Checking The Display; Service; Maintenance; Overvoltage Protection - Messko ZT-F2.1 Instrucciones De Operación

8

Checking the display

9

Service

10

Maintenance

If necessary, round off the calculated value to a whole number
since the value to be set from 4 K to 50 K can only be set in
1-K increments.
The setting can also be determined graphically with the follow-
ing diagram in figure 4 or figure 5.
If the intersection point of CT nominal current and target
temperature gradient is located between two of the pictured
curves, the required curve must be interpolated or the above
mentioned formula must be used to determine the value to
be set.
8 Checking the display
Allow the dial-type thermometer to warm up for 30 minutes
and then compare the readings on the dial and the electronic
display. The readings should be within the tolerance ranges of
both devices.
9 Service
Too high gradient display: Check if only oil is actually present
in the thermometer pocket.
Too low gradient display on mechanical thermometer: Check
if the mechanical temperature probe is inserted to the stop.
Check alternatively, whether there is enough oil inserted in the
thermometer pocket.
Deviations by special operating conditions can be corrected if
necessary by changing the dip switches.
If the above instructions are not sufficient, please contact our
factory.
10 Maintenance
The ZT-F2.1 transformer is maintenance-free.

11 Overvoltage protection

All inputs and outputs are equipped with a safety circuit to
divert fault currents which can be created during lightning
strikes, switching events, or similar.
When a high voltage test > 300 V AC occurs between housing
and inputs or outputs, fault currents can be diverted which are
greater than the maximum permissible fault current.
14
11 Overvoltage protection
12

Technical Data

12 Technical data

Dimensions:

Materials:
Housing/terminal box:
Thread joint:
Installation:
Protection mode:
Flange:
Weight:
Terminal box:
Cable glands:
Connection diagram:
Connection terminals:
Ventilation:
Operating and ambient conditions:
CT nominal current:
Overload stability:
Gradient adjustment:
Measuring range thermometer: Depends on thermometer used
Ambient temperature:
Location:
Heating:
Power CT:
Mounting orientation:
Rated insulation voltage:
Analog output signal:
Current output 4...20 mA:
Power supply:
Load:
Refer to appendix, chap. 13.1
Aluminum alloy, die-casting,
RAL 7033, RAL 7038
Double thread G1B,
brass, blank
Thermometer pocket
DIN EN 50216-4 type A1
or similar
IP 56 acc. DIN EN 60 529
Teflon
1.7 kg
1x M16 x 1.5 WADI;
2 x M25 x 1.5 WADI
Refer to chap. 6
4 mm single core
2
Via pressure compensation
element
2 A from current transformer
Continuously max. 3 A
(corresponds to 1.5 x
CT nominal current);
12 A for 30 sec.
Via dip-switch (refer to chap. 7
and appendix chap. 13.2)
-50... +85° C
Indoors and outdoors,
tropical proof
Integrated in immersion tube
. 4.5 Ω
P [VA] = I
2
CT
Any
300 V AC, 50Hz
Up to 2x for Pt100 / Pt1000
or up to 2x 4...20 mA,
others on request
min. 10 V DC ... max. 30 V DC
max. 750 Ω for 24 V DC
BA2526030-07