GM-4
Gas Monitor Readout/Alarm

The GM-4 is a multi-channel stand-alone monitoring/safety system that supports up to four (4) Manning Systems gas detection sensors and can interface with the plant central safety controls. The new GM-4 is an economical solution for the smaller installation (2-4 sensors). You get all the same great features of the GM-10 at about half the cost. It is designed as a complementary system to the GM-10 when only a few additional sensors are required.

Modular construction allows easy addition of one or two Relay Output Boards (providing up to 16 extra relay outputs) and a GM-4-AOB Analog Output Board for individual 4/20 mA output from each channel (total of 4).

Typical Specs includes CAD and PDF drawings for a GM-10 (CAD / PDF) and GM-4 (CAD / PDF) to assist you in integrating them into a complete system design. The drawings include wiring layouts for a selection of electrochemical, infrared and vent line sensors, with typical output control functions and auxiliary alarm or power backup equipment.

General Description

The GM-4 will support any combination of Manning Systems fixed sensors for gases, including NH₃, CO₂, H₂, CO, Cl₂, CFCs, HCFCs, HFCs, CH₄, O₂ and more.

Gas selective sensor technologies measure selected PPM setpoints from OSHA's Permissible Exposure Limit (PEL) and the Threshold Limit Value/Short-Term Exposure Limit (TLV-STEL) up to the Lower Explosive Limit (LEL) range and indicate concentration levels with bargraph displays.

Field adjustable setpoints for each channel allow the operator to easily set or adjust warning and alarm trip levels at the main control panel.

Each channel of the GM-4 multi-channel unit has a 20 segment LED bargraph display of gas concentration, a Warning LED, Alarm LED, and Fault LED.

The base unit has four common relays (Warn, Alarm, Fault, Horn) which trip when any channel goes into the associated condition. Warning and Alarm LEDs and relays are DIP switch selectable to latch or not latch.

Unlike sample draw systems, gas detection by diffusion method gives continuous monitoring of all protected areas simultaneously. This system meets the most stringent leak detection requirements and indicates gas concentration status for all sensors at a single glance. The GM-4 can interface to, but operates independently of, plant control systems. It offers the ultimate in reliability and ease of maintenance for the smaller installation.

The Manning Primary Safety System (MPSS) is a total, turnkey solution for the detection of toxic gas leaks showing gas safety status of an entire industrial facility at a single glance. It provides a "hardened" gas safety equipment system utilizing dedicated MPSS electrochemical and infrared sensors connected in realtime to GM-10, GM-4 or GM-1 dedicated central gas alarm monitors – all protected by a single uninterruptible power system. Multiple relays trigger key emergency safety control of equipment shutdown functions and allow Emergency Responders to easily assess an ammonia or other gas leak situation - even in the event of computer viruses, operating system crashes or human error.

Download brochure or contact Manning Systems for complete specifications.