Yokogawa Wireless Temperature Transmitter YTA510 - Manual (Page 11)

<2. Notes on Handling>
2-3
IM 01C50E01-01EN
2.6 Insulation Resistance Test
and Withstand Voltage Test
(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 VDC or lower, and the voltage for
the withstand voltage test must be 500 VAC
(50Hz ~ 60Hz) or lower. Failure to heed these
guidelines may cause faulty operation.
(3) Follow the steps below to perform the test.

Insulation resistance test procedure
1) Remove the battery pack. See subsection
8.4.4 for details on how to remove it.
2) Lay wiring across sensor terminals in the
terminal box.
3) Turn OFF the insulation tester. Then connect
the insulation tester plus (+) lead wire to the
shorted battery connection terminals and the
minus (-) lead wire to the grounding terminal.
4) Turn ON the insulation tester power
and measure the insulation resistance.
The voltage should be applied as briefly
as possible to verify that the insulation
resistance is at least 100 MΩ.
5) After completing the test and being very
careful not to touch exposed conductors
disconnect the insulation tester and connect
a 100 kΩ resistor between the grounding
terminal and the short-circuiting battery
connection terminals. Leave this resistor
connected at least one second to discharge
any static potential. Do not touch the
terminals while it is discharging.
NOTE
When storing the instrument with a battery pack,
it is recommended to put the instrument in Deep
Sleep mode to conserve the batteries. For details
on how to switch to Deep Sleep mode, refer to
subsection 7.3.14 "Switching to Deep the Sleep
Mode".
 Withstand voltage test procedure
1) Remove the battery pack. See subsection
8.4.4 for details on how to remove it.
2) Lay wiring across sensor terminals in the
terminal box.
3) Turn OFF the dielectric strength tester.
Then connect the tester between the
shorted battery connection terminals and
the grounding terminal. Be sure to connect
the grounding lead of the dielectric strength
tester to the ground terminal.
4) Set the current limit on the dielectric strength
tester to 10 mA, then turn ON the power and
gradually increase the test voltage from ‘0’ to
the specified voltage.
5) When the specified voltage is reached, hold
it for one minute.
6) After completing this test, slowly decrease
the voltage to avoid any voltage surges.
NOTE
When storing the instrument with a battery pack,
it is recommended to put the instrument in Deep
Sleep mode to conserve the batteries. For details
on how to switch to Deep Sleep mode, refer to
subsection 7.3.14 “Switching to Deep the Sleep
Mode”.
2.7 Installation of an Explosion-
Protected Instrument
If a customer makes a repair or modification to an
intrinsically safe instrument and the instrument is
not restored to its original condition, its intrinsically
safe construction may be compromised and the
instrument may be hazardous to operate. Please
contact Yokogawa before making any repair or
modification to an instrument.
CAUTION
This instrument has been tested and certified
as being intrinsically safe. Please note that
severe restrictions apply to this instrument’s
construction, installation, external wiring,
Maintenance and repair. A failure to abide by
these restrictions could make the instrument a
hazard to operate.