HT instruments HT950N - Manual (Page 11)

HT950N
EN - 11
5.2.4. T1 output alarm circuit
The output relay connection of T1 pre-alarm circuit is presented on following Fig. 7:
Fig. 7: T1 relay on no alarm conditions (normally activated)
T1 relay operate a commutation in the following cases:

When HT950N measures a temperature over T1 threshold.

Whit Pt100 probes open or shorted.

Power supply switch off on HT950N.
5.2.5. T2 output alarm circuit
The output relay connection of T2 alarm circuit is presented on following Fig. 8:
Fig. 8: T2 relay on no alarm conditions (normally disabled)
T1 relay operates a commutation when HT950N measures a temperature over T2
threshold, after a delay time of 50 seconds.
5.3. MESSAGES ON POWER-ON
r_ N
This message appear for about 2 seconds on principal display to
indicate the realise of internal firmware of meter. N show the
version number.
Ht 950
This message is fixed on PARA and SET display and show the
model of meter. Press ALT.T. or T.MAX key followed by ENT. key
to disappear message.