WITH AUTOMATIC FAULT DETECTING|
This instrinsically safe system consists of sensor probes, individual annunciator/fault detector modules (above, center) and a NEMA 12 control cabinet enclosure with door-mounted annunciator, alarm horn and input power indicator panels (above, right). The sensor probes are available in all stainless steel (above, far left) and as a standard epoxy head with a stainless head barrel and an extender pipe (above, second from left).
MMC's Self-Testing High and Overflow Alarm Systems provide an effective means for monitoring critical internal tank conditions at both industrial and maritime facilities. Approved by Factory Mutual as intrinsically safe for hazardous environments, the piezo electric crystal units can be used with a wide range of tanked industrial fluids. Standard probes are provided for use with non-corrosive materials, while stainless steel versions are available for use with chemicals and corrosives. All sensors are designed for "self testing" by the unique and intelligent circuits of each individual station annunciator module.
Each monitored level consists of a sensor probe, Zener safety barrier and annunciator module. Separate power supplies and horns are provided for HIGH and OVERFLOW systems. The standard HIGH and OVERFLOW power supplies can handle up to 20 annunciator and probe combinations. The systems share common "fluid level" and "station fault" alarms as well as a common control cabinet and safety barrier compartment.
Each station module gives an immediate indication of tank conditions with the individual stations' split-legend-push-button-acknowledge switch lighting up with either an "above" or "below" fluid level alert. When an alarm condition occurs, the red "above" legend begins to flash rapidly and a local horn sounds until the condition is acknowledged. After acknowledgement, the flashing red legend goes to steady on and remains on until the condition is corrected. At that time, the local horn is also silenced. When the situation is corrected or the fluid level drops below a pre-set limit, the amber colored "below" legend is steadily lighted.
Station and sensor faults are similarly announced with flashing red LED indicators and an intermittent horn of a different tone.
All systems are built in strict accordance with the latest U.S. Coast Guard regulations and have received American Bureau of Shipping (ABS) system installation approval.
Along with the audible and visual alarms, each system comes ready to accept a customer-supplied emergency power source. Each system is also configured to support optional functions including remote alarm horns, strobe lights and local deck alarm horn silencer switches.
Standard input power is 115 V (AC), 60HZ, 3 amps. 220 V (AC) is available as an option. The units support (customer-supplied) emergency power input of 115 V (AC) or +24 DC.