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LIFE MONITOR FUNCTIONBATALMDischargeElementNormalNear EndEnd of LifeNormalDegradedReplacementNo NeedNearBatteryNormalNormal: ONDischarged1*1*: OFFVoltageLimiterImmediatelyRequiredUnable to JudgeWith pulsating line signal or that containing ripples, the LED may flicker or blink when the voltage limiter is degraded.ElementBaseCHK Check ButtonBAT Indicator LEDALM Indicator LED■ LIFE INDICATIONIndicators (Activated by CHK [Check] button) BAT (battery): Green LED ALM (alarm): Red LEDDischarge element status table12Lightning Surge Protectors with Life MonitorWithout question, the main complaint in the industry with regard to lightning surge protectors is the difficulty in determining whether the lightning surge protector installed to protect your control system components is still functional.Consider opening a panel with a large number of surge suppressors. Instead of unplugging and testing ev-ery unit, for M-Systemʼs life monitor series models MDPA-24 and MDPA-65, all that is necessary is a quick visual inspection with a push button. No further tools or checking are required.The lightning surge protector models MDPA-24 and MDPA-65 monitor not only the number of suppressed surges across the signal lines but also the leakage current from signal to ground which gives you more pre-cise warning than most typical surge protectors monitoring only the number of suppressed surges. When a predetermined level of either the leakage current or number of suppressed surges is exceeded, respective indicators illuminate with a prompt of the ʻTestʼ button.Low in cost, these devices pay for themselves by providing early warning alarms and reducing ongoing un-necessary panel maintenance. When it comes to comparing the cost of downtime versus lightning surge protector replacement, the choice is obvious.If you already have M-Systemʼs models MDP-24-1 or MDP-65-1 installed in your instrumentation panels, re-placing only their element modules with ones for the MDPA-24 or MDPA-65 upgrades the system to life mon-itor very economically.If you need to be alerted automatically and remotely of the surge protectorʼs life, the auxiliary powered mod-els MDM2A-24 and MDM2A-65 can provide an alarm contact output.How many surge devices does your company have installed that are potentially in poor health and still ‘protecting’ your control system?• Designed specifically for 4-20 mA DC and pulse signal line including 4-wire/2-wire transmitters. • Battery powered life monitoring system includes a ʻTestʼ button with indicators alerting panel inspectors of the surge protectorʼs ʻhealth.ʼ • Upgrades M-Systemʼs MDP-24-1 to the life monitor type simply by replacing the pluggable element module with one for the MDPA-24.

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