Limit Controllers | Temperature Control

Limiters and monitors provide control and safety cut-out capabilities to protect personnel, products and machinery against high or low temperatures. These devices are used in process control applications where independent limit switching for over or under temperature is required. They allow users to define upper or lower limits by entering setpoint values. If the pre-set temperature limit is exceeded, the output switches to ensure that the system is in a safe state. For example, the limit or monitor device can shut the system down or trigger forced cooling. Applications that often require limit and monitoring devices are ovens, furnaces, combustion plant, steam systems and food heating equipment, to name a few.

Thermal process applications often require monitors and limiters to be type tested to appropriate standards, such as EN14597-1, FM3454 and SIL2. West Control Solutions offers a comprehensive range of devices, from simple, cost-effective units to high-end solutions.

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Several factors should be considered in selecting the correct device: limit device and machinery standards, risk assessment or legislation defining the safety integrity level and the mounting style needed for a machine. Download here to find out more.

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Product	DIN Size	No. of Outputs	Control Type	Features	Certs.
STB 50 Limit Controller	1/8 DIN 96 x 48 x 198mm	3	Safety limiter	Graphic-LCD-display, with white LCD-backlight Inputs RTD Pt100 or double-thermocouple 2 alarm outputs Useable as Limiter and Exhaust gas Limiter Safety Limit alarm plus separate warning	DIN EN 14597 SIL2
STB 55 Limit Controller	DIN Rail Mounted 100 x 50 x 110mm	1	Safety limiter	Graphic-LCD-display, with white LCD-backlight Inputs RTD Pt100 or double-thermocouple 2 alarm outputs Useable as Limiter and Exhaust gas Limiter Safety Limit alarm plus separate warning	SIL2 EN 14597
West 4700+	1/4th DIN 96 x 96 x 110mm	3	High/low limit Alarm	5A Latching Limit Relay Easy to use HMI Configuration via PC Auto-hardware detect/set-up Modbus communications Jumperless configuration Process alarms	CE UL cUR UR FM CSA
West 6700+	1/16th DIN 48 x 48 x 110mm	3	High/low limit Alarm	5A Latching Limit Relay Easy to use HMI Configuration via PC Auto-hardware detect/set-up Modbus communications Jumperless configuration Process alarms	CE UL cUR UR FM CSA
West 8700+	1/8th DIN 96 x 48 x 110mm	3	High/low limit Alarm	5A Latching Limit Relay Easy to use HMI Configuration via PC Auto-hardware detect/set-up Modbus communications Jumperless configuration Process alarms	CE UL cUR UR FM CSA
PMA TB 40-1	1/8th DIN 96 x 48 x 118mm	3	Limiter	Applicable for heating and cooling applications For all types of thermocouples and resistance transducers BluePort Front interface and BlueControl Software Maintenance manager and error list Alarm reset via RESET-key Alarm reset via digital	IP65 CE EN 14597 cULus
PMA TB 45	DIN Rail Mounted 99 x 22.5 x 118mm	3	Limiter	Compact solution Clips onto top-hat DIN rail Plug-in screw terminals Dual-line LC display Convenient 3-key operation Fast 100 ms response	IP65 CE EN 14597 IP20 cULus
MAXVU Rail Limiter	DIN Rail Mounted 107 x 22.5x 123mm	2 or 3	High/low limit	DIN rail mounted Universal input Up to 3 outputs Digital input RS485 communications option Fast configuration Clear OLED display 22.5mm module width	CE UL cUL FM Approval
CAL 3300 Temperature Controller	1/32 DIN 24 x 48 x 107mm	2	High limit	1 x 4 digit LED display with 2 outputs LED Easy-to-use autotuning Simple menu-driven configuration Single ramp/soak (dwell) program IP66 protection CALgrafix datalogging software	IP66 CE UL CSA FM Approval
CAL 9300 Temperature Controller	1/16th DIN 48 x 48 x 107mm	2	High limit	PID Control Auto-Tune Quick Start Wizard Single Ramp/Soak (Dwell Programme) On/Off Control Derivative Approach Control (dAC) Remote Configuration via CALgrafix Datalogging Software	IP66 CE UL CSA FM Approval
CAL 9400 Temperature Controller	1/16th DIN 48 x 48 x 107mm	2	High limit	PID Control Auto-Tune Quick Start Wizard Single Ramp/Soak (Dwell Programme) On/Off Control Derivative Approach Control (dAC) Remote Configuration via CALgrafix Datalogging Software	IP66 CE UL CSA FM Approval
CAL 9500 Programmable Controller	1/16th DIN 48 x 48 x 107mm	3	High limit	2 x 4 Digital LED Programmer Function 31 Programs with up 126 Segments PID Control Auto-Tune Quick Start Wizard Remote Configuration via CALgrafix Datalogging Software	IP66 CE UL CSA FM Approval