Hanna Instruments HI 98280 - Manual (Page 59)

59
APPENDIX A - PROBE MAINTENANCE
HI9828 HI9828 HI9828 HI9828 HI9828 is supplied complete with a probe maintenance kit that includes
HI7042S
HI7042S HI7042S HI7042S HI7042S (electrolyte solution for DO sensor), 5 spare membranes with O-
rings for DO sensor, a small brush for cleaning EC and DO sensors, 5 O-rings
for sensor connectors and a syringe with grease to lubricate these O-rings.
General Maintenance
After use rinse the probe with tap water and dry it. The pH electrode bulb must be
kept moist. Dry the DO and EC sensors.
Maintenance of DO Sensor
For a top performance probe, it is recommended to replace the membrane every
2 months and the electrolyte monthly.
Proceed as follows:
• Unscrew the membrane by turning it counterclockwise.
• Rinse a spare membrane with some electrolyte while
shaking it gently. Refill with clean electrolyte.
• Gently tap the membrane over a surface to ensure that no air bubbles
remain trapped.
• With the sensor facing down, completely screw the cap clockwise. Some
electrolyte will overflow.
If any deposit scales the sensor, gently brush the sensor surface with the supplied
brush, while paying attention to not damage the plastic body.
Maintenance of pH Probe
• Remove the electrode protective cap. Do not be alarmed if any salt deposits are
present. This is normal with pH electrodes and they will disappear when rinsed
with water.
• • • • • Shake down the electrode as you would do with a clinical thermometer to
eliminate any air bubbles inside the glass bulb.
• • • • • If the bulb and/or junction are dry, soak the electrode in HI70300 HI70300 HI70300 HI70300 HI70300 storage
solution for at least one hour.
• • • • • To minimize clogging and ensure a quick response time, the glass bulb and the
junction should be kept always moist and not allowed to dry.
• • • • • Store the electrode with a few drops of HI70300 HI70300 HI70300 HI70300 HI70300 storage solution in the protective
cap. Tap water may also be used for a very short period (couple of days).
NEVER USE DISTILLED OR DEIONIZED WATER TO STORE THE NEVER USE DISTILLED OR DEIONIZED WATER TO STORE THE NEVER USE DISTILLED OR DEIONIZED WATER TO STORE THE NEVER USE DISTILLED OR DEIONIZED WATER TO STORE THE NEVER USE DISTILLED OR DEIONIZED WATER TO STORE THE
pH ELECTRODE.
pH ELECTRODE. pH ELECTRODE. pH ELECTRODE. pH ELECTRODE.