HT instruments HT950N - Manual (Page 6)

HT950N
EN - 6
 T2 Led
This Led shows that measured temperature by one of four probes is over T2 alarm
threshold set on HT950N and correspondent relay is activated. This means transformer
turn off (see Fig. 9).
 T.MAX Led
This Led is light on when you press T.MAX key and show the maximum temperature
recording by HT950N during all measured period. SET display shows the temperature
value and PARA display shows the column (C1=2U, C2=2V, C3=2W, C4=1F) of
correspondent maximum value.
 ERROR Led
This Led is light on if there is an error on setting threshold temperature values. In particular
for T2<T1 or UA<UF wrong set conditions.
 Principal Display
This display always show the real time temperature of the hot column.
 SET Display
This display shows the following temperatures:
 T2 temperature of transformer turn off during threshold setting.
 T1 temperature of pre-alarm during threshold setting.
 UA temperature of forced ventilation activation during threshold setting.
 UF temperature of forced ventilation disable during threshold setting.
 Maximum temperature recording by HT950N during measurements.
 Temperature of four columns C1, C2, C3, C4.
 PARA Display
This display show the control parameter (T2, T1, UF, UA) and the columns symbol (C1,
C2, C3, C4).
4.2. DESCRIPTION OF FUNCTION KEYS
 PARA key
This key can activate the setting of thresholds temperature. Refer to chapter 5.4 for any
details.
 ALT.T. key
Press this key the HT950N meter shows real temperatures on the four columns. PARA
display shows the columns names C1=2U, C2=2V, C3=2W, C4=1F and SET display
shows the correspondent temperature values. These displays light off in the following
three ways: press ENT. Key, press ALT.T. key when C4 column appair or automatically
after about 20 sec. From last operation.
 TEST key
Press this key HT950N execute a functionally test on verify the light on of all Led and
displays on the front panel.