The Loop Leader PD6600 series features models with UL intrinsically safe and nonincendive and ATEX/IECEx intrinsically safe approvals, making the devices suitable in hazardous areas. The two-wire, loop-powered indicators include output options such as dual solid-state relays, 4-20 mA isolated analog retransmission and two open collector transistors, as well as advanced alarm and pump control features. The process meters can be used for single pump control or multi-pump alternation based on last run pump or a pump timer to share pump load. The rate/totalizers can display the total or grand total or function as batch controllers with start, stop and pause functionality.