General

Display

Display
Intensity

Display

Line 1: 0.6" (15 mm) high, red LEDs
Line 2: 0.46" (12 mm) high, red LEDs
6 digits: each (­zero blanking.

Eight user selectable intensity levels.
Default value is six.

5/second (200 ms)

Isolation

Overvoltage
Category

Environmental

Connections

4 kV input/output-to-power line
500 V input-to-output or output-to-P+ supply

Installation Overvoltage Category II:
Local level with smaller transient
overvoltages than Installation Overvoltage
Category III.

-40 to 65°C (-40 to 149°F)

Storage temperature range:

-40 to 85°C (-40 to 185°F)

Relative humidity:

0 to 90% non-condensing

Removable screw terminal blocks accept
12 to 22 AWG wire, RJ45 for external

Display flashes 999999

Underrange Display flashes -99999

Display
Assignment

Programming

Noise Filter

Filter Bypass

Recalibration

Max/Min
Display

Rounding Select 1, 2, 5, 10, 20, 50, or 100

Password

Display lines 1 & 2 may be assigned to
rate, total, grand total, alternate (rate/total,
rate/grand total, rate/units, total/units, and
grand total/units), set points, max/min,
(line 2 only), and Modbus input. Additional
displays are available if parameter total
off, and parameter d-SCAL is on: gross,
alternating gross/net, PV1, PV2, and PCT
(refer to the APM Analog Panel Meter

Four front panel buttons, digital inputs, or
PC with Panel Meter Pro software.

Programmable from 2 to 199
(0 will disable filter)

Programmable from 0.1 to 99.9% of
calibrated span

All ranges are calibrated at the factory.
Recalibration is recommended at least
every 12 months.

Max/min readings reached by the process
are stored until reset by the user or until
power to the meter is turned off.

(e.g. rounding = 10, value = 123.45,
display = 123.50).

modification of programmed settings and
two prevent resetting the totals.
Pass 1: Allows use of function keys and
digital inputs
Pass 2: Allows use of function keys, digital
inputs and editing set/reset points
Pass 3: Restricts all programming, function
keys, and digital inputs.
Total: Prevents resetting the total manually
Gtotal: Prevents resetting the grand total

Enclosure

Mounting

Tightening

Overall
Dimensions

Warranty

adapters.

1/8 DIN, high impact plastic, UL 94V-0,

NEMA 4X, IP65

1/8 DIN panel cutout required:

3.622" x 1.772" (92 mm x 45 mm)
Two panel mounting bracket assemblies
are provided.

Screw terminal connectors: 5 lb-in
(0.56 Nm)

4.68" x 2.45" x 5.64"
(119 mm x 62 mm x 143 mm)
(W x H x D)

9.5 oz (269 g)

3 years parts & labor. See Warranty
Information and Terms & Conditions on

www.dwyer-inst.com

for complete details.

Non-Volatile
Memory

Power
Options

Fuse

Normal Mode

All programmed settings are stored in
non-volatile memory for a minimum of ten
years if power is lost.

85-265 VAC 50/60 Hz; 90-265 VDC, 20 W max;
12-24 VDC, 12-24 VAC, 15 W max.
Powered over USB for configuration only.

Required external fuse: UL Recognized,
5 A max, slow blow; up to 6 meters may

Greater than 60 dB at 50/60 Hz

7

Series APM Analog Panel Meter Instruction Manual

Inputs

Field selectable: 0-20 mA, 4-20 mA

Modbus PV (Slave)

Isolated

Accuracy

±0.03% of calibrated span ±1 count,

span

Temperature

span/°C max from -40 to 0°C ambient

Input Signal

Linear, square root, programmable

calculation

Multi-Point
Linearization

2 to 32 points

Programmable
Exponent

User selectable from 1.0001 to 2.9999 for
open channel flow

Round

Tank

Diameter & Length: 999.999 inch or cm

respectively.

Low-Flow

0.0 to 999,999.9 (0 disables cutoff

always shows zero.

Decimal Point

Up to five decimal places or none:

, or

Calibration

Input Range

Minimum Span
Input 1 & Input 2

4-20 mA

0.15 mA

10 V

0.10 V

An error message will appear if the input 1
and input 2 signals are too close together.

Input

Voltage ranges: greater than 500 kΩ

resettable fuse impedance)

Input

Current input protected by resettable fuse,

after fault is removed.

HART

The meter does not interfere with existing

display secondary HART variables.

Rate Display

Total Display

0 to 999,999; automatic lead zero blanking.

overflow and ▲ LED is illuminated.

Total

Up to five decimal places or none:

decimal point.

Totalizer

Calculates total based on rate and field

which the rate is displayed.

Totalizer
Rollover

999,999,999. Relay status reflects display.

Total

Override

Totalizer

indication.

Programmable

0.1 and 999.9 seconds; applied to the first

total is reset.

Total Reset

User selectable via front panel button, F4

delay, or through serial communications.

Total Reset

Total and grand total passwords may be

grand total from the front panel.

Non-Resettable

The grand total can be programmed as a

password “050873”.

disabled.

Process Input

±10 V (0-5 V, 1-5 V, 0-10 V)

Transmitter
Power Supply

Drift

Conditioning

Terminals P+ & P-: 24 VDC ±10%.
All models selectable for 24, 10, or 5 VDC

supply (internal jumper J4). 85-265 VAC
models rated @ 200 mA max, 12-24 VDC
powered models rated @ 100 mA max.
5 & 10 VDC supply rated @ 50 mA max.
Refer to Figure 4: Transmitter Supply Voltage

Selection on page 14 and
Figure 19: 4-20 mA Output Connections on

page 16.

square root & programmable exponent
accuracy range: 10-100% of calibrated

0.005% of calibrated span/°C max from
0 to 65°C ambient, 0.01% of calibrated

exponent, or round horizontal tank volume

& Total
Overflow

Decimal Point

Overflow

Presets

“T” LED is illuminated while displaying total
or grand total.
Up to 999,999,999 with total-overflow
feature. “oF” is displayed to the left of total

d.ddddd, d.dddd, d.ddd, d.dd, d.d, or dddddd
Total decimal point is independent of rate

programmable multiplier to display total in
engineering units. Time base must be
selected according to the time units in

Totalizer rolls over when display exceeds

Program total reset for automatic with

0.1 second delay and set point 1 for
999,999

Up to eight, user selectable under setup
menu. Any set point can be assigned to
total and may be programmed anywhere in
the range of the meter for total alarm

Horizontal

Cutoff

Range

Impedance

Overload

Transparency

calculates volume in gallons or liters

function). Point below at which display

d.ddddd, d.dddd, d.ddd, d.dd, d.d

±

Current ranges: 50 - 100 Ω (depending on

30 VDC max. Fuse resets automatically

HART communications; it displays the
4-20 mA primary variable and it allows the
HART communications to pass through
without interruption. The meter is not
affected if a HART communicator is
connected to the loop. The meter does not

dddddd

Delay
On Release

Password

Total

relay assigned to total or grand total.
If the meter is programmed to reset total to

zero automatically when the preset is
reached, then a delay will occur before the

terminal at back of meter, external contact
closure on digital inputs, automatically via
user selectable preset value and time

entered to prevent resetting the total or

non-resettable total by entering the

• Once the Grand Total has been programmed as

“non-resettable” the feature CANNOT be

Rate/Totalizer

Indication

-99999 to 999999, lead zero blanking.
“R” LED illuminates while displaying rate.

8

Series APM Analog Panel Meter Instruction Manual

Deadband

• Automatic (non-latching) and/or

• Manual on/off control mode

Programmable and independent for

will go to alarm state.

can split the optional

Relays

Rating

Noise
Suppression

Relay
Assignment

High or Low
Alarm

Relay
Operation

Relay Reset

Time Delay

Fail-Safe
Operation

2 or 4 SPDT (Form C) internal and/or
4 SPST (Form A) external; rated 3 A
@ 30 VDC and 125/250 VAC resistive load;
1/14 HP (≈ 50 W) @ 125/250 VAC for
inductive loads

Noise suppression is recommended for
each relay contact switching inductive
loads. See Switching Inductive Loads on
page 16 for details.

Relays may be assigned to rate, total, or
grand total.

0-100% of span, user programmable

User may program any alarm for high or
low trip point. Unused alarm LEDs and
relays may be disabled (turn off).

manual reset

• Latching (requires manual
acknowledge) with or without clear

• Pump alternation control (2-8 relays)

• Sampling (based on set point and time)

• Off (disable unused relays and enable

Interlock feature)

User selectable via front panel button, F4
terminal at back of meter, external contact
closure on digital inputs, automatically via
user selectable preset value and time
delay, or through serial communications.

0 to 999.9 seconds, on & off relay time
delays.
each relay.

Programmable and independent for each
relay.

Note: Relay coil is energized in non-alarm
condition. In case of power failure, relay

Isolated 4-20 mA Transmitter Output

Output Source

Scaling Range 1.000 to 23.000 mA for any display range.

Calibration

Analog Out
Programming

Accuracy ± 0.1% FS ± 0.004 mA

Temperature
Drift

Isolated
Transmitter
Power Supply

External Loop
Power Supply

Output Loop
Resistance

Additional
4-20 mA
Outputs

0-10 VDC
Output

Rate/process, total, grand total, max, min,
set points 1-8, or manual control mode

Factory calibrated:

4.000 to 20.000 = 4-20 mA output

23.000 mA maximum for all parameters:
Overrange, underrange, max, min, and
break

0.4 µA/°C max from 0 to 65°C ambient,

0.8 µA/°C max from -40 to 0°C ambient

Note: Analog output drift is separate from
input drift.

Terminals I+ & R: 24 VDC ±10%. May be
used to power the 4-20 mA output or other
devices.

All models rated @ 40 mA max.

35 VDC maximum

Power supply Minimum Maximum

24 VDC

35 VDC
(external)

The PD659-1MA-2MA
4-20 mA output into two isolated 4-20 mA
outputs

The PD659-1MA-1V can convert the
optional 4-20 mA output to a 0-10 VDC
output

10 Ω 700 Ω

100 Ω 1200 Ω

Auto
Initialization

Additional
Relays

When power is applied to the meter, relays
will reflect the state of the input to the
meter.

An external module, model PMA-11, is
available to add 4 SPST 3 A relays to the
meter.

9

Series APM Analog Panel Meter Instruction Manual

Cable

for

a complete list of capabilities.

Data

Parity

System
Requirements

Microsoft® Windows® XP/Vista/7/8/10

Communications

USB 2.0 (for programming only)

logging)

Configuration

Configure meters one at a time

Power

USB port provides power to the meter.

meter while the USB port is in use.

USB Connection

Function Programming only

Compatibility USB 2.0 Standard, Compliant

Connector
Type

Driver Microsoft® Windows® XP/Vista/7/8/10

Power

Micro-B receptacle

USB A Male to Micro-B Cable

USB port provides power to the meter.

DO NOT apply AC or DC power to the
meter while the USB port is in use.

On-Board Digital Input (F4)

Function

Contacts

Logic Levels

Additional I/O

Reset total, remote operation of front-panel
buttons, acknowledge/reset relays, reset
max/min values. See Function Keys &
Digital I/O Available Settings on page 39

3.3 VDC on contact. Connect normally
open contacts across F4 to COM

Logic High: 3 to 5 VDC
Logic Low: 0 to 1.25 VDC

Up to 2 external modules, model PMA-12
with 4 digital inputs and 4 digital outputs
each can be added.

Modbus® RTU Serial Communications

Slave Id 1 – 247 (Meter address)

Baud Rate 300 - 19,200 bps

Transmit
Time Delay

Byte-To-Byte
Timeout

Turn Around
Delay

Note: Refer to the APM Modbus Register Tables located at

www.dwyer-inst.com

Programmable between 0 and 199 ms

8 bit (1 start bit, 1 or 2 stop bits)

Even, Odd, or None with 1 or 2 stop bits

0.01 – 2.54 second

Less than 2 ms (fixed)

for details.

Panel Meter Pro

(Standard USB A to Micro USB B)
RS-232 adapter, RS-485 adapter and

RS-485 to USB converter
(programming, monitoring, and data

DO NOT apply AC or DC power to the

10

Series APM Analog Panel Meter Instruction Manual

UL & c-UL
Listed

USA & Canada
UL 508 Industrial Control Equipment

UL File Number

E212517

Front Panel

UL Type 4X, NEMA 4X, IP65; panel
gasket provided

Low Voltage

EN 61010-1:2010

control, and laboratory use

Emissions

EN 55022:2010
Class A ITE emissions requirements

Radiated
Emissions

Class A

AC Mains

Emissions

Class A

Immunity

EN 61326-1:2013

standard

RFI -

Modulated

80 -1000 MHz 10 V/m 80% AM (1 kHz)

2.0 - 2.7 GHz 1 V/m 80% AM (1 kHz)

Electrical

Transients

±2kV AC mains, ±1kV other

Electrostatic
Discharge

±4kV contact, ±8kV air

RFI ­Conducted

10V, 0.15-80 MHz, 1kHz 80% AM

AC Surge

±2kV Common, ±1kV Differential

Surge

1KV (CM)

Power-

Field

30 A/m 70%V for 0.5 period

70%V for 25 periods

Voltage
Interruptions

<5%V for 250 periods

Compliance Information

Safety Information

Safety

Directive

Safety requirements for measurement,

Electromagnetic Compatibility

Conducted

Measurement, control, and laboratory
equipment
EN 61000-6-2:2005
EMC heavy industrial generic immunity

Amplitude

Fast

1.4 - 2.0 GHz 3 V/m 80% AM (1 kHz)

• Read complete instructions prior to installation
and operation of the meter.

• Risk of electric shock or personal injury.

• Hazardous voltages exist within enclosure.

Installation and service should be performed only
by trained service personnel.

Installation

There is no need to remove the meter from its
case to complete the installation, wiring, and
setup of the meter for most applications.
Instructions are provided for changing the
transmitter power supply to output 5 or 10 VDC
instead of 24 VDC. See Figure 4: Transmitter
Supply Voltage Selection on page 14.

Unpacking

Remove the meter from box. Inspect the
packaging and contents for damage. Report
damages, if any, to the carrier.

If any part is missing or the meter malfunctions,
please contact your supplier or the factory for
assistance.

Frequency
Magnetic

Voltage Dips 40%V for 5 & 50 periods

Note:

Testing was conducted on meters installed through the
covers of grounded metal enclosures with cable shields
grounded at the point of entry representing installations
designed to optimize EMC performance.

11

Series APM Analog Panel Meter Instruction Manual

G

aske

t

Panel

Moun

ting

Bracket

Mounting

Screw

Mi

cro U

SB

Connec

ti

on

Rem

ov

ab

l

e

Connec

tor

s

0.39"

(10 mm)

4.18"

(106 mm)

1.72"

(44 mm)

4.77"

(121 mm)

5.07"

(129 mm)

2.41"

(61 mm)

4.41"

(112 mm)

4.18"

(106 mm)

3.61"

(91.5 mm)

Optional

Connectors

Installed

3.622" (92 mm)

1.772"

(45mm)

Panel Cutout

to DIN 43700

Square Corners to 0.060"

(1.5mm) Max Radius

A

B

Tolerances:

A: +0.032 (+0.8mm)

-0.000 (-0.0mm)

B: +0.024 (+0.6mm)

-0.000 (-0.0mm)

Panel Mounting Instructions

• Prepare a standard 1/8 DIN panel cutout –

3.622" x 1.772" (92 mm x 45 mm). Refer to
Figure 1: 1/8 DIN Panel Cutout and Mounting
below for more details.

• Clearance: allow at least 6.0" (152 mm) behind
the panel for wiring.

• Panel thickness: 0.04" - 0.25" (1.0 mm - 6.4 mm).
Recommended minimum panel thickness to
maintain Type 4X rating: 0.06" (1.5 mm) steel
panel, 0.16" (4.1 mm) plastic panel.

• Remove the two mounting brackets provided with
the meter (back-off the two screws so that there is
¼" (6.4 mm) or less through the bracket. Slide the
bracket toward the front of the case and remove).

• Insert meter into the panel cutout.

• Install mounting brackets and tighten the screws

against the panel. To achieve a proper seal,
tighten the mounting bracket screws evenly until
meter is snug to the panel along its short side.
DO NOT OVER TIGHTEN, as the rear of the
panel may be damaged.

Mounting Dimensions

Figure 2. Meter Dimensions - Side View

Figure 3. Meter Dimensions - Top View

DO NOT apply AC or DC power to the meter when using the
Micro USB connection.

Figure 1: 1/8 DIN Panel Cutout and Mounting

12

Series APM Analog Panel Meter Instruction Manual

Installation Overview

We recommend the following sequence for getting the
meter into service:

1. DO NOT apply AC or DC power to the meter.

2. Connect the meter to the PC with the USB cable
provided. DO NOT use a different USB cable.

3. If Panel Meter Pro is already installed in your
computer, then the program will launch
automatically in most systems. If the program
does not start automatically, double-click on the
MVPro icon.

4. If MVPro is not installed, follow the instructions
provided below.

5. Use MVPro to configure the meter for your
application.

6. Disconnect the USB cable from the meter.

7. Apply power and signal and check operation of
the meter.

8. Install the meter and put into service.

9. Make any programming adjustments using the
front panel buttons.

2. Once the driver is installed, an AutoPlay
dialog should appear for the drive
“MAINSTAL.” Click “Open folder to view
files.”

If the computer does not display an AutoPlay
dialog for the drive “MAINSTAL,” you should
open My Computer and double-click on the
drive labeled “MAINSTAL.”

3. Double-click on the file named “MAStart.”
The program will open a few windows and
install two programs on your computer.
Simply follow the on-screen instructions until
you see one of the dialogs below. If you
receive a “User Account Control” warning,
click “Yes.”

Panel Meter Pro Software

The easiest and quickest way to program your APM
meter is to use the FREE Panel Meter Pro
programming software. This software is loaded into
the meter and connects and installs directly to your
PC with the USB cable provided. DO NOT use a
different USB cable. We recommend that the first
thing you do after taking the meter out of the box is
connect the APM to your PC with the provided USB
cable. DO NOT apply AC or DC power to the meter
while your PC is connected to the meter as it will
disrupt the USB connection. It is not necessary to
apply an input signal.

Panel Meter Pro programming software is intuitive,
and most customers can get their meter programmed
as they like without even looking in the manual.

4. If there is an update available, click the
“Update” button to install the new version.
Otherwise, click “Configure” to begin
programming your meter.

Panel Meter Pro Installation

1. Connect one end of the provided USB cable

to the meter and the other end to the
computer. The computer will automatically
install the driver software it needs to talk to
the meter. Follow the on-screen instructions
and allow sufficient time for the process to
complete. This can take a few minutes. If the
process is interrupted, then it could leave the
system in an unstable condition.

• Only one meter may be connected at a time.
Attaching multiple meters will cause a conflict
with the meter software.

• DO NOT apply AC or DC power to the meter
when using the Micro USB connection.

Note: If you decide to update your Panel Meter Pro
software, once the installation has completed, you
will be asked if you want to update the setup files
located on the meter itself. This way, you will
always have the most current version on the meter
for future installs.

• DO NOT unplug the meter while the new

installation files are being written to it. The meter
will display uwrite during the process and you
will receive an on-screen notification once the
process is complete.

13

Series APM Analog Panel Meter Instruction Manual

Transmitter Supply Voltage Selection (P+, P-)

All meters, including models equipped with the
12-24 VDC power option, are shipped from the
factory configured to provide 24 VDC power for
the transmitter or sensor.

If the transmitter requires 5 or 10 VDC excitation,
the internal jumper J4 must be configured
accordingly.

To access the voltage selection jumper:

1. Remove all the connectors.

2. Unscrew the back cover.

3. Slide the back cover about 1 inch.

4. Configure the J4 jumper, located behind the

input signal connector, for the desired
excitation voltage as shown.

Figure 6. APM-120 & APM-220 Connectors Label

Figure 7. APM-101 & APM-201 Connectors Label

Figure 4: Transmitter Supply Voltage Selection

Connections

All connections are made to removable screw
terminal connectors located at the rear of the
meter.

• Use copper wire with 60°C or 60/75°C insulation
for all line voltage connections. Observe all safety
regulations. Electrical wiring should be performed
in accordance with all applicable national, state,
and local codes to prevent damage to the meter
and ensure personnel safety.

Connectors Labeling

The connectors’ label, affixed to the meter, shows the
location of all connectors available with requested
configuration.

Figure 8. APM-140 & APM-240 Connectors Label

Figure 9. APM-121 & APM-221 Connectors Label

Figure 10. APM-141 & APM-241 Connectors Label

Figure 5. APM-100 & APM-200 Connectors Label

• DO NOT connect any equipment other than

Dwyer’s expansion modules, cables, or meters to
the RJ45 M LINK connector. Otherwise damage
will occur to the equipment and the meter.

14

Series APM Analog Panel Meter Instruction Manual

AC or DC

POWER

Required External Fuse:

5 A max, 250 V Slow Blow

POWER

+

-

C NONO NC NC C

RELAY4 RELAY3

4 36 5 2 1

C NONO NC NC C

RELAY2 RELAY1

4 36 5 2 1

Power Connections

Power connections are made to a two-terminal
connector labeled POWER. The meter will operate
regardless of DC polarity connection. The + and ­symbols are only a suggested wiring convention.

The current input is protected against current
overload by a resettable fuse. The display may or
may not show a fault condition depending on the
nature of the overload.

The fuse limits the current to a safe level when it
detects a fault condition, and automatically resets
itself when the fault condition is removed.

Figure 11: Power Connections

Signal Connections

Signal connections are made to a six-terminal
connector labeled SIGNAL. The COM (common)
terminal is the return for the 4-20 mA and the ±10 V
input signals.

Current and Voltage Connections

The following figures show examples of current and
voltage connections.

There are no switches or jumpers to set up for current
and voltage inputs. Setup and programming is
performed through the front panel buttons.

Figure 12: Transmitter Powered by Internal Supply

Figure 14: Voltage Input Connections

The meter is capable of accepting any voltage from ­10 VDC to +10 VDC.

Modbus RTU Serial Communications

Serial communications connection is made to an
RJ45 connector labeled M-LINK. For interfacing to the
MPM, use the PMA-01 for RS-232 or the PMA-03 for
RS-485. The same port is used for interfacing with all
expansion modules (e.g. external relays, digital I/O).

Relay Connections

Relay connections are made to two six-terminal
connectors labeled RELAY1 – RELAY4. Each relay’s
C terminal is common only to the normally open (NO)
and normally closed (NC) contacts of the
corresponding relay. The relays’ C terminals should
not be confused with the COM (common) terminal of
the INPUT SIGNAL connector.

Figure 13: Transmitter Powered by External

Supply or Self-Powered

Figure 15: Relay Connections

15

Series APM Analog Panel Meter Instruction Manual

C

R

C

R

Switching Inductive Loads

The use of snubbers to suppress electrical noise is
strongly recommended when switching inductive
loads to prevent disrupting the microprocessor’s
operation. The snubbers also prolong the life of the
relay contacts. Suppression can be obtained with
resistor-capacitor (RC) networks assembled by the
user or purchased as complete assemblies. Refer to
the following circuits for RC network assembly and
installation:

F4 Digital Input Connections

A digital input, F4, is standard on the meter. This
digital input should be connected with a normally
open contact across F4 and COM, or with an active
low signal applied to F4. It can be used to reset the
total, for remote operation of front-panel buttons, to
acknowledge/reset relays, or to reset max/min values.
See Function Keys & Digital I/O Available Settings on
page 39 for a complete list of capabilities.

Figure 16: AC and DC Loads Protection

Choose R and C as follows:
R: 0.5 to 1 Ω for each volt across the contacts
C: 0.5 to 1 µF for each amp through closed contacts
Notes:

1. Use capacitors rated for 250 VAC.

2. RC networks may affect load release time of
solenoid loads. Check to confirm proper
operation.

3. Install the RC network at the meter's relay screw
terminals. An RC network may also be installed
across the load. Experiment for best results.

Use a diode with a reverse breakdown voltage two to three
times the circuit voltage and forward current at least as large
as the load current.

Figure 18: F4 Digital Input Connections

4-20 mA Output Connections

Connections for the 4-20 mA transmitter output are
made to the connector terminals labeled mA OUT.
The 4-20 mA output may be powered internally or
from an external power supply.

Figure 19: 4-20 mA Output Connections

Analog Output Power Supply

The internal 24 VDC power supply powering the
analog output may be used to power other devices, if
the analog output is not used. The I+ terminal is the
+24 V and the R terminal is the return.

Figure 17: Low Voltage DC Loads Protection

RC Networks (Snubbers) Available from Dwyer Instruments, Inc.

RC networks are available from Dwyer Instruments,
Inc. and should be applied to each relay contact
switching an inductive load. Part number: PMA-13.

Note: Relays are de-rated to 1/14th HP (50 watts)
with an inductive load.

.

Figure 20. Analog Output Supply Powering Other

Devices

16

Series APM Analog Panel Meter Instruction Manual

1 2

RLY5 RLY6 RLY7 RLY8

3 4 5 6 7 8

NO C NO C NO C NO C

1 2 3 4 5 6

+5 I1 I2 I3 I4 O1

7 8

O2 O3

9 10

O4 G

DI 1-4 DO 1-4

5 VDC GND

External Relay & Digital I/O Connections

The relay and the digital I/O expansion modules
PMA-11 & PMA-12 are connected to the meter using
a CAT5 cable provided with each module. The two
RJ45 connectors on the expansion modules are
identical and interchangeable; they are used to
connect additional modules to the system.

Note: The jumper located between the RJ45

connectors of the PMA-12 must be removed on
the second digital I/O module in order for the
system to recognize it as module #2.

• DO NOT connect or disconnect the expansion
modules with the power on! More detailed
instructions are provided with each optional
expansion module.

Interlock Relay Feature

As the name implies, the interlock relay feature
reassigns one, or more, alarm/control relays for use
as interlock relay(s). Interlock contact(s) are wired to
digital input(s) and activate the interlock relay. This
feature is enabled by configuring the relay, and the
corresponding digital input(s), see Setting Up the
Interlock Relay (Force On) Feature on page 32.

In the example below, an Interlock Contact switch is
connected to a digital input, which will be used to
force on (energize) the Interlock Relay. The Interlock
Relay and the Control Relay are connected in series
with the load.

• When the Interlock Contact is closed (safe), the
Interlock Relay energizes, allowing power to flow
to the Control Relay; the corresponding front
panel LED is on.

• When the Interlock Contact is open, the
corresponding front panel LED flashes (locked
out), the Interlock Relay is de-energized,
preventing power from flowing to the Control
Relay and the load.

.

Figure 21. Expansion Module &

DIN Rail Mounting Kit

Figure 22. External Relays Module Connections

Figure 23. Digital I/O Module Connections

Figure 24. Interlock Connection

17

Series APM Analog Panel Meter Instruction Manual

There is no need to recalibrate the meter

Button

Description

LED

Status

Flashing:

Total

Note:

Grand Total

Total

Note:

Setup and Programming

Front Panel Buttons and Status LED Indicators

when first received from the factory.
The meter is factory calibrated prior to

shipment for milliamps and volts with
calibration equipment that is certified to NIST
standards.

Overview

There are no jumpers to set for the meter input
selection.

Setup and programming is done using Panel Meter
Pro or through the front panel buttons.

After power and input signal connections have been
completed and verified, apply power to the meter.

Menu 1-8

Alarm 1 – 8
indicators

Right
arrow/F1

Up arrow/F2 R

Enter/F3 T

F4 is a digital input. Alarms
5-8 are enabled when relay
expansion module is
installed.

LEDs for relays in manual mode flash with the “M” LED
every 10 seconds. “M” flashing by itself indicates Aout –
manual control is used.

G T

▲

1-8

M

Relay in
manual
control mode

Rate
indicator

indicator or
Flashing:
Tare

indicator

overflow
indicator

• Press the Menu button to enter or exit the
Programming Mode at any time.

• Press the Right arrow button to move to the next
digit during digit
or decimal point programming.

• Press or hold the Up arrow button to scroll
through the menus, decimal point, or to
increment the value of a digit.

• Press the Enter button to access a menu or to
accept a setting.

• Press and hold the Menu button for three
seconds to access the advanced features of the
meter.

18

Series APM Analog Panel Meter Instruction Manual

Display Functions & Messages

Description

(relays assigned to rate)

Display Functions & Messages

The meter displays various functions and messages
during setup, programming, and operation. The
following table shows the main menu functions and
messages in the order they appear in the menu.

Display Functions & Messages

Display Parameter

setup

Input

nmA

volt

Total

d-SCAL

units

rate

total

Gtotal

Dec pt

prog

InCAL

sCalE

Cal

Inp 1

Dis 1

Inp 2

Dis 2

Error

T tb

T CF

T rst

GT tb

Setup Enter Setup menu

Input

4-20 mA

0-10 VDC

Total

Dual-scale

Units

Rate

Total

Grand Total

Decimal
point

Program Enter the Program menu

Input
Calibration

Scale Enter the Scale menu

Calibrate Enter the Calibrate menu

Input 1

Display 1 Program display 1 value

Input 2

Display 2

Error

Total time
base

Total
conversion
factor

Total reset

Grand total
time base

Action/Setting
Description

Enter Input selection
menu

Set meter for 4-20 mA
input

Set meter for ±10 VDC
input

Enable or disable
totalizer features

Enter d-SCAL menu and
select Yes for dual- scale
or No for single scale
display

Select the display
units/tags

Select the display units
for rate

Select the display units
for total

Select the display units
for grand total

Set decimal point for rate,
total, grand total

Enter the Input
Calibration menu

Calibrate input 1 signal or
program input 1 value

Calibrate input 2 signal or
program input 2 value
(up to 32 points)

Program display 2 value
(up to 32 points)

Error, calibration not
successful, check signal
or programmed value

Program total time base

Program total conversion
factor

Program total rest mode:
auto or manual

Program grand total time
base

Display Parameter

GT CF

GT rst

Auto

T dly

nmAn

dsplay

Line 1

Line 2

d-Inty

RELaY

Assign

Asign1

totAL

G total

nm bus

rate

RLY 1

Act 1

Auto

A-nman

LatCH

Lt-CLr

Altern

Sanmpl

Grand total
conversion
factor

Grand total
reset

Automatic Press Enter to set

Time delay Program time delay for

Manual Press Enter to reset total

Display Enter the Display menu

Line 1 Press Enter to assign the

Line 2

Display
intensity

Relay Enter the Relay menu

Assignment Assign relays to rate,

Assign 1 Relay 1 assignment

Total Assign relay to total

Grand total Assign relay to grand

Modbus Select to display Modbus

Rate Assign relay to rate

Relay 1 Relay 1 setup

Action 1 Set relay 1 action

Automatic Set relay for automatic

Auto-manual

Latching

Latching­cleared

Alternate

Sampling

Action/Setting

Program grand total
conversion factor

Program grand total rest
mode: auto or manual

automatic total reset

total auto reset

manually

Main display parameter
(default: PV or rate)

Press Enter to assign the
small display parameter
(default: total)

Set display intensity level
from 1 to 8

total, or grand total

total

input or to assign
Modbus input as the
analog output source

reset

Set relay for automatic &
manual reset
any time

Set relay for latching
operation (relays
assigned to rate)

Set relay for latching
operation with manual
reset only after alarm
condition has cleared

Set relay for pump
alternation control (relays
assigned to rate)

Set relay for sampling
operation

19

Series APM Analog Panel Meter Instruction Manual

Display Functions & Messages

Description

Interlock feature)

Display Functions & Messages

Description

Display Parameter

OFF

Set 1

RSt 1

RLY 2

FaiLSF

FLS 1

on

off

DeLAY

DLY 1

On 1

OFF 1

break

iGnorE

On

OFF

Aout

Dis 1

Out 1

Dis 2

Out 2

reset

Rst Gt

Rst Hi

Rst Lo

Rst HL

Rst t

Off

Set 1 Program set point 1

Reset 1 Program reset point 1

Relay 2

Fail-safe Enter Fail-safe menu

Fail-safe 1

On Enable fail-safe operation

Fail-safe off

Delay

Delay 1

On Set relay 1 On time delay

Off Set relay 1 Off time delay

Loop break Set relay condition if loop

Ignore Ignore loop break

On

Off

Analog
output

Display 1 Program display 1 value

Output 1 Program output 1 value

Display 2 Program display 2 value

Output 2

Reset Press Enter to access the

Reset
grand total

Reset high Press Enter to reset max

Reset low

Reset
high & low

Reset total Press Enter to reset total

Action/Setting

Disable relay and front
panel status LED
(Select Off to enable

Relays 2-8 setup

Note: Relays 5-8 are
shown, only if expansion
relay module is installed.

Set relay 1 fail-safe
operation

Disable fail-safe
operation

Enter relay Time Delay
menu

Enter relay 1 time delay
setup

break detected
(For mA input only)

condition
(Processed as a low
signal condition)

Relay goes to alarm
condition when loop
break is detected

Relay goes to non-alarm
condition when loop
break is detected

Enter the Analog output
scaling menu

(e.g. 4.000 mA)

Program output 2 value
(e.g. 20.000 mA)

Reset menu

Press Enter to reset
grand total

display

Press Enter to reset min
display

Press Enter to reset max
& min displays

Display Parameter

Rst tr

Contrl

Auto

nmAn

pass

Pass 1

Pass 2

Pass 3

Total

Gtotal

nonrst

unloc

locd

999999

-99999

Reset tare Reset tare (Used when

Control Enter Control menu

Automatic Press Enter to set relays

Manual

Password Enter the Password

Password 1 Set or enter Password 1

Password 2 Set or enter Password 2

Password 3 Set or enter Password 3

Total
password

Grand total
password

Non­resettable

Unlocked Program password to

Locked Enter password to unlock

Flashing
display

Action/Setting

Total is no only)

and analog output for
automatic operation

Press Enter to manually
control relays or analog
output operation

menu

Set or enter password for
manual reset

Set or enter password for
manual reset

Non-resettable grand
total set after entering
“050873” for Gtotal
password

lock meter

meter

Overrange condition
Underrange condition

20

Series APM Analog Panel Meter Instruction Manual

Main Menu

The main menu consists of the most commonly used
functions: Reset, Control, Setup, and Password.

• Press Menu button to enter Programming Mode,
then press the Up arrow button to scroll main
menu.

• Press Menu, at any time, to exit and return to
Run Mode. Changes made to settings prior to
pressing Enter are not saved.

• Changes to the settings are saved to memory
only after pressing Enter/F3.

• The display moves to the next menu every time a
setting is accepted by pressing Enter/F3.

Setting Numeric Values

The numeric values are set using the Right and Up
arrow buttons. Press Right arrow to select next digit
and Up arrow to increment digit value. The digit being
changed is displayed brighter than the rest. Press and
hold Up to auto-increment the display value. If
negative numbers are allowed, the first digit position
will include a negative symbol (-) after the 9.

Press the Enter button, at any time, to accept a
setting or Menu button to exit without saving changes.

Setting Up the Rate/Totalizer
Meter (

The Setup menu is used to select:

Press the Enter button to access any menu or press
Up arrow button to scroll through choices. Press the
Menu button to exit at any time.

setup)

1. Input signal the meter will accept and enable
totalizer features

2. Select the display units/tags

3. Select the decimal point position

4. Meter programming & input calibration

5. Display parameter and intensity

6. Relay operation

7. 4-20 mA analog output scaling

21

Series APM Analog Panel Meter Instruction Manual

Display

Character

Display

Character

0

1

2

3

4

O

5

o

6

7

8

9

c

w

d

X

-

]

[

J

Space

Setting the Input Signal (Input)

Enter the Input menu to set up the meter to display
current (nmA) or voltage (Volt) inputs.

The current input is capable of accepting any signal
from 0 to 20 mA. Select current input to accept
0-20 mA or 4-20 mA signals.

The voltage input is capable of accepting any signal
from -10 to +10 VDC. Select voltage input to accept
0-5, 1-5, 0-10, or ±10 VDC signals.

Setting the Totalizer Features (total)

To simply not display the total, select alternative
display parameters in the display (dsplay) menu.

Enable or disable the totalizer features by selecting
“Yes” or “no” after the input type has been set up. If
the totalizer features are disabled, all the totalizer
features and functions are hidden from the menus.
Level and process meter features and functions are
added to the menus.

If disabling the total parameter by selecting no,
please refer to the MPM Panel Meter manual
available at www.dwyer-inst.com
setting up the meter parameters.

Notes:

1. The totalizer continues working in the background.

2. When selecting "no" for Total, the meter now
functions as a MPM Process Meter. We strongly
suggest that you download and use the MPM
instruction manual from our website www.dwyer-

inst.com while in this mode of operation.

for instructions on

Setting the Display Units or Custom Tags (units)

Use this menu to enter the unit or custom tag that will
be displayed if:

1. Alternating rate, total, or grand total and
units is selected in the units menu, or

2. d unit is selected as the line 2 parameter.

See the Setting the Display Parameter & Intensity
(dsplay) flow chart on page 24 to access the display
menu to show the unit or tag on line 2. The
engineering units or custom legends can be set using
the following 7-segment character set:

0
1
2
3
4
5
6
7
8
9
A
b
C

A

b

C

c
d
e
f
g
9
H
h
I
I

E

F

G

g

H

h

I

i

j

Notes:

Degree symbol represented by (<) if programming with
Panel Meter Pro.

The letters “m” and “w” use two 7-segment LEDs each;
when selected the characters to the right are shifted one
position.

Press and hold up arrow to auto-scroll the characters in
the display.

k
l

n m

n
O

o
p

q
r

s
t

u
v

uw

x
y

z

-
/
[

]
=

!

K

L

m

n

P

q

r

S

t

u

V

Y

Z

/

=

Degree(<)

22

Series APM Analog Panel Meter Instruction Manual

Setting the Decimal Point (dEc.pt)

The decimal point may be set with up to five decimal
places or with no decimal point at all. The rate, total,
and grand total decimal points are independent.

The decimal point selection should be made prior to
scaling, calibrating or programming the meter.
Pressing the Right arrow moves the decimal point one
place to the right until no decimal point is displayed
then it moves to the leftmost position. Pressing the Up
arrow moves the decimal point one place to the left.

Programming the Rate/Totalizer (prog)

The meter may either be scaled (SCALE) without
applying an input or calibrated (Cal) by applying an
input. The meter comes factory calibrated to NIST
standards, so for initial setup, it is recommended to
use the (SCALE) function.

The Program menu contains the following menus:

1. Scale without a signal source

2. Calibrate with a calibrated signal source

3. Total time base & conversion factor

4. Grand total time base & conversion factor

5. Total reset mode for total & grand total

Process inputs may be scaled or calibrated to any
display within the range of the meter.

Note: The Scale and Calibrate functions are
exclusive of each other. The meter uses the last
function programmed. Only one of these methods
can be employed at a time. The Scale and Calibrate
functions can use up to 32 points (default is 2). The
number of points should be set in the Advanced
menu prior to scaling and calibration of the meter.
See Multi-Point Linearization (Linear) menu on page
37 for details.

The process input may be calibrated or scaled to any
display value within the range of the meter.

Multi-Point Calibration & Scaling

The meter is set up at the factory for 2-point linear
calibration. The number of points for multi-point
calibration/scaling is set up in the Advanced Features
menu. Up to 32 linearization points may be selected.
See Multi-Point Linearization (Linear) menu on page
37 for details.

Input Calibration Method (InCAL)

There are two methods of calibrating (or scaling) the
display to show the correct engineering units.

• Use the Scale menu to enter the scaling without a
signal source.

• Use the Calibrate menu to apply a signal from a
signal source.

Note: The Scale and Calibrate functions are exclusive
of each other. The meter uses the last function
programmed. Only one of these methods can be
employed at a time. The Scale and Calibrate
functions can use up to 32 points (default is 2). The
number of points should be set in the Advanced menu
prior to scaling and calibration of the meter. See
Multi-Point Linearization (Linear) on page 37 for
details.

Scaling the Meter (SCALE)

The process inputs (4-20 mA and ±10 VDC) can be
scaled to display the process variable in engineering
units.

A signal source is not needed to scale the meter;
simply program the inputs and corresponding display
values.

Additional parameters, not needed for most applications,
are programmed in the Advanced Features menu; see
Advanced Features Menu on page 35.

23

Series APM Analog Panel Meter Instruction Manual

Input range

Input 1 & input 2 span

4-20 mA

0.15 mA

±10 VDC

0.10 VDC

Error Message (Error)

An error message indicates that the calibration or
scaling process was not successful.
After the error message is displayed, the meter
reverts to the input prior to the failure during
calibration or scaling and to input 1 during internal
calibration, allowing the appropriate input signal to be
applied or programmed.
The error message might be caused by any of the
following conditions:

1. Input signal is not connected to the proper
terminals or it is connected backwards*.

2. Wrong signal selection in Setup menu*.

3. Minimum input span requirements not
maintained.

4. Input 1 signal inadvertently applied to calibrate
input 2*.

*Not relevant when scaling the meter.

For instructions on how to program numeric values
see Setting Numeric Values on page 21.

Minimum Input Span

The minimum input span is the minimum difference
between input 1 and input 2 signals required to
complete the calibration or scaling of the meter.

Calibrating the Meter with External
Source (

The meter can be calibrated to display the process
variable in engineering units by applying the
appropriate input signal and following the calibration
procedure.

The use of a calibrated signal source is strongly
recommended to calibrate the meter.

Cal)

Time Base, Total Conversion Factor & Total Reset

The time base, total conversion factor, and total reset
menus are located in the Program menu.

The total and grand total have their own independent
settings. This means that one can be displaying the
value in gallons while the other displays in million
gallons, liters, m

3

, etc.

Time Base

The time base is the amount of time over which the
rate parameter should accrue. For example, if the rate
was ten and the time base was in minutes, then the
total would increase by ten every one minute.

Total & Grand Total Conversion Factor

The total & grand total conversion factor is the
amount by which the rate is multiplied before it is
added to the total or grand total. For Example, if the
rate was ten per second and the total conversion
factor was 100, the total would increase by 1000
every second. This is useful, for instance, if you want
to show rate in gallons and total in thousands of
gallons.

Total & Grand Total Reset

The totals can be programmed for automatic or
manual reset. In the automatic reset mode, a
programmable time delay is available to reset the total
or grand total after the assigned preset is reached.
The totals can also be reset via the front panel button,
via a switch across the on-board F4 terminal, the
PMA-12 digital I/O expansion module, or via a
Modbus command.

Warm up the meter for at least 15 minutes before

performing calibration to ensure specified

accuracy.

Non-Resettable Totalizer

The total and grand total can be password-protected
to prevent unauthorized resets. The grand total can
be programmed as a non-resettable total. See Total
Reset Password & Non-Resettable Total on page 34
for details.

24

Series APM Analog Panel Meter Instruction Manual

Setting the Display Parameter & Intensity (dsplay)

Display line 1 can be programmed to display:

1. Rate value

2. Total or grand total

3. Toggle rate/total

4. Toggle rate/G-total

5. Relay set points

6. Toggle rate and units

7. Toggle total and units

8. Toggle grand total and units

9. Max, min, or max & min values

10. Modbus input

Display line 2 can be programmed to display:

1. Engineering units or custom legends

for line 1

2. Rate value

3. Total or grand total

4. Toggle rate/total

5. Toggle rate/G-total

6. Relay set points

7. Toggle rate and units

8. Toggle total and units

9. Toggle grand total and units

10. Max, min, or max & min values

11. Modbus input

12. Off (no display)

Selecting engineering units or custom legends as
display line 2 (d unit) will display the unit or tag
selected for the rate, total, or grand total displayed on
line 1.

For example, if line 1 is set to total, selecting
d unit to display on line 2 will have the total appear
on line 1, and the total unit appear on line 2.

After setting up the input and the display, press the
Menu button to exit programming and skip the rest of
the setup menu. Press the Menu button again and the
Up arrow to reach the Program menu and complete
the scaling or calibration of the meter.

Display Flow Rate, Total or Grand Total

Line 1 can be programmed to display flow rate, total,
or grand total, and line 2 can be programmed to
display flow rate, total, grand total, engineering units,
custom legends, or be turned off. Both lines can also
display relay set points, or max and min values.

Display Toggling Between Reading & Units

The APM meter can be programmed so that line 1
and line 2 toggle between the reading and their
engineering units. For instance, line 1 displays flow
rate, line 2 displays total, and the display toggles to
show their units.

Display Intensity (d-Inty)

The meter has eight display intensity levels to give the
best performance under various lighting conditions.
Select intensity 8 for outdoor applications. The default
intensity setting is 6.

25

Series APM Analog Panel Meter Instruction Manual

Setting the Relay Operation (relay)

This menu is used to set up the operation of the
relays.

• During setup, the relays do not follow the input
and they will remain in the state found prior to
entering the Relay menu.

1. Relay assignment

a. Rate for low and high alarm
b. Total
c. Grand total
d. Modbus input process variable

2. Relay action

a. Automatic reset only (non-latching)
b. Automatic + manual reset at any time

(non-latching)
c. Latching (manual reset only)
d. Latching with Clear (manual reset only

after alarm condition has cleared)
e. Pump alternation control (automatic

reset only)
f. Sampling (the relay is activated for a

user-specified time)
g. Off (relay state controlled by Interlock

feature)

3. Set and reset points

4. Fail-safe operation
a. On (enabled)
b. Off (disabled)

5. Time delay
a. On delay (0-999.9 seconds)
b. Off delay (0-999.9 seconds)

6. Relay action for loss (break) of 4-20 mA input

(ignore, on, off)

Relay Assignment (Assign)

The relays can be assigned to any of the following
parameters:

1. Rate for low or high alarm indication

2. Total for alarm indication

3. Grand total for alarm indication

4. Modbus input process variable

Setting the Relay Action

Operation of the relays is programmed in the Action
menu. The relays may be set up for any of the
following modes of operation:

1. Automatic reset (non-latching)

2. Automatic + manual reset at any time
(non-latching)

3. Latching (manual reset only, at any time)

4. Latching with Clear (manual reset only after
alarm condition has cleared)

5. Pump alternation control (automatic reset only)

6. Sampling (the relay is activated for a user­specified time)

7. Off (relay state controlled by Interlock feature)

The following graphic shows relay 1 action setup;
relay 2-8 are set up in a similar fashion.

26

Series APM Analog Panel Meter Instruction Manual

Programming Set and Reset Points

High alarm indication: program set point above reset
point.

Low alarm indication: program set point below reset
point.

The deadband is determined by the difference
between set and reset points. Minimum deadband is
one display count. If the set and reset points are
programmed with the same value, the relay will reset
one count below the set point.

Note: Changes are not saved until the reset point has
been accepted.

Relay Action for Loss of 4-20 mA Input (Loop Break)

A loop break condition is triggered when the 4-20 mA
input signal drops below 0.005 mA. Each relay may
be programmed to go to one of the following
conditions when the meter detects the loss of the
input signal (i.e. < 0.005 mA):

1. Turn On (Go to alarm condition)

2. Turn Off (Go to non-alarm condition)

3. Ignore (Process as a low signal condition)

The following graph shows the loop break relay
operation for a high alarm relay.

Setting Fail-Safe Operation

In fail-safe mode of operation, the relay coil is
energized when the process variable is within safe
limits and the relay coil is de-energized when the alarm
condition exists. The fail-safe operation is set
independently for each relay. Select on to enable or
select off to disable fail-safe operation.

Programming Time Delay

The On and Off time delays may be programmed for
each relay between 0 and 999.9 seconds. The relays
will transfer only after the condition has been
maintained for the corresponding time delay.

The On time delay is associated with the set point.
The Off time delay is associated with the reset point.

27

Series APM Analog Panel Meter Instruction Manual

Relay and Alarm Operation Diagrams

The following graphs illustrate the operation of the
relays, status LEDs, and ACK button.

High Alarm Operation (Set > Reset)

High Alarm with Fail-Safe Operation (Set > Reset)

For Manual reset mode, ACK can be pressed anytime to turn "off" relay. To
detect a new alarm condition, the signal must go below the set point, and then go
above it.

Low Alarm Operation (Set < Reset)

Note: Relay coil is energized in non-alarm condition. In case of power failure,
relay will go to alarm state.

Low Alarm with Fail-Safe Operation (Set < Reset)

For Manual reset mode, ACK can be pressed anytime to turn "off" relay. To
detect a new alarm condition, the signal must go below the set point, and then go
above it.

Note: Relay coil is energized in non-alarm condition. In case of power failure,
relay will go to alarm state.

28

Series APM Analog Panel Meter Instruction Manual

Preset = 100

100

Relay

LED

Total

200

300

Sample

Time

Sample

Time

Sample

Time

Time Delay Operation

The following graphs show the operation of the time
delay function.

When the signal crosses the set point, the On time delay
timer starts and the relay trips when the time delay has
elapsed. If the signal drops below the set point (high
alarm) before the time delay has elapsed, the On time
delay timer resets and the relay does not change state.
The same principle applies to the Off time delay.

Note: If “Automatic or Manual (A-nmAn)” reset mode is

selected, the LED follows the reset point and
not the relay state when the relay is
acknowledged.

Rate Relay Sampling Operation

When the signal crosses the set point, the relay trips
and the sample time starts. After the sample time has
elapsed, the relay resets. The cycle repeats every
time the set point is crossed, going up for high alarms
and going down for low alarms.

The sample time can be programmed between 0.1
and 5999.9 seconds

.

Total Relay Sampling Operation

When the total reaches the preset, the relay trips and
the sample time starts. After the sample time has
elapsed, the relay resets. The cycle repeats every
time the preset value is added to the total.

29

Series APM Analog Panel Meter Instruction Manual

Fail-Safe

Non-Alarm State

Alarm State

Power
NO

NC

NO

NC

Off

Open

Closed

Closed

Open

Relays
On

Closed

Open

Open

Closed

Relays

LED

Status

LED

Status

1

Alarm 1

5

Alarm 5

2

Alarm 2

6

Alarm 6

3

Alarm 3

7

Alarm 7

4

Alarm 4

8

Alarm 8

Power-

1

HI

1000

500

499

Off 2 LO

700

900

499

On 3 LO

250

400

499

Off 4 HI

450

200

499

On

Relay terminology for following tables

Terminology

Relay Condition

On

Alarm (Tripped)

Off

Normal (Reset)

Ack

Acknowledged

Relay Operation Details

Overview

The relay capabilities of the meter expand its
usefulness beyond simple indication to provide users
with alarm and control functions. These capabilities
include front panel alarm status LEDs as well as
either 2 or 4 optional internal relays and/or 4 external
relays expansion module. Typical applications include
high or low temperature, level, pressure or flow
alarms, control applications such as simple on/off
pump control, pump alternation control for up to 8
pumps, and basic batch control. There are four basic
ways the relays can be used:

1. High or Low Alarms with Latching or Non­Latching Relays

2. Simple On/Off Control with 100% Adjustable
Deadband

3. Sampling (Based on Time)

4. Pump Alternation Control for up to 8 Pumps

Relays Auto Initialization

When power is applied to the meter, the front panel
LEDs and alarm relays will reflect the state of the
input to the meter. The following table indicates how
the alarm LEDs and relays will react on power-up
based on the set and reset points:

Alarm #

HI or LO

Alarm

Fail-Safe Operation

The following table indicates how the relays behave
based on the fail-safe selection for each relay:

Selection

Set

Point

Reset

Point

Up

Reading

Relay &

LED

Failure

Front Panel LEDs

The LEDs on the front panel provide status indication
for the following:

The meter is supplied with four alarm points that
include front panel LEDs to indicate alarm conditions.
This standard feature is particularly useful for alarm
applications that require visual-only indication. The
LEDs are controlled by the set and reset points
programmed by the user. When the display reaches a
set point for a high or low alarm, the corresponding
alarm LED will turn on. When the display returns to
the reset point the LED will go off. The front panel
LEDs respond differently for latching and non-latching
relays.

For non-latching relays, the LED is always off during
normal condition and always on during alarm
condition, regardless of the state of the relay (e.g.
Relay acknowledged after alarm condition).

For latching relays, the alarm LEDs reflect the status
of the relays, regardless of the alarm condition. The
following tables illustrate how the alarm LEDs function
in relation to the relays and the acknowledge button
(Default: F3 key assigned to ACK).

Latching and Non-Latching Relay Operation

The relays can be set up for latching (manual reset)
or non-latching (automatic reset) operation.

Note: NO = Normally Open, NC = Normally Closed.
This refers to the condition of the relay contacts when
the power to the meter is off.

go to
non­alarm
state

go to
alarm
state

The On and Off terminology does not refer to the
status of the relay’s coil, which depends on the fail­safe mode selected.

• In latching relay mode, if Fail-Safe is off, latched
relays will reset (unlatch) when power is cycled.

30

Series APM Analog Panel Meter Instruction Manual

Automatic reset only

Condition

LED

Relay

Normal

Off

Off

Alarm

On

On

Ack (No effect)

On

On

Normal

Off

Off

Automatic + manual reset at any time

Condition

LED

Relay

Normal

Off

Off

Alarm

On

On

Normal

Off

Off

Next Alarm

On

On

Ack

On

Off

Normal

Off

Off

Manual reset any time

Condition

LED

Relay

Normal

Off

Off

Alarm

On

On

Ack

Off

Off

Manual reset only after alarm condition has

cleared

Condition

LED

Relay

Normal

Off

Off

Alarm

On

On

Ack (No effect)

On

On

Normal

On

On

Ack

Off

Off

Non-Latching Relay (Auto)

In this application, the meter is set up for automatic
reset (non-latching relay). Acknowledging the alarm
while it is still present has no effect on either the LED
or the relay. When the alarm finally goes away, the
relay automatically resets and the LED also goes off.

Non-Latching Relay with Manual Reset (A-nman)

In this application, the meter is set up for automatic
and manual reset at any time (non-latching relay).
The LED and the relay automatically reset when the
meter returns to the normal condition.

In addition, the relay can be manually reset while the
alarm condition still exists, but the LED will stay on
until the meter returns to the normal condition.

Latching Relay with Clear (LatcH)

In this application, the meter is set up for manual
reset at any time. Acknowledging the alarm even if
the alarm condition is still present resets the relay and
turns off the LED.

Latching Relay (Lt-Clr)

In this application, the meter is set up for manual reset
only after the signal passes the reset point (alarm
condition has cleared). Acknowledging the alarm while it
is still present has no effect on either the LED or the
relay. When the alarm is acknowledged after it returns to
the normal state, the LED and the relay go off. Notice
that the LED remains on, even after the meter returns to
the normal condition. This is because, for latching relays,
the alarm LED reflects the status of the relay, regardless
of the alarm condition.

31

Series APM Analog Panel Meter Instruction Manual

1 2 3 4 5 6

+5 I1 I2 I3 I4 O1

7 8

O2 O3

9 10

O4 G

DI 1-4 DO 1-4

5 VDC

GND

SW2

SW1

Acknowledging Relays

There are three ways to acknowledge relays
programmed for manual reset:

1. Via the programmable front panel function keys
F1-F3 (Example: F3 assigned to ACK).

Setting Up the Interlock Relay (Force On) Feature

Relays 1-4 can be set up as interlock relays. To set
up the relays for the interlock feature:

1. Access the Setup – Relay – Action menu and set
the action to off.

2. Remotely via a normally open pushbutton wired
to the F4 terminal at the rear of the instrument.

3. One of the digital inputs and the +5 V terminals
on the digital I/O expansion module.

When the ACK button or the assigned digital input is
closed, all relays programmed for manual reset are
acknowledged.

2. In the Advanced features – User menu program
any of the digital inputs to Force On any of the
internal relays (1-4).

3. Connect a switch or dry contact between the +5V
terminal and the corresponding digital input (dI-1
to dI-4) terminal.

Interlock Relay Operation Example

Relays 1 & 2 are configured to energize (their front
panel LEDs are steady on) when SW1 & SW2
switches (above) are closed. If the contacts to these
digital inputs are opened, the corresponding front
panel LEDs flash indicating this condition. The
processes being controlled by the interlock relay will
stop, and will re-start only after the interlock relay is
re-activated by the digital inputs (switches).

Note: If multiple digital inputs are assigned to the
same relay, then the corresponding logic is (AND) –
i.e. both switches must be closed to activate the relay.

32

Series APM Analog Panel Meter Instruction Manual

Scaling the 4-20 mA Analog
Output (

The 4-20 mA analog output can be scaled to provide
a 4-20 mA signal for any display range selected.

No equipment is needed to scale the analog output;
simply program the display values to the
corresponding mA output signal.

The Analog Output menu is used to program the 4-20
mA output based on display values.

For further details, see Setting Numeric Values,
page 21, Relay Action for Loss of 4-20 mA Input
(Loop Break), page 27.

Aout)

Reset Menu (reset)

The Reset menu is used to reset the totals and maximum
or minimum reading (peak or valley) reached by the
process; both may be reset at the same time by selecting
“reset high & low” (rst HL). If total is set to no, the tare
value used to zero the display may be reset by selecting
“reset tare” (rst tr).

Manual Control Menu (Contrl)

The Manual Control menu is used to control the
4-20 mA analog output and the relays manually,
ignoring the input. Each relay and analog output can
be programmed independently for manual control.
Selecting automatic control sets all relays and analog
output for automatic operation.

33

Series APM Analog Panel Meter Instruction Manual

Setting Up the Password (pass)

The Password menu is used for programming three
levels of security to prevent unauthorized changes to
the programmed parameter settings and to program
the non-resettable totalizer.

Pass 1: Allows use of function keys and digital
inputs
Pass 2: Allows use of function keys, digital inputs
and editing set/reset points
Pass 3: Restricts all programming, function keys,
and digital inputs.

Total: Prevents resetting the total manually
Gtotal: Prevents resetting the grand total manually

Protecting or Locking the Meter

Enter the Password menu and program a six-digit
password.

For instructions on how to program numeric values
see Setting Numeric Values on page 21.

Making Changes to a Password Protected Meter

If the meter is password protected, the meter will
display the message Locd (Locked) when the Menu
button is pressed. Press the Enter button while the
message is being displayed and enter the correct
password to gain access the menu. After exiting the
programming mode, the meter returns to its password
protected condition.

Disabling Password Protection

To disable the password protection, access the
Password menu and enter the correct password
twice, as shown below. The meter is now unprotected
until a new password is entered.

Total Reset Password & Non­Resettable Total

The total and the grand total can be password­protected to prevent unauthorized total resets.

The grand total can be programmed as a non­resettable total by entering the password “050873”.

• Once the Grand Total has been programmed as

“non-resettable” the feature CANNOT be
disabled.

If the correct six-digit password is entered, the meter
displays the message unLoc (unlocked) and the
protection is disabled until a new password is
programmed.

If the password entered is incorrect, the meter
displays the message Locd (Locked) for about two
seconds, and then it returns to Run Mode. To try
again, press Enter while the Locked message is
displayed.

Did you forget the password?

The password may be disabled by entering a
master password once. If you are authorized to
make changes, enter the master password 508655
to unlock the meter.

34

Series APM Analog Panel Meter Instruction Manual

Advanced Features Menu & Display Messages

Display

Parameter

Action/Setting

Filter

Set noise filter value

Bypass

Set filter bypass value

for display variables

parameters

address

Baud rate

Select baud rate

serial communication

with 1 or 2 stop bits

timeout

(function, cutoff, out)

horizontal tank function

points

points

32-point linearization

root extraction

Advanced Features Menu & Display Messages

Display

Parameter

Action/Setting

exponent value

calculation

(cm)

gallons or meters

diameter in inches

in inches

Cutoff

Set low-flow cutoff

total count direction

down

Count

up or down

grand total countdown

programming

parameters

4-20 mA output

display overrange

display underrange

loop break detected

value for loop break

condition

output allowed

output allowed

for scaling the output)

resolution

resolution

and digital I/O

key

key

key

Advanced Features Menu

To simplify the setup process, functions not needed
for most applications are located in the Advanced
Features menu.

Press and hold the Menu button for three seconds to
access the advanced features of the meter.

Prog E

rht

Programmable
exponent

Round
horizontal tank

Set meter for
programmable
exponent and enter

Set meter for round
horizontal tank volume

Advanced Features Menu &
Display Messages

The following table shows the functions and
messages of the Advanced Features menu in the
order they appear in the menu.

filter
bypASs
Round

seriAl

SlaV Id

baud
Tr dLY

Round

Serial

Slave ID

Transmit delay

Set the rounding value

Set serial
communication

Set slave ID or meter

Set transmit delay for

Inch

dianmr

Length

CutofF

Count

Tot C

Gtot C

C Strt

AoutPr

Source

O-rang

u-rang

Break

Force

Ignore

nmAx

nmin

Dimension

Diameter

Length

Count

Total Count

Grand Total

Count Start

Analog output

Source

Overrange

Underrange

Loop Break

Force

Ignore

Maximum

Minimum

Calculate volume in

Enter the tank’s

Enter the tank’s length

Set total and grand

Set total to count up or

Set grand total to count

Set start for total or

Program analog output

Select source for the

Program mA output for

Program mA output for

Set relay condition if

Force analog output

Ignore loop break

Program maximum mA

Program minimum mA

Parity

t-byt

SelEct

Functn

Linear

No PtS

Square

Parity

Time byte

Select

Input signal
conditioning

Linear

Number of

Square root

Select parity
Even, Odd, or None

Set byte-to-byte

Enter the Select menu

Select linear, square
root, programmable
exponent, or round

Set meter for linear
function and select
number of linearization

Set meter for 2 to

Set meter for square

35

Calib

4 nmA

20 nmA

user

F1

F2

F3

Calibrate

4 mA output

20 mA output

User I/O

F1 function

F2 function

F3 function

Calibrate 4-20 mA
output (internal
reference source used

Enter mA output value
read by milliamp meter
with at least 0.001 mA

Enter mA output value
read by milliamp meter
with at least 0.001 mA

Assign function keys

Assign F1 function key

Assign F2 function key

Assign F3 function key

Series APM Analog Panel Meter Instruction Manual

Advanced Features Menu & Display Messages

Display

Parameter

Action/Setting

(digital input)

modules connected

modules connected

without a signal source

for scaling the input)

input (e.g. 4 mA)

input (e.g. 20 mA)

calibration

input

input (e.g. 0 V)

input (e.g. 10 V)

settings

test)

number and version

meter’s memory

Rounding Feature (round)

The rounding feature is used to give the user a

F4

dI I

dO 1

ICal

C CAL

C lo

C Hi

v CAL

v Lo

v Hi

F4 function

Digital input 1

Digital output 1

Internal source
calibration

Current
calibration

Current low

Current high

Voltage

Voltage low

Voltage high

Assign F4 function

Assign digital input
1 – 8, if expansion

Assign digital output
1 – 8, if expansion

Enter internal source
calibration (used for
scaling the meter

Calibrating 4-20 mA
current input (internal
reference source used

Calibrate low current

Calibrate high current

Calibrating voltage

Calibrate low voltage

Calibrate high voltage

steadier display with fluctuating signals. Rounding is
used in addition to the filter function.

Rounding causes the display to round to the nearest
value according the rounding selected. See examples
below:

Rounding
Selection

1 12.022 12.022 12.023 12.023

5 12.022 12.020 12.023 12.025

10 12.024 12.020 12.025 12.030

Actual
Value

Display
Value

Actual
Value

Display
Value

Modbus RTU Serial Communications (serial)

The meter is equipped with serial communications
capability as a standard feature using Modbus RTU
Serial Communication Protocol.

The meter may be connected to a PC for initial
configuration via the on-board micro USB connection.
For ongoing digital communications with a computer
or other data terminal equipment, an RS-232, or RS­485 option is required; see Ordering Information on
page 6 for details.

Diag

LED t

Info

Erase

Diagnostics

LED test

Information

Erase

Display parameter

Test all LEDs
(press menu to exit

Display software

Erase Panel Meter Pro
software stored in

Noise Filter (filter)

The noise filter is available for unusually noisy signals
that cause an unstable process variable display. The
noise filter averages the input signal over a certain
period. The filter level determines the length of time
over which the signal is averaged. The filter level can
be set between 2 and 199. The higher the filter level,
the longer the averaging time and so the longer it
takes the display to settle to its final value. Setting the
filter level to zero disables the filter function.

Noise Filter Bypass (bypass)

The noise filter bypass changes the behavior of the
meter so that small variations in the signal are filtered
out but large abrupt changes in the input signal are
displayed immediately. The bypass value determines
the minimum amount of signal change to be displayed
immediately. All signal changes smaller than the
bypass value are filtered or averaged by the meter.
The noise filter bypass may be set between 0.1 and

99.9% of full scale.

• DO NOT connect any equipment other than

Dwyer’s expansion modules, cables, or meters to
the RJ45 M LINK connector. Otherwise damage
will occur to the equipment and the meter.

Note: More detailed instructions are provided with

each optional serial communications adapter.

Note: Refer to the APM Modbus Register Tables

located at www.dwyer-inst.com for details.

When using more than one meter in a multi-drop mode,
each meter must be provided with its own unique
address. The meter address (Slave ID) may be
programmed between 1 and 247. The transmit delay
may be set between 0 and 199 ms. The parity can be set
to even, odd, or none with 1 or 2 stop bits.

36

Series APM Analog Panel Meter Instruction Manual

Table 13-3

Head (Feet)

CFS

GPM

MGD

Function

Desire

Programming

Select Menu (SElEct)

The Select menu is used to select the input signal
conditioner applied to the input (linear, square root,
programmable exponent, or round horizontal tank),
low-flow cutoff, and analog output programming. The
multi-point linearization is part of the linear function
selection.

Input Signal Conditioning (Functn)

The Function menu is used to select the input signal
conditioner applied to the input: linear, square root,
programmable exponent, or round horizontal tank
volume calculation. The multi-point linearization is
part of the linear function selection.

Meters are set up at the factory for linear function with
2-point linearization. The linear function provides a
display that is linear with respect to the input signal.

Multi-Point Linearization (Linear)

Meters are set up at the factory for linear function with
2-point linearization. Up to 32 linearization points can
be selected under the linear function. The multi-point
linearization can be used to linearize the display for
non-linear signals such as those from level
transmitters used to measure volume in odd-shaped
tanks or to convert level to flow using weirs and
flumes with complex exponent.

The programmable exponent can be used to linearize
the signal from level transmitters in open-channel flow
applications using weirs and flumes.

The APM meter, in combination with an ultrasonic
level transmitter, makes for an economical way to
measure and display open channel flow rate and total
in most weirs and flumes. A guide such as the ISCO
Open Channel Flow Measurement Handbook can
provide the user with all the information needed: the
exponent used in the flow equation for the desired
flow units and the flow rate for any given head height.
For example, to display the open channel flow rate
from a 3" Parshall flume, the ISCO handbook advises
the exponent is 1.547 and at the maximum head
height of 3.0 feet, the flow rate is 3.508 MGD.

3" Parshall Flume Discharge Table with Head in
Feet

Formula: CFS = 0.9920 H

MGD = 0.6411 H
Where: H = head in feet

3.00 5.428 2436 3.508

ISCO Open Channel Flow Measurement Handbook, 3rd edition

With this information the APM should be programmed
in the following fashion. This setup assumes the level
transmitter is programmed to output 20 mA at the
maximum head height of 1.10 feet; but any mA value
at a head height with a known flow rate may be used.

Programmable Exponent
Linearization (

Prog E)

Application: Open Channel Flow

1.547

GPM = 445.2 H

1.547

1.547

Square Root Linearization
(

Square)

The square root function can be used to linearize the
signal from a differential pressure transmitter and
display flow rate in engineering units.

37

Open Channel
Flow

Flow Rate

Total

Non-Resettable
Grand Total

Display

3" Parshall flume

Millions of
Gallons per Day
(MGD)

Millions of
Gallons

Program meter
so grand total can
never be reset

Display Flow
Rate, Total, and
Grand Total

Set Programmable Exponent to

1.547

Set 4 mA = 0
20 mA = 3.508
Time base = Day

Set Totalizer Conversion Factor = 1
(password protect “total” to avoid
accidental reset)

Set non-resettable grand total
password

Set upper display for Grand Total
and lower display to toggle
between rate and total.

Series APM Analog Panel Meter Instruction Manual

Round Horizontal Tank
Linearization (

This function automatically calculates the volume in a
round horizontal tank with flat ends. This function is
only used when Total is set to no.

Set the display for the desired decimal point and
engineering units before entering the round horizontal
tank function. Select units, inches or cm for the tank
dimension. Enter the diameter and the length in
inches and the results are given in US gallons. Enter
the diameter and length in cm and the results are
calculated automatically in liters.

The meter can be scaled to display the volume in any
engineering unit.

Note: After Scale is displayed continue pressing the

Enter button until the meter completes the
scaling of the input and display values.

Changing the Volume from Gallons to Liters

In the above graphic, entering the 48" for the diameter
and 120" for the length of the round horizontal tank,
the meter automatically calculates that the volume of
the tank is 940.02 gallons.

1. Convert gallons to liters
1 US gallon = 3.7854 L

940.02 gal = 3558.4 L

2. Go to the Setup menu and change the decimal
point to 1 decimal.

3. Go to the Program – Scale menu and press Enter
until dis 2 is shown on the main display.

4. Press Enter and change the display 2 value to

3558.4.

5. The meter is now displaying the volume in liters.

Note: The display can be scaled to display the volume

in any engineering units.

Another way to display the volume in liters is to enter
the dimensions in cm. The meter automatically
calculates the volume in liters.

rHt)

Totalizer Count Up/Down (Count)

The totalizer count up/down menu may be used to
program the total and grand total to either count up
from 0 when reset or count down from a programmed
value when reset. Total and grand total may have
their countdown numbers programmed individually
from 0 to 999999.

Analog Output Programming (AoutPr)

The Analog Output Programming menu is used to
program the behavior of the 4-20 mA output. The
following parameters and functions are programmed
in this menu:

1. Source: Source for generating the 4-20 mA
output (e.g. PV)

2. Overrange: Analog output value with display in
overrange condition

3. Underrange: Analog output value with display in
underrange condition

4. Break: Analog output value when loop break is
detected

5. Max: Maximum analog output value allowed
regardless of input

6. Min: Minimum analog output value allowed
regardless of input

7. Calibrate: Calibrate the internal 4-20 mA source
reference used to scale the 4-20 mA output

Analog Output Source

The source for generating the 4-20 mA output may be
assigned to the rate/process variable, total, grand
total, maximum or minimum value reached by the
rate/process, or one of the set points, or the Modbus
PV input.

Low-Flow Cutoff (CutofF)

The low-flow cutoff feature allows the meter to be
programmed so that the often-unsteady output from a
differential pressure transmitter, at low flow rates,
always displays zero on the meter.

The cutoff value may be programmed from 0 to

999999. The meter will display zero below the cutoff
value. Programming the cutoff value to zero disables
the cutoff feature.

Analog Output Calibration

To perform the analog output calibration, it’s
recommended to use a milliamp meter with a
resolution of at least 0.1 µA to measure the output
current. The values saved internally during this
procedure are used for scaling the 4-20 mA output in
the Setup menu.

38

Series APM Analog Panel Meter Instruction Manual

Function Keys & Digital I/O Available Settings

Display

Description

Directly access the relay menu

Directly access the set point menu for
relay 1 (*through 8)

Disable all relays until a button

Rly E

pressed

Enable all relays to function as they
have been programmed

Rly E

pressed

to be calculated in the background.

Display maximum display value on line 1

Display minimum display value on line 1

Display maximum & minimum display
values on line 1

Display maximum display value on line 2

Display minimum display value on line 2

Display maximum & minimum display
values on line 2

Display the grand total on line 2

Function Keys & Digital I/O Available Settings

Display

Description

Force relay 1 (*through 4) into the on

page 32 for details.

Directly access the control menu

Disable the selected function key or
digital I/O

Acknowledge all active relays that are in

manual or latching

Directly access the reset menu

Reset the total

Reset the grand total

Reset the stored maximum display
value

Reset the stored minimum display value

Reset the stored maximum & minimum
display values

Mimic the menu button functionality
(digital inputs only)

Mimic the right arrow/F1 button
functionality (digital inputs only)

Mimic the up arrow/F2 button
functionality (digital inputs only)

Mimic the enter/F3 button functionality
(digital inputs only)

Provide indication when alarm 1

outputs only)

*If installed

Programmable Function Keys User Menu (user)

The User menu allows the user to assign the front
panel function keys F1, F2, and F3, the digital input
F4 (a digital input located on the input signal
connector), and up to eight additional digital inputs to
access most of the menus or to activate certain
functions immediately (e.g. reset total, reset grand
total, reset max & min, hold relay states, etc.). This
allows the meter to be greatly customized for use in
specialized applications.

Up to eight digital outputs can be assigned to a
number of actions and functions executed by the
meter (i.e. reset total, reset grand total, alarms, relay
acknowledgement, reset or display max, min). The
digital outputs can be used to trigger external alarms
or lights to indicate these specific events.

F On 1*

Contrl
disabl

AcH

Reset
Rst t
Rst gt
Rst Hi

Rst Lo
Rst HL

state. This function is used in
conjunction with a digital input
expansion module to achieve interlock
functionality. See

Interlock Relay (Force On) Feature

a manual operation mode such as auto-

Setting Up the

on

Function Keys & Digital I/O
Available Settings

Refer to the following table for descriptions of each
available function key or digital I/O setting.

relay
Set 1*

Rly d

Rly E

O Hold

d Hold

assigned to enable relays (

Hold current relay states and analog
output as they are until a button
assigned to enable relays (

Hold the current display value, relay
states, and analog output momentarily
while the function key or digital input is
active. The process value will continue

) is

) is

nmenu

rigHt

up

Enter

Alnm 1*

(*through 8) has been triggered (digital

Ln1 Hi
Ln1 Lo
Ln1 HL

Ln2 Hi
Ln2 Lo
Ln2 HL

Ln2 gt

39

Series APM Analog Panel Meter Instruction Manual

The meter is factory calibrated prior to shipment

Notes:

1. If meter is in operation and it is intended to

Input range

Input 1 & input 2 span

4-20 mA

0.15 mA

±10 VDC

0.10 VDC

Internal Source Calibration (ICAL)

for milliamps and volts with calibration equipment
that is certified to NIST standards.

The use of calibrated signal sources is necessary to
calibrate the internal source of the meter. The
meter’s internal source is what allows the user to
scale the meter without applying a signal.

Check calibration of the meter at least every
12 months. Each input must be recalibrated
separately.

accept only one input type (e.g. 4-20 mA),
recalibration of other input is not necessary.

2. Allow the meter to warm up for at least
15 minutes before performing the internal
source calibration procedure.

The Internal calibration menu is part of the Advanced
Features menu.

1. Press and hold the Menu button for three
seconds to access the advanced features of the
meter.

2. Press the Up arrow button to scroll to the Internal
calibration menu (ICAL) and press Enter.

3. The meter displays either current calibration
(C CAL) or voltage calibration (V CAL), according
to the input setup. Press Enter to start the
calibration process.

Example of Internal Calibration for current
input:

4. The meter displays low input current message
(C lo). Apply the low input signal and press
Enter. The display flashes for a moment while the
meter is accepting the low input signal.

5. After the display stops flashing, a number is
displayed with the leftmost digit brighter than the
rest. The bright digit is the active digit that can be
changed by pressing the Up arrow button. Press
the Right arrow button to move to the next digit.

6. Set the display value to correspond to the input
signal being calibrated, typically

4.000 mA.

7. The display moves to the high input calibration
(C Hi). Apply the high input signal and press
Enter.

8. Set the display for the high input calibration, in
the same way as it was set for the low input
calibration, typically 20.000 mA.

The graphic shows the calibration of the current input.
The voltage input is calibrated in a similar way.

Tips:

• Low and high input signals can be any valid
values within the range of the meter.

• Observe minimum input span requirements
between input 1 and input 2.

• Low input should be less than high input signal.
However, the low display can be higher than the
high display (i.e. 4-20 mA = 100.0 to 0.0).

Error Message (Error)

An error message indicates that the calibration or
scaling process was not successful.
After the error message is displayed, the meter
reverts to the input prior to the failure during
calibration or scaling and to input 1 during internal
calibration, allowing the appropriate input signal to be
applied or programmed.
The error message might be caused by any of the
following conditions:

5. Input signal is not connected to the proper
terminals or it is connected backwards*.

6. Wrong signal selection in Setup menu*.

7. Minimum input span requirements not
maintained.

8. Input 1 signal inadvertently applied to calibrate
input 2*.

*Not relevant when scaling the meter.

Minimum Input Span

The minimum input span is the minimum difference
between input 1 and input 2 signals required to complete
the calibration or scaling of the meter.

40

Series APM Analog Panel Meter Instruction Manual

Button
Symbol

Description

Meter Operation

The meter is capable of accepting current (0-20 mA,
4-20 mA) and voltage signals (0-5 V, 1-5 V, 0-10 V,
±10 V) and displaying these signals in engineering
units from -99999 to 999999 (e.g. a 4-20 mA signal
could be displayed as -50.000 to 50.000).

The dual-line display can be customized by the user
to operate in such a way as to satisfy a specific
application. Typically, the main display is used for the
process variable; while the second display is used for
engineering units, custom legend, total, grand total, or
set point indication.

The meter can be set up to display the analog input
on the main display and the Modbus input on the
second display. The relays and analog output can be
programmed to operate from the Modbus PV input.

Front Panel Buttons Operation

Press to enter or exit Programming
Mode, view settings, or exit max/min
readings

Press to reset max/min readings or
other parameter/function assigned
through the User menu

Press to display max/min readings or
other parameter/function assigned
through the User menu

Press to acknowledge relays or other
parameters/function assigned through
the User menu

Maximum/Minimum Readings

The max & min readings (peak & valley) reached by
the process can be displayed either continuously or
momentary:

1. Display briefly by assigning to the F1-F3 function
keys or to the digital inputs in the User menu.

2. Display continuously by assigning either display
to max/min through the Display menu.

Any of the F1-F3 function keys (buttons) and the
digital inputs can be programmed to reset the max &
min readings. The meters are set at the factory to
display the max reading by pressing the Up arrow/F2
button and to use the Right arrow/F1 button to access
the Reset menu.

To display max reading using function key with
factory defaults:

1. Press Up arrow/F2 button to display maximum
reading since the last reset/power-up.

2. To reset max/min press Right arrow/F1 button to
access the Reset menu. The max & min displays
are reset to actual values.

3. Press Menu to exit max/min display reading.

To display max/min readings continuously:

Assign either display to Max (d Hi), Min (d Lo), or
toggle between Max and Min (d HL) every 10
seconds.

Function Keys Operation

During operation, the programmable function keys
operate according to the way they have been
programmed in the Advanced Features – User menu.
See Programmable Function Keys User Menu (user)
on page 39 for details.

The table above shows the factory default settings for
F1, F2, and F3.

F4 Operation

A digital input, F4, is standard on the meter. This
digital input is programmed identically to function keys
F1, F2, and F3. The input is triggered with a contact
closure to COM, or with an active low signal. During
operation, F4 operates according to the way it has
been programmed in the Advanced Features – User
menu. See Programmable Function Keys User Menu
(user) on page 39 for details.

Totalizer Overflow Displays Total to 9 Digits

These flow rate/totalizers can display up to nine digits
of total flow with the total overflow feature.

In the diagrams above, the flow totalizer is displaying
532,831,470 by toggling between a display of
“oF 532” and “831470”. Notice the T with arrow ▲
symbol is lit up indicating the display is in overflow
mode.

41

Series APM Analog Panel Meter Instruction Manual

Troubleshooting

Due to the many features and functions of the meter,
it’s possible that the setup of the meter does not
agree with what an operator expects to see.

If the meter is not working as expected, refer to the
Diagnostics menu and recommendations below.

Diagnostics Menu (diag)

The Diagnostics menu is located in the Advanced
Features menu, to access Diagnostics menu see
Advanced Features Menu on page 34.

This menu allows the user to test the functionality of
all the meter LEDs, check the meter’s software and
version information, and erase the Panel Meter Pro
software installation files from the meter. Press the
Enter button to view the settings and the Menu button
to exit at any time.

For a description of the diagnostic messages, see
Advanced Features Menu & Display Messages on
page 35.

Determining Software Version

To determine the software version of a meter:

1. Go to the Diagnostics menu (diAG) and

press Enter button.

2. Press Up arrow button and scroll to

Information menu (Info).

3. Press Enter to access the software number

(SFT) and version (UER) information. Write
down the information as it is displayed.
Continue pressing Enter until all the
information is displayed.

4. The meter returns to Run Mode after
displaying all the settings.

Reset Meter to Factory Defaults

When the parameters have been changed in a way
that is difficult to determine what’s happening, it might
be better to start the setup process from the factory
defaults.

Instructions to load factory defaults:

1. Enter the Advanced Features menu. See
Advanced Features Menu on page 34.

2. Press Up arrow to go to Diagnostics (diAG) menu

3. Press and hold Right arrow for three seconds,
press Enter when display flashes reset.
Note: If Enter is not pressed within three
seconds, the display returns to the Diagnostics
menu.

4. The meter goes through an initialization
sequence (similar as on power-up), and loads the
factory default settings.

42

Series APM Analog Panel Meter Instruction Manual

Factory Defaults & User Settings

The following table shows the factory setting for
most parameters.

Parameter Display Default Setting

Input type

Total

Units

Filter

Bypass

Function

Number of points

Programming

Input 1

Display 1

Input 2

Display 2

Decimal point

Cutoff value

Display line 1

Display line 2

Display intensity

Total time base

Total conversion
factor

Total reset

Grand total time
base

Grand total
conversion factor

Grand total reset

Total count
up/down

Grand tot count

Relay 1
assignment

Relay 2
assignment

Relay 3
assignment

Relay 4
assignment

Input

total

units

filter

bypass

Functn

No Pts

prog

InP 1

Dis 1

InP 2

Dis 2

ddd.ddd

CutofF

Line 1

Line 2

d-Inty

T tb

T CF

T rst

GT tb

gT CF

gT rst

Tot C

Gtot C

Asign1

Asign2

Asign3

Asign4

4-20 mA

Yes

Rate / total / gr. total
mA / mA / mA

70

0.2

Linear

2

Scale

4.000 mA

4.000

20.000 mA

20.000

3 places

0.000 (disabled)

Rate/Process

Total value

6

Second

1.000

Manual

Second

1.000

Manual

Up

Up

Total

Total

Rate

Rate

Parameter Display Default Setting

Relay 1 action

Relay 1 set point

Relay 1 reset point

Relay 2 action

Relay 2 set point

Relay 2 reset point

Relay 3 action

Relay 3 set point

Relay 3 reset point

Relay 4 action

Relay 4 set point

Relay 4 reset point

Fail-safe relay 1

Fail-safe relay 2

Fail-safe relay 3

Fail-safe relay 4

Display 1 analog
out

Output 1 value

Display 2 analog
out

Output 2 value

Source analog
output

Overrange output

Underrange output

Loop break output

Maximum output

Minimum output

F1 function key

Password 1

Password 2

Password 3

Total password

Grand total
password

Act 1

Set 1

RSt 1

Act 2

Set 2

RSt 2

Act 3

Set 3

RSt 3

Act 4

Set 4

RSt 4

Fls 1

Fls 2

Fls 3

Fls 4

Dis 1

Out 1

Dis 2

Out 2

Source

O-rang

u-rang

break

nmAx

nmin

F1

Pass 1

Pass 2

Pass 3

Total

Gtotal

Automatic

1.000

0.000

Automatic

2.000

0.000

Automatic

3.000

2.500

Automatic

4.000

3.500

Off

Off

Off

Off

4.000

4.000 mA

20.000

20.000 mA

Rate/process

21.000 mA

3.000 mA

1.000 mA

23.000 mA

1.000 mA

Reset max & min

000000 (unlocked)

000000 (unlocked)

000000 (unlocked)

000000 (unlocked)

000000 (unlocked)

43

Series APM Analog Panel Meter Instruction Manual

Symptom

Check/Action

No display at all

Check power at power connector

Not able to change setup or programming,

is displayed

Meter is password-protected, enter correct six-digit password to
unlock

If a Low-Flow Cutoff Value has been programmed, the meter will

cutoff value.

Check:

3. Minimum input span requirements

Meter displays

2.

2. Corresponding signal at Signal connector

Check:

3. Filter and bypass values (increase)

Display response is too slow

Check filter and bypass values

Check:

2. Scaling or calibration

Display does not respond to input changes,
reading a fixed number

Check:

Display assignment, it might be displaying max, min, or set point.

Display alternates between

2. Lo and a number

Check:

2. Wiring of relay contacts

Check:

2. Set and reset points

Flashing relay status LEDs

Relays in manual control mode or relay interlock switches opened.

Check:

3. Meter address and baud rate

If the display locks up or the meter does not
respond at all

Other symptoms not described above

Call Technical Support for assistance.

Troubleshooting Tips

This meter is a highly sophisticated instrument with an extensive list of features and capabilities. If the front panel
buttons are used to program the meter, it may be a difficult task to keep everything straight. That is why we strongly
recommend the use of the free Panel Meter Pro software for all programming activities. A cable is provided with the
meter for programming with Panel Meter Pro software.

If you have programmed the meter with the front panel buttons and it is not working as intended, try re-programming
the meter using Panel Meter Pro software.

Locd

display zero below that point, regardless of the input – which can

Meter does not respond to input change

appear like the meter is not responding to an input change. Check to
make sure the problem is not being caused by an undesired low-flow

Meter displays error message during
calibration (Error)

1. 999999

-99999

Display is unstable

Display reading is not accurate

1. Hi and a number

Relay operation is reversed

Relay and status LED do not respond to
signal

1. Signal connections

2. Input selected in Setup menu

Check:

1. Input selected in Setup menu

1. Input signal stability and value

2. Display scaling vs. input signal

1. Input signal conditioner selected: Linear, square root, etc.

Press Menu to exit max/min display readings.

1. Fail-safe in Setup menu

1. Relay action in Setup menu

Meter not communicating with application
programs

Note: Certain sequences of events can cause unexpected results. To solve these issues, it is best to start fresh from
factory defaults and use the manual as a step by step programming guide, rather than a random approach to
programming. To reset the meter to factory defaults, see Reset Meter to Factory Defaults on page 42. In addition, for
best results, we recommend using the free Panel Meter Pro software for all programming needs.

1. Serial adapter and cable

2. Serial settings

Cycle the power to reboot the microprocessor.

44

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, IN 46360, U.S.A.

Fax: [phone]

e-mail: [e-mail]

07/20

Phone: [phone] dwyer-inst.com

LIM6200DW_H

SFT039 Ver 4.010 & up