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136

METERS

Flat panel mount

Surface mount

M2 OLED Digital Meters

The M2 Organic LED Digital Monitor measures essential electrical

system parameters with adjustable alarms and an auto-dimming

display. The M2 Monitors include a MOSFET External Circuit Relay

(ECR) which can be used to control external circuits based on any

value measured by the M2.

• Auto-dimming, bright Organic LED display is easy to read

• 80dB alarm on all models

• Isolated 500mA MOSFET relay

• Includes external DC Shunt or AC Current Transformer when required

Specifications

Display Size

55mm x 28mm

Power Supply Voltage

7–70V DC*

Range

(Power Consumption)

0.3W–1.0W

* Variable with voltage, display intensity,and sleep mode

Regulatory

Monitor face is IP66 - protected against powerful water jets

when installed according to instructions

Related Products

ML Series Remote

Battery Switches

p. 39

Floyd Bell Turbo Series Alarm

p. 148

M2 OLED Surface Mount

M2 OLED Mounting Options

Nut

Finger

Tighten

Only!

Locking ring

MUST go

on before

mounting nut

B U L K H E A D

1" MAX

Panel

Thickness

(25mm)

2.37"

(60.07mm)

0.72"

(18.31mm)

Mounts in a 2-1/8"

(54mm) DIA Hole

Gasket Seal

1830

1525

(meter not included)

PN Description

Width

in (mm)

Height

in (mm)

1525

360 Blank Panel - M2 OLED 4.88 (123.83)

4.75 (120.65)

State-of-Charge

Battery State-of-Charge (SoC)

Knowing the State-of-Charge of your battery is like knowing the

amount of fuel in your gas tank. To avoid getting stranded with a

dead battery, accurate battery bank monitoring is essential.

Voltmeter Method—

Voltage can be used to measure of the

SoC of your battery. The difference from a fully charged battery to

a fully discharged battery is only 1.0V in a 12V system, so the meter

must have good resolution and accuracy. This method is generally

sufficient to monitor batteries which experience intermittent use,

such as starter or thruster batteries. However, a battery must

not have been charged or discharged for over 12 hours for this

measurement to be trustworthy. This makes the Voltmeter Method

unsuitable for monitoring house batteries which charge and

discharge often.

Amp-Hour Method—

A convenient and accurate way to measure

SoC is with an Amp-Hour Monitor. This is a complex calculation of

the energy available, energy consumed, and energy returned to the

battery during charging. SoC can be expressed as amp-hours used,

amp-hours remaining until the battery is empty, or time remaining

until the battery is empty. The advantage of this method is that it

works well for batteries in a constant state of charge and discharge.

DC Shunts

p. 145

AC Current Transformer

p. 145

Universal Temperature

Sensor

p. 145