Yokogawa 212 Heat Calculator - Manual (Page 28)

3.5 OFFSET FUNCTIONS
The offset function is designed for air conditioning systems with a very low
∆
t.
Often, in these systems, a bypass valve is installed to enable any differences in
the feed and return temperature to be zeroed out.
To compensate for any offset in the temperature sensors the Model 212 must be
put into the Set-up Program mode. The bypass valve "A" is then opened and the
valves "B" and "C" are closed.
With offset selected, the user then enters YES to zero the offset between the feed
and return lines. The measured offset will then be displayed on the Model 212,
the value of which will be stored when the Set-up Mode is exited.
The system is then returned to normal by closing valve "A" and opening valves
"B" and "C".
26 Operation