Hach-Lange BIOGAS User Manual - Manual (Page 36)

36
Standard Operations
Note: When a combined electrode has been
defined, the instrument will prompt you to specify if it
has a built-in temperature sensor or not.
Note: When a single electrode has been defined,
the instrument will prompt you to define a reference
electrode in the Edit electrode screen.
10. When a combined or a reference electrode
has been defined, enter the potential (in mV) of
the reference element versus the Standard
Hydrogen Electrode (SHE).
This parameter enables to run calibration with
automatic buffer recognition when working with
different reference electrode systems. See the
table giving the potential at 25°C versus the
SHE of a few "reference elements/filling
solution" couples (
Table 4 ).
Note: When a combined pH or a single pH
electrodes has been defined, enter the internal pH of
the electrode (pH int).
11. Press 1 to confirm.
12. Edit the electrode parameters.
Table 4 Potential versus SHE of Reference electrodes
Reference element filling solution
Potential versus
SHE
«Catalog list» electrodes
Hg/Hg
2
Cl
2
- Saturated KCl
SCE: Saturated Calomel Electrode
+244 mV
pHC4000, pHC4001, pHC4006, XC601,
REF401, REF421, REF451, XR100, XR110,
XR130, XR150, MC408Pt
Hg/Hg
2
Cl
2
- 1M LiCl
NCE: Normal Calomel Electrode
+280 mV REF921
Hg/Hg
2
SO
4
- Saturated K
2
SO
4
+651 mV
REF601, REF621, XR200,
XR230, MC602Pt, MC6091Ag
Hg/Hg
2
SO
4
- 1 M H
2
SO
4
+616 mV
Hg/HgO - 0.1 M KOH +174 mV XR400, XR430, XR440
Ag/AgCl - Saturated KCl +199 mV
XR300, XR820, XC100, XC111,
XC120, XC161, XC200, XC250
Ag/AgCl - 3 M KCl +208 mV
pHC3001, pHC3005, pHC3006, pHC3011,
pHC3081, pHC3185, REF321, REF361,
MC3051Pt, ISEC301F
Ag/AgCl - 1 M KCl +235 mV
Ag/AgCl - 0.6 M KCl (sea water) +250 mV
Red Rod - Saturated KCl +199 mV
pHC2001, pHC2002, pHC2003, pHC2005,
pHC2011, pHC2015, pHC2051, pHC2085,
pHC2401, pHC2441, pHC2501, pHC2601,
pHC2701, REF200, REF201, REF251,
REF261, MC2095Sb, MC201Au-8