Controllers provide numerous ways to monitor the cooling system by a display or data output to a remote computer. The standard recirculating chiller controllers offer digital temperature display, calibration offset, low flow shut-off, auto-restart, °C/°F toggle, audible alarm, alarm mute, digital pressure sensing, low level, low/high temperature, pressure display, fault shut-off (toggle on/off), and relay contacts. The LCS cooling system controllers offer digital temperature display, °C/°F toggle, over-temperature indicator, calibration offset, low level indicator, low flow indicator, and analog output. If additional sensors and instrumentation are needed, the cost of the controller can rise significantly. In a custom cooling system, a non-standard controller can be one of the most expensive parts. Weighing the costs and benefits of every sensor and instrumentation requirement is highly recommended. For example, in deionization sensing, do you need to know the exact value or do you just need to be alarmed if it reaches a certain point? An alarm is less expensive than output of a precise digital reading. The same goes for flow, pressure, and temperature. For some applications, the additional sensing and instrumentation is well worth the additional cost. It can provide extra protection to the cooling system and to the equipment being cooled, which may be worth thousands or even millions of dollars.