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Safe Shutdown with the FM Approved Safety Limiter
With Status Retention on Power-On Condition
The Safety Limiter of the Ascon’s “gammadue”Ò series is designed to meet the requirements of safety applications in the thermal market to limit an oven or furnace temperature where a runaway condition may compromise operator safety, equipment or product.
In a typical ‘High Limit’ application the operator sets the limit set point few degrees below the temperature that would cause an unsafe condition. If set point is reached the Safety Limiter output relay contact opens to shutdown the heat source. The relay will not automatically reset after the temperature goes below the set point value; the operator must manually either push the ‘reset’ key or a remote reset switch.
The Safety Limiter also includes a relay or SSR output to actuate an alarm. The Safety Limiter is approved by Factory Mutual (FM) under the category ‘Fuel and Combustion Controls’ section ‘Fire Protection’ in the FM “Approval Guide”.
Two models are available, the M4 with 48X48mm front size and the C1 with 48X24mm front size for applications requiring space-saving but including features typically found only in larger models. All the models can be configured to have Status Retention on Power-On condition. Front panel protection is IP65.
The FM approved Safety Limiter guarantees the best in safety of ovens and furnaces and, in some cases, lower costs on insurance premiums.
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Single-Loop Limit and Alarm Controllers
Watlow limit controllers provide agency approved performance in safety limit applications, including UL®, CSA, A.G.A. and FM (on some models). All are available with industry standard I/O options. All Watlow limit/alarm controllers are designed and manufactured to withstand harsh industrial environments, and come with a three-year warranty for Control Confidence®.
Applications
High and low safety limit control
Environmental chambers
Furnace/ovens
Semiconductor
Boiler
Multi-Loop Limit and Alarm Scanners
The Watlow multi-loop limits and alarms are a low-cost solution for multi-channel, redundant temperature monitoring. These limits and alarms can continuously monitor thermocouples, RTDs or thermal switches, making them ideal for multi-zone applications.
Applications
Any process requiring multi-channel redundant temperature monitoring
Semiconductor capital equipment
Electronics packaging equipment
Plastics injection molding and extrusion equipment
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The liquid filled measuring system changes its volume as a function of temperature changes. A changeover contact therefore is actuated by mechanical transmission.
In case that the setpoint is overflow the controller switches off. After the temperature drops below the setpoint the temperature controller can be reset manually.
When the system leaks the temperature controller remains in the off-position. When the sensor temperature drops below the minimum the circuit opens but closes again when the temperature rises.
Explosion protection CENELEC, IEC
Can be used in Zone 1 and Zone 2, in Zone 21 and Zone 22
Liquid filled measuring system
Continuous interruption when setpoint overflow (manual reset)
Continuous interruption when measuring system is leaking
Expanded security in accordance with DIN 3440
Enclosure made of glass fibre reinforced polyester resin
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