HT instruments HT950N - Manual (Page 4)

HT950N
EN - 4
2. GENERAL DESCRIPTION
Dear Customer, we thank you for your patronage. The HT950N meter you have just
purchased will grant you accurate and reliable measurements, on protection of MV
transformer, provided that it is used according to the present manual’s instructions.
The HT950N model it was been designed with high quality electrical components and,
during test verify, it’s subject to BURN-IN test to eliminate any internal bugs due to rapid
death rate of components.
The HT950N meter presents the following features:
 1 up to 4 input temperature signals, selectable by key, from same number of thermo
sensitivity elements Pt100 DIN type with three wires.
 Measurement range from 0° to 200°C.
 Automatic compensation of 3-wire cable resistance.
 Setting of two alarm thresholds temperature T2 and T1, with T2>T1, programmable on
all measurement range, with activation of the same number of output relays.
 Setting of two alarm thresholds temperature UA and UF, with UF<UA with activation of
an output relay. These thresholds can be used to activate a possible forced ventilation
system or a parallel device.
3. PREPARATION TO USE
3.1. INITIAL
The instrument has been checked from every point of view before shipment. Every care
has been taken to make sure that the instrument reaches you in perfect conditions.
However, it’s advisable to make a rapid check in order to detect eventual damages, which
may have occurred in transit. Should this be the case, enter immediately the usual claims
with the carrier. Make sure that all the accessories listed in paragraph 7.3.1are contained
in the package. In case of discrepancies contact the dealer.
In case of returning of the tester, please keep to the instructions given in chapter 8.
3.2. POWER
SUPPLY
The instrument can be supplied with a voltage between 24 and 240 V AC (50/60 Hz) or DC
voltage.
3.3. CALIBRATION
The instrument complies with the technical features listed in this manual.
3.4. STORAGE
In order to guarantee the accuracy of the measurements, after a period of storage in
extreme environmental condition, wait for the necessary time so that the instrument
returns to normal measuring conditions (see paragraph 7.2.1).