The unit should be protected against
heat radiation!
NIVOTRACK MT_-2 series is offered
with a variety of process connections.
The process connection on the tank and
its opening should be arranged so that
the float can be inserted. Should it not
be possible, the float should be
removed from the sensor shaft. After
inserting the shaft, the float should be
pulled onto the guide tube inside the
vessel. The word UP etched on the float
is to ensure mounting the float in correct
position. To complete procedure, the
retaining pin should be inserted into its
hole and legs bent.
Note:
before installation it is advisable
to perform a preliminary operational
check similar to the procedure
described in the Calibration section.
UP
Ln
év
l.
liquid
Suggested opening
greater than 54 mm
∅
Shaft
4. WIRING
After unscrewing and removing the housing cover from the unit the cable
should be pulled through the conduit opening. The unit contains CMOS
components, which can be damaged by static electricity. Therefore the
shielding of the cable should be connected to the ground screw first. After the
shield is grounded, the (+) wire and (–) wire of the terminal J1 should be
connected. Is the shield also grounded at the power supply an equaliser cable
should be applied between the two ground screws.
.
+
Terminal J1
2
1
5. SETUP PROCEDURE, CALIBRATION
After power up the unit is fully operational.
Factory Setting
Operation mode:
in accordance with the order (normal or reverse).
Range:
maximum or in accordance with the order.
Damping:
1s
Operating mode selection (Jumper J1)
Direction of the output change assigned to the level change can be the same
or reversed.
Note
: Jumper J1 is factory set. It must not be changed in the
field!
Normal operation
Reverse operation
JP1 position
2
1
5
6
2
1
5
6
Low level
4 mA
20 mA
High level
20 mA
4 mA
Local current meter (Jumper JP2).
Jumper JP2 allows for the connection of an auxiliary current meter:
-
Move Jumper JP2 from pins 1-2 to pins 2-3.
3
1
2
3
1
2
The (yellow) LED will illuminate indicating possibility of the measurement.
Connect the meter J4 (positive) and J5 (negative), and the LED will go
out.
-
Move the Jumper JP2 back to pins 1-2 after measuring the current.
Calibration
Normal operating mode
Move the float to the desired top position for the 20 mA
output. Adjust SPAN: clockwise to increase and counter-clockwise to decrease
the output to 20 mA ±0.01 mA
.
Move the float to the desired bottom position for the 4 mA output. Adjust
ZERO: clockwise to increase and counter-clockwise to decrease the output to
4 mA ±0.01 mA.
Repeat steps 1 and 2 several times until the outputs at the set
points remain ±0.01 mA.
Reverse operating mode:
It is the same procedure as with the normal
operation. The only difference is that the 4 mA in the top position should be set
by the potentiometer SPAN and that the 20 mA in the bottom position should
be set by the potentiometer ZERO.
Adjustment of damping (Jumper JP3)
Jumper JP3 allows for the adjustment of the damping time. This jumper is
factory set between pins 1
2 for 1 second.
Damping
1s
5s
JP3 position
1s
5s
1s
5s
5S
1S
JP2
J5 (-)
1
2
5
6
3 2 1
LED
5.1. P
OWER
S
UPPLY FOR
E
X
P
ROOF
U
NITS
The unit can be connected to a current loop with duly certified EEx ia IIB power
supply and with technical data according to the Technical Data.
Ex
Ex
+
max
U = 28.4 V DC
I = 99 mA
max
P = 0.67 W
max
C = 150 nF
i
L = 1.2 mH
i
Galvanical
isolation
230V AC
6. MAINTENANCCE AND REPAIR
The unit does not require routine maintenance, however the shaft may need
occasional cleaning to remove surface deposits. Repairs will be performed at
the manufacturer premises.
Units returned for repair should be cleaned or
desinfected by the customer.
7. STORAGE CONDITIONS
Ambient temperature: -30°C … +60 °C
Relative humidity: max. 98%
8. WARRANTY
Nivelco provide a warranty for the period of 2 (two) years.
Repairs under warranty are performed at the Manufacturer's premises; costs of
dismantling, reinstalling or shipping are borne by the Customer.
Claims for guarantee are not valid in respect of failures due to abnormal usage,
breakage, disaster, or incompetent installation or usage.
mtc2092a0601h
2002.01.02
Technical specification may be changed without notice.
