37
Section 7
Maintenance
DANGER
Only qualified personnel should conduct the maintenance tasks described in this
section of the manual.
7.1 Scheduled Maintenance
7.1.1
Refilling the pH Conditioner
Replenish the reagent every 3 months, or more frequently if necessary.
CAUTION
To familiarize yourself with
handling precautions, dangers,
and emergency procedures,
always review the Material Safety
Data Sheets prior to handling
containers, reservoirs, and
delivery systems that contain
chemical reagents and standards.
Protective eye wear is always
recommended when contact with
chemicals is possible.
The standard conditioner cap fits on Merck bottles. An optional cap is available
that adapts wide-mouth Nalgene bottles to the pH conditioner/bottle cap
(Cat. No. 09073=C=0350. These caps avoid the transfer to the original bottle DIPA
available from Hach. Other adapters are available on request.
Replenish the pH conditioner every 1–3 months, depending on the particular
chemical chosen. A minimum pH of 10.2 should be maintained when measured at
the drain. To verify pH for
≥
10.2 use DIPA supplied by Hach (Cat. No. 28344-53).
Monoethyamine, diethylamine and ammonia can also be used.
7.1.2 Replacing the Tubing
Replace the tubing annually. Use only Kynar
®
or Teflon
®
tubing
(Cat. No. 151575,00006).
7.1.3 Replacing the In-line Filter
Replace the In-line Filter (Cat. No. 363877,06000) every 1 to 6 months, depending
on sample conditions.
7.2 Unscheduled Maintenance
7.2.1
Replacing the Fuse
DANGER
Remove power from the
instrument when removing or
installing a fuse.
The T, 2 A, 250 V fuse (Cat. No. 295=100=203) used in this instrument is used for
both 115 V and 230 V operation.
Replace as follows:
DANGER
For continued protection against
fire hazard, replace the fuse only
with a fuse of the same type and
rating.
1.
Make sure there is no power supplied to the instrument.
2.
Remove the front cover and the shielding plate inside the instrument.
3.
Locate the fuse holder. Using a flat-head screwdriver, gently push in the fuse
holder and rotate it to the left.
4.
Gently pull the fuse holder out of the instrument.
5.
Replace the fuse with an identical fuse.
6.
Insert the fuse holder into its compartment. With the flat-head screwdriver,
gently push it in and rotate it to the right.
7.
Replace the shielding plate and the front cover.
