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The thermostat test is carried out by varying constantly the heater temperature. In order to follow this procedure, use SP-
2 and Ramp functions, verify the right switching of the thermostat contact on the Test LED and contemporaneously
check the temperature value on the display.
The difference between the set value supplied and the temperature, highlights the
▲
t
of the thermostat.
To verify the right functioning of the thermostat proceed as it follows:
•
Insert the sensing elements of the thermostat into the relevant hole of the thermal equalizing block.
•
Electrically connect the output connecting terminals of the thermostat with the two terminals located on the upper part
of the instrument.
•
Adjust the set-point of the thermostat to the test value (e.g.: 100 °C - see diagram).
•
Energize
CL551
.
•
Wait for the control routine to be done and adjust the SP to 95° C using the
<
▲
>
key.
•
Press the
<E>
key to confirm the value.
Within a minute the heater temperature will settle to 95°C.
•
When the temperature is settled, press the
<F>
key. The display will show:
T : 95.0 °C
SP2: 40.0 °C
•
Press the
<
▲
>
key to set the SP-2: value to 105.0:
T : 95.0 °C
SP2: 105.0 °C
•
Press the
<E>
key to confirm.
•
Then press the
<F>
key until you obtain:
T : 95.0 °C
grad: 0.4 °C/m
•
Press the
<
▲
>
or
<
▼
>
key to determine a speed variation of the heater set-point temperature similar to the
acknowledgement time of the thermostat (e.g.: 1 ° / min.):
T : 95.0 °C
grad: 1.0 °C/m
•
Press the
<E>
key to confirm.
•
Press the
<F>
key to obtain:
T : 95.0 °C
ramp: OFF
•
Press
<
▲
>
to obtain:
T : 95.0 °C
ramp: ON
•
Press the
<E>
key to confirm.
From now on the heater temperature will vary from 95.0 to 105.0 °C with increments of 1 °C per minute.
The operator will verify the temperature value on the display when the Test light is OFF.
•
Press the <
E>
key
5 times and the display will show up the following message:
T : 95.0 °C
SW/ON : 94.8 °C
SW/ON :94.8 is the value in °C to close the contact of the thermostat
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