The L641 is a range of thermostats designed for surface mounting the piping associated with the heating system to provide both Hi and Low temperature protection. The low limit version may be used with the T4360A Frost thermostat to offer complete system protection against freezing.
Suitable to pipes from 15mm to 28mm.
Differental 10C (fixed)
Low Limit (10C to 40C) - L641B1004
High Limit (50C to 95C) - L641B1012