EUTECH INSTRUMENTS CARBON DIOXIDE GAS Instruction Manual page 18

Instruction Manual
Low Slope or No Slope
incorrect internal filling
solution
total sample level
electrode in sample
too long; CO loss
2
membrane failure
(wet, perforation, discoloration)
samples and standards
not at constant
temperature
heat generated by
magnetic stirrer
defective inner body
electrode exposed to
air for extended period
standards contaminated
or incorrectly made
buffer not used
standard used as
buffer
electrode exposed
to air for extended
period
membrane failure
(wet, perforation, discoloration)
defective inner body
18
Carbon Dioxide Electrode
refill outer body of electrode
using filling solution shipped
with electrode
dilute sample of dissolved
species above 1M
reduce surface area-to-
volume ratio, slow down rate
of stirring, avoid high
temperatures
replace membrane
allow samples and standards
to come to room temperature
before use
place insulating material
between stirrer and beaker
Checking the
refer to
Electrode Inner Body
hold electrode by outer body
and pull on electrode cable.
Internal filling solution will
flow under membrane and
restore electrode response
prepare fresh standards
use recommended buffer
use buffer
hold electrode by outer body
and pull on electrode cable.
Internal filling solution will
flow under membrane and
restore electrode response
replace membrane
Checking the
refer to
Electrode Inner Body