IM 01C50B01-01E
2-2
2. NOTES ON HANDLING
(3) Impact and Vibration
It is recommended that the instrument be installed in a
location that is subject to a minimum amount of impact
and vibration.
2.5 Use of a Transceiver
Although the temperature transmitter is designed to
resist influence from high frequency noise; use of a
transceiver in the vicinity of installation may cause
problems. Installing the transmitter in an area free from
high frequency noise (RFI) is recommended.
2.6 Insulation Resistance Test
and Withstand Voltage Test
CAUTION
(1) Overvoltage of the test voltage that is so
small that it does not cause an dielectric
breakdown may in fact deteriorate insulation
and lower the safety performance; to prevent
this it is recommended that the amount of
testing be kept to a minimum.
(2) The voltage for the insulation resistance test
must be 500 VAC or lower, and the voltage
for the withstand voltage test must be 500
VAC or lower. Failure to heed these guide-
lines may cause faulty operation.
(3) Where a built-in arrester is provided (suffix
code: /A), the voltage for the insulation
resistance test must be 100 VDC or lower,
and the voltage for the withstand voltage test
must be 100 VAC or lower. Failure to heed
these guidelines may cause faulty operation.
Follow the steps below to perform the test, the wiring
of the transmission line must be removed before
initiating testing.
2.6.1 Insulation resistance test procedure
Testing between the output terminal and
input terminal
1. Lay transition wiring between the + terminal, the -
terminal, and the check terminal of the terminal box.
2. Lay wiring across terminals 1, 2, 3, and 4 of the
terminal box.
3. Connect the insulation resistance meter (with the
power turned OFF) between the transition wiring of
Steps 1 and 2 above. The polarity of the input
terminals must be positive and that of the output
terminals must be negative.
4. Turn the power of the insulation resistance meter
ON and measure the insulation resistance. The
duration of the applied voltage must be the period
during which 100M⍀ or more is confirmed (or
20M⍀ if the unit is equipped with a built-in
arrester).
5. Upon completion of the test, remove the insulation
resistance meter, connect a 100K⍀ resistor between
the transition wiring, and allow the electricity to
discharge. Do not touch the terminal with your bare
hands while the electricity is discharging for more
than 1 second.
Testing between the output terminal and
grounding terminal
1. Lay transition wiring between the + terminal, the -
terminal, and the check terminal of the terminal box,
then connect an insulation resistance meter (with the
power turned OFF) between the transition wiring
and the grounding terminal. The polarity of the
transition wiring must be positive and that of the
grounding terminal must be negative.
2. Turn the power of the insulation resistance meter
ON and measure the insulation resistance. The
duration of the applied voltage must be the period
during which 100M⍀ or more is confirmed (or
20M⍀ if the unit is equipped with a built-in
arrester).
3. Upon completion of the test, remove the insulation
resistance meter, connect a 100K⍀ resistor between
the transition wiring and the grounding terminal, and
allow the electricity to discharge. Do not touch the
terminal with your bare hands while the electricity is
discharging for more than 1 second.
Testing between the input terminal and
grounding terminal
1. Lay transition wiring between terminals 1, 2, 3, 4
and 5 of the terminal box, and connect the insulation
resistor (with the power turned OFF) between the
transition wiring and the grounding terminal. The
polarity of the transition wiring must be positive and
that of the grounding terminal must be negative.
2. Turn the power of the insulation resistance meter
ON and measure the insulation resistance. The
duration of the applied voltage must be the period
during which 100M⍀ or more is confirmed (or
20M⍀ if the unit is equipped with a built-in
arrester).
3. Upon completion of the test, remove the insulation
resistance meter, connect a 100K⍀ resistor between
the transition wiring and the grounding terminal, and
allow the electricity to discharge. Do not touch the
terminal with your bare hands while the electricity is
discharging for more than 1 second.
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