Yokogawa YTA320 - Manual (Page 9)

<2. Notes on Handling>
2-3
IM 01C50B01-01E
or more is confirmed (or 20MΩ if the unit is
equipped with a built-in arrester).
3. Upon completion of the test, remove the
insulation resistance meter, connect a 100KΩ
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.
2.6.2 Withstand voltage test procedure
 Testing between the output terminal and
the input terminal
1. Lay transition wiring between the + terminal,
the – terminal, and the check terminal of the
terminal box.
2. Lay transition wiring between terminals 1, 2, 3,
4 and 5 of the terminal box.
3. Connect the withstand voltage tester (with
the power turned OFF) between the transition
wiring shown in Steps 1 and 2 above.
4. After setting the current limit value of the
withstand voltage tester to 10mA, turn
the power ON, and carefully increase the
impressed voltage from 0V to the specified
value.
5. The voltage at the specified value must remain
for a duration of one minute.
6. Upon completion of the test, carefully reduce
the voltage so that no voltage surge occurs.
 Testing between the output terminal and
the grounding terminal
1. Lay the transition wiring between the + terminal,
the - terminal and the check terminal of the
terminal box, and connect the withstand voltage
tester (with the power turned OFF) between the
transition wiring and the grounding terminal.
Connect the grounding side of the withstand
voltage tester to the grounding terminal.
2. After setting the current limit value of the
withstand voltage tester to 10mA, turn the
power ON, and gradually increase the
impressed voltage from 0V to the specified
value.
3. The voltage at the specified value must remain
for a duration of one minute.
4. Upon completion of the test, carefully reduce
the voltage so that no voltage surge occurs.
 Testing between the input terminal and
the grounding terminal
1. Lay the transition wiring across terminals 1, 2,
3, 4, and 5 of the terminal box and connect the
withstand voltage tester (with the power turned
OFF) between the transition wiring and the
grounding terminal. Connect the grounding side
of the withstand voltage tester to the grounding
terminal.
2. After setting the current limit value of the
withstand voltage tester to 10mA, turn the
power ON, and gradually increase the
impressed voltage from 0V to the specified
value.
3. The voltage at the specified value must remain
for a duration of one minute.
4. Upon completion of the test, carefully reduce
the voltage so that no voltage surge occurs.
2.7 Installation of Explosion
Protected Type Transmitters
In this section, further requirements and differences
and for explosionproof type instrument are
described. For explosionproof type instrument,
the description in this chapter is prior to other
description in this users manual.
CAUTION
To preserve the safety of explosionproof
equipment requires great care during mounting,
wiring, and piping. Safety requirements also
place restrictions on maintenance and repair
activities. Please read the following sections very
carefully.
2.7.1 CSA Certification
Model YTA110/CU1, YTA310/CU1 and YTA320/
CU1 temperature transmitters can be selected the
type of protection (CSA Intrinsically Safe, Non-
incendive, or Explosionproof) for use in hazardous
locations.
Note 1. For the installation of this transmitter, once
a particular type of protection is selected, any
other type of protection cannot be used. The
installation must be in accordance with the
description about the type of protection in this
instruction manual.
Note 2. In order to avoid confusion, unnecessary
marking is crossed out on the label other
than the selected type of protection when the
transmitter is installed.