Specifications

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MODEL 30 pH/DO SECTION 8.0
TROUBLESHOOTING
8.5 TROUBLESHOOTING WHEN NO ERROR MESSAGE IS SHOWING — GENERAL
8.5.1 Current Output Too Low.
Load resistance is too high. Maximum load is 600 Ω.
8.5.2 Alarm Relays Do Not Work
A. Verify the relays are properly wired.
B. Replace power supply PCB.
8.5.3 Display is Unreadable.
While holding down the MENU key, press " or ' until the display has the correct contrast.
Problem See Section
Current output is too low 8.5.1
Alarm relays do not operate when setpoint is exceeded 8.5.2
Display is unreadable — too faint or all pixels dark 8.5.3