The H34-540 Series is 1/16 DIN or 1/4 DIN temperature controller with auto tuning PID control capabilities. One of four user programmable set points may be selected. For PID control in the form of time proportional relay on/off output, time proportional voltage pulse, or 4-20 mAmp signal control. Its universal input accepts 23 input varieties, including thermocouple, RTD, and voltage inputs can be easily configured for a 4-20 mAmp input. The relays may be programmed as alarms with 20 different high, low, and deviation alarm types which can include failsafe operation. Digital input options add the ability of external contacts to operate the controller. With RS-485 serial communication options include protocols for master/slave set point control, modbus ASCII and RTU.

The H34-550 Series (not shown) is 1/16 DIN or 1/4 DIN ramp and soak controller with auto-tuning PID control capabilities. Two programs store 15 segments each for precision set point control. At the completion of a program, the controller can hold a set point, stop the outputs, or loop the completion of a program. Thus, enabling one 30 segment program to be used. Its universal input accepts 23 inputs varieties, including thermocouple, RTD, and voltage inputs can easily be configured for a 4-20 mAmp input. The relays may be programmed as alarms with 20 different high, low, and deviation alarm types which include failsafe operation. Digital input options add the ability of external contacts to operate the controller and digital output options are available. With RS-485 serial communication options include protocols for master/slave set point control, modbus ASCII and RTU.