In-Situ TROLL 9500 Operators Manual - Manual (Page 71)

64 TROLL 9500 Operator’s Manual 0095110 rev. 007 01/09
SN32072
Files:
File Name
SN32072 2006-04-17 171530 TURB.html
SN32072 2006-06-18 102309 DO.html
SN32072 2006-08-14 134200 QuickCal.html
SN32072 2006-11-25 121530 PH.html
SN32072 2007-01-11 154322 Cond.html
Folders:
Folder
SN32072
SN45025
Example of a calibration report index
Click a folder to see its listings
Click a tile to open it
MP TROLL 9500
serial number
Cal Date Cal Time
(hhmmss)
Parameter
The calibration reports are accessible from the Tools Menu and the
Show Calibration Report button
on the toolbar. They may also
be accessed like other files through Windows Explorer (desktop PC)
or File Explorer (PDA); they are not displayed in the Data Folder. They
may be viewed or printed to provide a complete calibration history.
TIP: Here’s how to find the calibration report indexes:
Desktop or laptop PC—Calibration Reports subfolder in the folder
where Win-Situ 4 is installed
PDA—Calibration Reports subfolder in the folder where Pocket-Situ
4 is installed
HOW OFTEN TO CALIBRATE
No sensor will remain in calibration forever. The calibration frequency
is almost completely determined by the chemical properties of the
mUID
When a sensor or instrument is new, we recommend checking the
readings often (say, once a day) to get an idea of the stability of the
sensor.
#HANGES
The table below may be used as a very general guideline to how long
sensors may be expected to remain in calibration under optimum
conditions:
pH, ORP 1-2 months
Conductivity 2-3 months
D.O. (polarographic) 2-4 weeks
D.O. (optical, RDO) up to a year if foil is not damaged
ISEs 1 day
TIP: For additional information on calibration schedules, see
the Technical Note on Instrument Calibration in the
Downloads section at www.in-situ.com.
HOW TO CHECK IF A SENSOR IS STILL IN CALIBRATION
Immerse the sensor in a calibration standard of known value and at
the same temperature as the original calibration. Compare the sensor
reading to the solution value. Some drift is to be expected, but gener-
ally the readings should fall within the sensor’s accuracy specification.
If readings fall outside the accuracy specification by an amount that
is not acceptable for your current application, recalibration is recom-
mended. You will quickly learn by experience how often you need to
recalibrate a given sensor based on usage.
TIP: Quick Cal solution may be used for a quick check of
pH, ORP, and conductivity. Refer to the values printed on the
label.
SECTION 10: MONITORING WATER QUALITY: OVERVIEW
When you select the sensor . . .
. . . information
on the last
calibration is
shown
pH calibration information for a combination pH/ORP sensor in port 1