<PG400 Pulse Generator for Clean Unit>
16
IM 19C01B05-01EN
2nd Edition : Jul. 06, 2021-00
Check sometimes whether POWER LED, OUTPUT LED is lit. If they are not lit on, refer to the
following procedure.
● POWER LED is off.
PG400 is protected by fuse which provides overcurrent protection of inner circuit.
POWER LED is off because the fuse may be blown out. To replace the fuse with a new
one(A1109EF), shut off the power supply first then remove the protect cover. If the POWER
LED stays off even after the fuse is replaced, contact Yokogawa service center. For
replacement, use the fuse with a rating specified on page 7 the table “Option parts”.
WARNING
Fuse replacement should be performed only by a qualified service personnel.
● OUTPUT LED is off.
If OUTPUT LED is off, even when POWER LED is lit on and the output switch is on, contact
Yokogawa service.
n
No cleaning effect by ultrasonic cleaning
Ultrasonic cleaning is considered to be working effectively, when no visible contamination is
found on the surface of glass electrode/junction of pH sensors, or the window of ultrasonic
oscillator of turbidity detectors. However, if you found no or little effect even after the cleaning-
power adjustment, the possible reasons would be as follows.
● Ultrasonic oscillator error
Check whether there is a hole made by a surface corrosion of the oscillator. If there is the
corrosion and fluid enters the instrument, other parts may need to be replaced.
● Oscillator cable error
Shut off the power supply then check whether there is wire disconnection or short circuit.
NOTE
Adhesive substances in sample may affect the junction of the ultrasonic oscillator. The
contamination of the wetted surface, especially on the surface of the vibrating part should be
removed. The contamination may impair the cleaning effect. If the sample contains adhesive
contaminants, keep the surface from the fixation of contaminations when the operation is
paused. Refer to each detector’s user’s manual for cleaning those contaminants including
chemicals or substances which ultrasonic cleaning may not be effective to.
Revision Record
Jul. 2021/2nd Edition
Addition IM.
Feb. 2021/1st Edition
Newly published
Yokogawa Electric Corporation
2-9-32 Nakacho, Musashino-shi, Tokyo 180-8750, JAPAN
http://www.yokogawa.com/
