Hach-Lange 2100P iso - Portable Turbidimeter Instrument - Manual (Page 29)

Page 29
4650098 maintenance.fm MAINTENANCE
Section 4 MAINTENANCE
4.1 Lamp Replacement
The procedure below explains lamp installation and electrical connections. Use a
small screwdriver to remove and install the lamp leads in the terminal block. The
instrument requires calibration after lamp replacement.
1. Orient the instrument so it is upside down and the top faces away from you.
Remove the battery cover and at least one battery.
2. Remove the lamp assembly by grasping the tab on the left side of the assembly
and remove the old lamp leads.
3. Insert the new lamp at the same way.
4. Replace the batteries and battery cover.
5. Insert the 800 FNU formazin standard into the sample cell. Press and hold
READ
.
Then press
I/O
. Release the
READ
key after the software version number disappears
from the display.
6. Adjust the scattered light amplifier output by inserting a small flat-blade
screwdriver into the trimpot hole (located on bottom). Adjust the display to read
2.5 ± 0.3 volts.
7. Press
I/O
to exit gain adjust mode.
8. Perform a formazin calibration according to Calibrating the Turbidimeter on
page 21.