HF scientific Micro200BW Turbidimeter - 0-100 NTU - Manual (Page 22)

MICRO 200 BW 0-10 & 0-100 NTU (05/05)
Rev. 3.4
2.4.2 Analyzer Power
The power cord (120V) provided is 6 feet (1.83 meters)
long. The analyzer power requirement is 40 VA at either
120 VAC or 240 VAC. The voltage setting of the
analyzer can be determined by removing the access
cover and looking at the fuse cartridge, just to the left of
the power cord receptacle. The voltage printed next to
the two triangles that point toward each other indicate
the selected voltage. To change the input voltage first
remove the power cord. The fuse cartridge can be
removed by prying upwards using a flat blade screw-
driver in the slot provided. Pull the cartridge out, invert
and then reinsert. Refer to figure 7 on page 10. To
replace a blown fuse remove the fuse cartridge as in
figure 7 on page 10. Replace only the fuse for your
selected voltage. The triangle on the fuse cartridge
points to the fuse for the voltage. The correct fuse ratings
are 5 x 20 mm 1A fast acting for 120 VAC and 5 x 20 mm
½A fast acting for 240 VAC.
A power switch is located to the right of the power cord.
WARNING: If power connection is to be hard wired,
place each analyzer on a separate circuit
breaker or switch to allow for service.
Observe all local wiring codes.
2.4.3 D/A Outputs - Voltage & Current
The full scale range of the recorder outputs, both voltage
and 4 - 20 mA, is determined by the upper and
lower limits selected by the user in the display param-
eters menu. Please note that either 4 - 20 mA OR voltage
may be selected in the DISPLAY PARAMETERS menu,
but not both.
2.4.4 Recorder - Voltage
Recorder output voltage is selected at the terminal block
labeled ANALOG VOLTAGE (J6). Only one of
these voltages is to be selected at any time.
Recorder load for each voltage:
Terminal 1 0 - 10V 50000 ohms or greater
Terminal 2 0 - 1V 5000 ohms or greater
Terminal 3 0 - 100mV 500 ohms or greater
Terminal 4 Common
Twisted pair shielded cable, 22 AWG - 14 AWG, is
recommended. Tie the shield to the ground terminal the
recorder end (Do not connect shield to MICRO 200
BW analyzer).
2.4.5 Recorder - Current
A 4-20 mA current output is available. The connections
are made at the terminal block labeled Analog 4-20 mA
(J5). Use twisted pair shielded cable, 22 AWG - 14
AWG, with the shield tied to earth ground at the recorder
end. (Do not tie shield to ground at the analyzer). The
recorder load may be rated from 0-1000 ohms maxi-
mum. Terminal #1 is positive, terminal #2 is negative.
2.4.6 4 - 20 mA Isolation
Isolation of the 4 - 20 mA recorder output may be
achieved by removing the jumper at J13. This procedure
requires removal of the rear cover assembly. Refer to
figure 8 to remove the rear cover and figure 9 for
location of jumper.
Figure 8
Analyzer Rear Cover Removal
Page 10
Figure 7
Changing Analyzer Voltage/Fuse
220-240V
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USE ONLY WITH 250V FUSES / EMPLOYER UNIQUEMENT AVEC DES FUSIBLES DE 250V
110-120V
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