6 MAINTENANCE
9070
6.1-3 NITRIC ACID CLEANING SOLUTION
Note:
Waltron L.L.C. offers Nitric Acid in a 2 ounce size part number H1234-556
Use this for refurbishing the sensor. This solution will clean the platinum
anode and silver cathode. The cleaning solution is a 25% nitric acid
aqueous solution.
[
Warning
: Be sure to add the acid solution to the water. Do not add
water to the acid solution.
Prepare the cleaning solution as follows:
Add 25ml of reagent grade Nitric Acid to 75ml of high purity water to
yield a 100ml total final volume. Store in a plastic container.
[
Warning:
Prepare the nitric acid solution under a fume hood and take the
appropriate precautions when handling concentrated acids.
6.1-4 HYDRAZINE SENSOR RECHARGE GEL
This solution, required for refilling hydrazine sensor at extended intervals, is
available in a syringe from Waltron L.L.C. (
Part number H3500-315A
).
Store this gel in a refrigerated area until use.
6.2 SCHEDULED
SERVICING
The following procedures are guides to the monitor’s maintenance
requirements. The procedure chosen depends on the particular installation
and sample conditions.
6.2-1 BI-
WEEKLY
9
Monitor the condition of the hydrazine filling gel and the level of
the buffer reservoir.
9
Perform calibration on standards.
26
