TEMPHION INSTRUCTIONS
Seametrics • 253.872.0284
Page 22 seametrics.com
and the sensor may read erratically!
Excess filling solution
spills over, forcing out
any air bubbles
•
Once filled, be sure the O-ring is in the upper
groove to prevent reference solution leakage and
contamination.
Before deploying be sure to move
the O-ring to the lower groove to expose the
liquid junction port.
pH Field Calibration Temperature Chart
The pH of any buffer varies slightly with temperature
change. For this reason, it is important that you determine
the current pH value of the buffer you are using during
calibration. From this chart, determine the pH value at
your current buffer temperature and use this value as the
“Ref pH” value in the Settings and Calibration window. For
example, if you are using a pH buffer of 7 and your buffer
temperature is 20 degrees C, then you would enter 7.02 in
the Ref pH box.
Calibration Temperature
˚C
˚F
pH 4.00
pH 7.00
pH 10.00
10
50
4.00
7.07
10.19
15
59
4.00
7.05
10.12
20
68
4.00
7.02
10.06
25
77
4.00
7.00
10.00
30
86
4.02
6.99
9.94
35
95
4.02
6.98
9.90
40
104
4.04
6.97
9.85
45
113
4.05
6.97
9.82
50
122
4.06
6.97
9.78
MAINTENANCE and REFERENCE
M & I Range for pH Calibration
There are three variations of TempHion pH configuration.
Depending on which way yours is configured, your M and I
values should be between those values shown in the chart
below when you calibrate the sensor.
To determine which configuration you have, you will need
to create a short data file, then retrieve and export the
data—it doesn’t matter whether the sensor is deployed, or
in a buffer, or just in air for this. Once you have exported
your data file, open it in Excel and note the P and H values
for the pH channel.
• If P = 2.97 and H = 0.567, this is the preferred
configuration.
• If P = -2.389 and H = -0.29, this is an older
configuration. This can still be used, but if you need
higher accuracy, contact Seametrics for instructions
on how to reconfigure.
Depending on which version you have, your M and I
values during calibration of the pH channel should be the
following ranges.
How to Store and Recondition
When storing your TempHion, care must be taken to
properly protect the electrodes, including the reference
electrode. After storage, before use, the electrodes may
need reconditioning, depending on the electrode and the
mode of storage. Seametrics’ recommendations follow. If
you have further questions, please contact your Seametrics
technical support representative.
Storage
Reference Electrode
•
Best if stored in filling solution.
• Alternately, can be stored in KCl.
• If storing dry, be sure to empty and clean reservoir.
pH bulb / ORP
• Best if stored in pH 4 or KCl.
• Can be stored dry, but may shorten life of bulb. In
Seametrics’ experience, the bulb should last roughly
two years if typically stored dry.
ISE
• Storing dry is best.
P = 2.97
H = 0.567
P = – 2.389
H = – 0.29
P = 6.76
H = 0.567
Range for M
–53 to –57
–50 to –60
–50 to –60
Range for I
240 to 270
180 to 300
108 to 300
