Setting The Beginning And End Of The Measuring Range - Camille Bauer KINAX WT 710 Mode D'emploi

7.1 Connecting transmitters
There are 4 screw terminals (2.1) and 1 ground terminal (2.2)
in the casing (1). The screw terminals are suitable for wire
gauges up to 1.5 mm2 and are accessible when the cover
is removed.
ZERO SPAN
S1
(2.2)
Fig. 7. Housing (1) with the cover removed showing the screw
terminals (2.1), the ground terminal (2.2) and cable
glands (2).
Left: Instrument without electric isolation and with
DC power supply.
Right: Instrument with electric isolation and with
DC/AC power supply (power pack).
Take off the plastic cover.
Undo the gland nut and remove the pinch ring and seal from
the gland opening. Place these parts over the cable in the
correct order and pass the end of the cable through the gland
hole into the housing of the transmitter.
Strip the insulation from a suitable length of the leads and
connect them to the terminals (2.1) and ground terminal (2.2)
according to the respecive wiring diagram (Fig.8 or 9).
Then fi t the gland seal, pinch ring and nut. Tighten the gland
nut and replace the cover.
Bridge
–
R
ext
+
+ –
A and H
2-wire 3-wire
connection connection
(4...20 mA) (different
mA-signals)
A = Measuring output ...
... as 2-wire connection (4...20 mA, signal in
output/powering circuit)
... as 3 or 4-wire connection
(different mA-signals)
H = DC power supply H = 12...33 V
resp. H = 12...30 V with Ex version
R = External resistance
ext
Fig. 8. Connection diagrams for 2, 3 or 4-wire connection,
without electric isolation, DC power supply.
(1)
ZERO
SPAN
(2.2)
S1
(2.1)
(2)
+
+
R
R ext
ext
–
–
+
–
A H
A
4-wire
connection
(different
mA-signals)
4-wire connection (different mA-signals)
A = Measuring output
H = DC/AC power supply
R = External resistance
ext
Fig. 9. Connection diagram for 4-wire connection, with electric
isolation, DC/AC power supply.
8. Setting the beginning and end of the
measuring range
The coarse adjustment of the beginning of the measuring
range consists in aligning the zero of the measured device
with the external zero mark on the transmitter. The procedure
was described in Section 6 "Mounting". This Section concerns
the fi ne adjustment not only of the beginning of the range
(ZERO), but also of the end of the scale (SPAN).
Firstly, switch on the power supply to the transmitter.
Take off the cover from the housing.
Caution! The screw terminals (2.1) Fig. 7
are live.
The 230 V power supply is potentially
dangereous
Place themeasured device at its zero position, i.e. the po-
sition at which the KINAX WT 710 should produce 0 mA (3
or 4-wire connection), respectively 4 mA (2-wire connection)
at its output.
Should the output current differ by more than 2% from its initial
value, repeat the coarse zero setting procedure described
in Section 6 "Mounting".
Then adjust the "ZERO" potentiometer (Fig. 10 resp. Fig. 11)
using a watchmaker's screwdriver (2.3 mm diam.) so that the
+ –
desired output current fl ows.
H
Fig. 10. Housing (1) with the adjustments
"ZERO", "SPAN" and "S1".
+ – + –
+
R
ext
–
+ ~
– ~
A H
ZERO SPAN
S1
(1)
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