User manual

Monitor UPC-900

User Manual 18-1125-55 Edition AE

4 Maintenance

4.1 Periodic maintenance

Interval Action (see procedures below)

Every 3 months Check the monitor

Every 6 months Change the pH electrode

or more often if required Clean the UV flow cell

When required Clean the conductivity cell

Clean the pH electrode

4.2 Cleaning and checking the module

Wipe the monitor housing regularly with a damp cloth. Let the

monitor dry completely before use.

Lamp intensity

1 Select menu

Check and press OK.

2 Select menu

Check Lamp Intensity.

If:

R <300 mV for 254 nm

R <150 mV for 280 nm

R <150 mV for 214 nm,

replace the lamp according to Section 4.10 Changing the UV lamp,

or contact Amersham Pharmacia Biotech for lamp replacement.

Lamp run time

1 Select menu

Check and press OK.

2 Select menu

Check Lamp Run Time.

• The lifetime of a Hg lamp at 254 nm, in room temperature is

typically 7000 hours (in coldroom, typically 2000h).

• The lifetime of a Hg lamp at 280 nm, in room temperature is

typically 3500 hours.

• The lifetime of a Zn lamp is typically 2000 hours in room

temperature.

Check Lamp Run Time

Hg 2300h Zn 340h

Check Lamp Intensity

CAUTION! Only spare parts approved or supplied by Amersham

Biosciences may be used for maintaining and servicing the

module.

WARNING! Always disconnect the power supply before

attempting to replace any item on the module during

maintenance.