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Marine Electrical Products

DC Digital Meters

Single-Function Meters

8235 DC Digital Voltmeter

8236 DC Digital Ammeter

8248 DC Digital Multimeter with Alarm

8251 DC Digital Voltmeter with Alarm

Multi-Function Meters

2.88

SET

2.88

1) Physical: The meter should be located in

a visible position with easy access for

operation of the pushbuttons. The display

has adjustable brightness for various lighting

conditions, but for best visibility do not place

the meter in full daylight. The location should

also be dry and protected. The face is splash

proof and its circuit boards are coated for

corrosion resistance, but it is not intended for

use in very wet environments or for

installation outside without additional

protection. Additionally, the wiring should be

located in safe and dry raceways with

appropriate strain relief.

2) Safety: Installation requires the ability to

make high current capacity connections, as

well as connections directly to the battery

positive terminal. These connections must

be made carefully and fused as indicated in

wiring diagram. When working on the battery

be sure to wear safety glasses, turn off all

charging sources, and be careful not to

create sparks which might ignite battery

gases. The scope of this document does not

include instruction in the basic electrical skills

necessary to install the meter. If you do not

have the necessary basic skills you should

employ a qualified electrician.

Installation Overview

Upon power up the meter goes through

a self test sequence which lights all the

function LEDs, then all segments of the

display.

All Models: Startup Sequence

Pressing the button causes the display to

dim. There are three levels of brightness.

Models with a single button also have a

fourth sleep mode in which the display is off

with the exception of a single decimal point.

Models with three buttons have an automatic

sleep mode, which is accessed through the

menu as described in the manual.

2.88

All Models: Using Button for Dimming

The arrow buttons have two functions.

Normally they change the display between

Volts and Amps. When in the MENU mode

they are used to navigate through the

functions or adjust the values.

The center button has three functions.

Normally it is used to dim the display. Holding

the button for 2 seconds will access the

MENU and while in the MENU mode,

pressing it is used to SET or store the

displayed value to memory.

SET

Press to select a

MENU mode or

to SET a value

to memory

Hold for 2 seconds

to access the

Press arrow

buttons to display

Volts or Amps

In MENU use to adjust values.

Three Button Models

The Scan mode will automatically scroll

the display between Volts and Amps

displaying each for about 3 seconds. If the

arrow buttons are pressed the Scan

mode is temporally suspended and the

buttons may be used to manually scroll

through the measured parameters. If no

button is pressed for 10 minutes the Scan

mode is resumed.

To access the Scan mode, hold the

button for two seconds. Use the arrow

buttons to scroll until Sc is in the display.

Press to select the Scan mode. Use the

arrow buttons to select or off.

(Default OFF) Press the button to save the

selection to memory. Two short beeps will let

you know you have successfully set the

function and the meter will revert to the last

displayed function.

SET

Scan Mode - SCA

Specifications

Voltage is an indicator of state-of-charge

only when a battery's open circuit voltage is

measured. Open circuit voltage is obtained

when a battery is neither being charged nor

discharged and the voltage is allowed to be

stabilized. There is disagreement about the

length of time the battery is required to rest

before a usable open circuit voltage is

obtained. However, the user will observe that

in the first 10 to 20 minutes of rest the

voltage will settle to a figure close to its

completely rested open circuit voltage, which

is generally considered to be obtained after

24 hours. Gel batteries can take up to 48

hours. With experience, the user will learn

the time required for reliable readings on any

particular system.

For maximum life a battery should be

discharged no more than 50%. Once a

battery is about 80% of full charge, its

acceptance rate decreases rapidly and it can

take a long time to bring the charge to 100%.

For this reason, the practical operating range

becomes the 50 - 80% of charge area.

A particularly good treatment of battery

management is presented in Nigel Calder's

book, Boatowner's Mechanical and Electrical

Manual (Third Edition, McGraw Hill).

Set the meter to display voltage using

the arrow buttons. The V function LED

will be on. Hold the button for two seconds

to access the MENU. Use the arrow

buttons to scroll until HI is in the display.

Press to select the High Voltage Alarm.

Use the arrow buttons to select

or off (Default OFF). Press the button to

save the selection to memory and continue.

SET

Flashing

SET

H I

High Voltage Alarm - HI

The present setting will appear in the

display (Default 14.80). If the set point is

acceptable, press the button or wait for 15

seconds and the meter will revert to normal

operation. Otherwise use the arrow

buttons to select the desired value. For

example, press and hold the right button to

scroll up to 14.90.

SET

4.80

Flashing

Press the button when the desired set

point is displayed and the new value will be

saved to memory. Two short beeps will let

you know you have successfully set the new

value and the meter will revert to normal

operation.

SET

4.90

Flashing

SET

Flashing

SET

Flashing

Press to continue, or will appear.

Press arrow until is displayed.

Press button to continue. The present

setting will be displayed. (Default 10.80) Use

arrow to select the LO alarm value, press

to store to memory.

Setting the LO alarm is exactly like setting

the HI alarm. First select the V function

old down the button for 2 seconds to enter

the menu. Use the

to scroll until lo appears in the

display.

, then

arrow

SET

0.80

Flashing

Low Voltage Alarm - LO

If an alarm occurs, the audible alarm will

sound and the display will alternate between

the type of alarm and the measured value.

Silence by pressing button. Display

will alternate between the alarm condition and

the value. Every 5 minutes the alarm will give

four beeps and display the alarmed

parameter. This will continue until the alarm

condition is cleared, or the alarm function is

turned off, or the set point changed.

If in Sleep an alarm will “wake up” the

meter and it will function as above. After 10

minutes of no acknowledgement it will re-

enter the Sleep mode. Every 5 minutes it will

give four audible beeps and display the

alarmed condition and measured value for 30

seconds before returning to Sleep mode.

the

Display Alternates

SET

0.00

Acknowledging an Alarm

The Sleep mode is a simple power-

saving feature. If there are no button

presses for 10 minutes the display goes to

sleep and only a single decimal point is lit.

Pressing any button causes the meter to exit

the sleep mode and revert to the last

displayed function.

se the

arrow buttons to select or off.

(Default OFF) Press the button to save the

selection to memory. Two short beeps will let

you know you have successfully set the

function and the meter will revert to the last

displayed function.

To access the Sleep mode, hold the

button for two seconds. Use the arrow

buttons to scroll until Slp is in the display.

Press to select the Sleep mode. U

SET

SLP

Sleep Mode - SLP

The 8200 Series meters incorporate

microprocessor control and advanced

electronics specifically designed for power

monitoring to provide accurate metering with

a variety of adjustable user features. DC

meters have the provision for separate power

and voltage sensing. Using separate voltage

sensing is recommended to minimize the

voltage drop caused by the current

consumption of the meter itself. This is

particularly necessary if the meter is located

more than a few feet from the battery or

source being measured.

Models that have the ability to measure

DC current come with a precision shunt. The

shunt must be installed in the negative line to

avoid damage to the meter. The shunt is a

precise resistance that is temperature stable.

It has a full current rating of 500 Amps and

when 500 Amps flows it generates a voltage

of 50 mV (0.050 V). Thus, 10 Amps

generates 1.0 mV, 1 Amp generates 0.1 mV,

and 0.1 Amp generates only 0.01 mV. This is

a very small signal and you must be sure that

all connections are secure and well made. It

is also necessary to use twisted pair wire to

minimize susceptibility to electrical system

noise.

Theory of Operation

A full discussion of the subject of battery

management is beyond the scope of these

instructions. However, the following will alert

meter users to some of the issues requiring

further study.

Battery management is the key to a

healthy electrical system. There are several

ways to measure the state of charge in a

battery or battery bank. The three most

common methods are:

1. Open Circuit Voltage

2. Electrolyte Specific Gravity

3. Net Amp-Hours

Voltage is an effective method of

determining charge condition when properly

used with an understanding of the battery

charge and discharge process. The table

below shows the state of charge for different

type batteries. Please note the difference

between a full and a discharged battery is

about 1 volt.

State of

Charge

Wet

Cell

AGM

100%

75%

50%

25%

12.7-12.6

12.40

12.20

12.00

11.80

12.95-12.85

12.65

12.35

12.00

11.80

Open Circuit Voltage vs. State-of-Charge

Use

12 Volt Battery Open Circuit Voltage

Gel

Cell

12.90-12.80

12.60

12.30

12.00

11.80

Note: Divide values in half for 6-volt batteries.

CAUTION

The shunt must be installed in the negative

line to avoid damage to the meter. Positive

voltage applied to terminals #4 and #5 will

cause damage not covered by warranty.

Models that have the ability to measure

DC current are supplied with a precision

shunt. The shunt must be installed in the

negative line of the circuit whose current you

wish to measure. For marine and RV

applications this will normally be in the

negative line of the battery that supplies the

domestic systems. The current must flow

through the shunt to be measured. For

example, if you connect the negative return

wire of a load or source directly to the battery

its current will not be measured.

To attain the most accurate reading the

shunt must be located adjacent to the battery,

avoiding long battery cables. Break the circuit

at this point and install the shunt by

connecting the ends of the wire under each of

the two large bolts at the top of the shunt. It

makes no difference which wire is attached to

which bolt. The small screws are for the

meter sense leads and should have no

current-carrying connections made to them

as this will affect measurement accuracy.

Use this simple example: Disconnect

everything from the battery negative and

connect it to one side of the shunt; this is now

referred to as the Load side of the shunt.

Run a single cable capable of carrying the

maximum combined current of all loads

between the other side of the shunt and the

battery negative; we will call this the Battery

side of the shunt. This cable must be as big,

or bigger than the largest cable connected to

the Load side of the shunt.

Installing Shunt

General:

Display Character Size 9/16"

Power Supply Voltage 8-50V DC

Maximum Power Consumption 1.00W*

Minimum Power Consumption 0.60W*

(Sleep mode PN 8248 and PN 8251 Only)

Voltage Measurement:

Range 0-60V DC

Resolution 0.01V DC

Accuracy (% of Reading) ± 0.5%**

Current Measurement:

Shunt 500A-50mV

Range ± 500A DC

Resolution (-100 to -500) 1A DC

Resolution (-99.9 to +500) 0.1A DC

Accuracy (% of Reading) ± 0.5%**

Physical:

Splashproof front

Dimensions Height 2.431" (61.75mm)

Width 2.896" (73.56mm)

Depth 3.400" (86.36mm)

* Variable with voltage, display intensity,

segments illuminated, and sleep mode

**± 1 least digit of resolution

Caution:

Positive voltage applied to terminals #4 and

#5 will cause damage not covered by

warranty.

Displaying the Code Revision

For customer service convenience, all models

are able to display the revision of software

installed in the meter. To see the software

revision for meters with a single button, press

and hold the center ( ) button. To see the

revision on meters with three buttons, press

and hold the two buttons. In either

case, the power-up test will be performed and

the software revision will be displayed.

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Voltmeter Panel

8051 DC Digital Voltmeter Panel

Summary of content (2 pages)

PAGE 1
Marine Electrical Products DC Digital Meters Single-Function Meters 2.88 V 8235 DC Digital Voltmeter 8236 DC Digital Ammeter Multi-Function Meters 2.88 MENU V A SET 8248 DC Digital Multimeter with Alarm 8251 DC Digital Voltmeter with Alarm Voltmeter Panel 8051 DC Digital Voltmeter Panel Specifications General: Display Character Size 9/16" Power Supply Voltage 8-50V DC Maximum Power Consumption 1.00W* Minimum Power Consumption 0.
PAGE 2
Wiring Diagram Mounting Methods BACK OF THE METER 1 Terminal Block 123456 #3 Bolt Battery Shunt Fuse (0.5A to 2.0A) (typical two places) #2 TO BATTERY SWITCH DO NOT INSTALL SHUNT IN POSITIVE 1.50" MAX 38.1mm TO BATTERY SWITCH Battery 0.650" 16.51mm 123456 STEP 1 PN 8236 Fuse (0.5A to 2.0A) (typical two places) #2 Screw FROM NEGATIVE DC DISTRIBUTION (ALL LOADS AND SOURCES) LOCKING RING MUST GO ON BEFORE MOUNTING NUT 2.750" 69.