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This battery holder was designed specifically for use in hazardous environments. It contains an internal current limiting circuit whose
function it is to restrict the amount of power that the unit can supply, even if its outputs are shorted together. The battery holder is
highly impact resistant, and designed to keep gasses, dust and other foreign materials out. When replacing batteries, you must ensure
that there are no foreign materials inside the holder, and that the correct battery has been installed with the proper polarity.
Factory Mutual (FM) requires that the battery holder be designed in such a way as to eliminate any possibility of the holder coming
apart and ejecting the battery if the unit is dropped or impacted sharply. In order to maintain this integrity, the cover must be securely
fastened after installing the battery. Do not over tighten. Hand tightening is satisfactory. Failure to do so may cause the unit to eject
the battery if the unit is dropped. The battery must never be exposed while it is located in a hazardous area.
AT NO TIME WHATSOEVER SHOULD THE BATTERY COVER BE OPENED WHILE THE SCALE IS LOCATED IN A HAZARDOUS AREA. DOING
SO WOULD VIOLATE THE INTRINSICALLY SAFE DESIGN, POSSIBLY CAUSING AN EXPLOSION RESULTING IN SERIOUS INJURY OR
DEATH.
Battery Charging
Batteries can be recharged using any standard charger designed to charge a 2000-2600 mAh NiMH AA cell. A charger is also available
from Arlyn Scales. Most commercial chargers cannot charge a single battery so batteries are commonly charged in pairs.
The battery section explains this in more detail below.
Caution
To remove the battery, the indicator must first be moved to a safe area.
•
Place the power switch in the OFF
or “0”
position.
•
Disconnect the load cell cable from the upper right side of the indicator.
•
Loosen the thumbscrew and slide the indicator ho
using off of the “L” shaped mounting bracket.
•
Remove the indicator from the hazardous area.
•
Once in the safe area, the battery may be removed and charged.
•
Visually inspect the inside of the empty battery holder to ensure that there are no foreign materials inside. Also check to
verify that there is no damage to any of the internal components.
•
Insert a charged battery into the holder “PLUS” end first. Tighten the cover securely.
External Power Operation
The MKE-5-IS Display Indicator can be configured with the ability to be powered by an IS power supply or power supplies through
certain approved barriers with matching Entity Parameters. See Doc #4013
–
Installation and Wiring Diagram for further details. This is
an optional method of powering the display indicator, available for purchase.
A typical external power supply configuration is a 4.3V DC supply from a safe (or unclassified area) passing through an ARL-BR-IS-PWR-
(LC)
safety barrier before entering the indicator’s external power cable.
External Power Safety Considerations
•
Make sure the external power source matches the entity parameters and specifications of the MKE-5-IS Digital Indicator.
•
If using a Safety Barrier, only approved barriers with matching parameters can be used for this operation.
AT NO TIME WHATSOEVER SHOULD THE MKE-5-IS DISPLAY INDICATOR BE POWERED DIRECTLY FROM AN UNCLASSIFIED OUTLET OR
AN UNMATCHED APPROVED SOURCE OR BARRIER. DOING SO WOULD VIOLATE THE INTRINSICALLY SAFE DESIGN, POSSIBLY
CAUSING AN EXPLOSION RESULTING IN SERIOUS INJURY OR DEATH.
Switching Between External Power and Battery Operation
The indicator can only be powered using one power source at a time. All MKE-5-IS Display indicator units are equipped with a 3-state
SPDT (single pull double throw) rocker switch on the side of the indicator. The rocker switch is mapped as follows:
Do not attempt to remove the battery cover while the unit is located in a hazardous area. Doing so
will violate intrinsic safety, possibly causing an explosion or fire resulting in death or serious injury.
