Tophit H CPS471/CPS471D
10
Hauser
Performance characteristics
Response time
< 5 s
for buffer change from pH 4 to pH 7 under reference operating conditions
!
Note!
The response of the integrated temperature sensor can be slower with extreme temperature changes.
Reference operating
conditions
Maximum measured error
Repeatability
± 0.1 % of measuring range
Start-up drift
Everytime when switching on the measuring device a control loop is set up. During this time the measured
value moves to the true value.
The settling time depends on the kind of interruption and the interruption time:
• Supply voltage interruption, sensor left in medium: approx. 3 to 5 minutes
• Interruption of the fluid film between pH sensitive ISFET and reference lead: approx. 5 to 8 minutes
• Longer dry storage of the sensor: up to 30 minutes
Installation
Installation angle
ISFET sensors can be installed in any position, as there is no liquid internal lead. However, in case of an
overhead installation, a possible air cushion
2)
in the reference system might interrupt the electrical contact
between the medium and the diaphragm.
!
Note!
• The installed sensor may be held under dry conditions for maximum 6 hours (also applies to overhead
installation).
• Make sure you comply with the instructions in the operating instructions for the assembly used.
Reference temperature:
25 °C (77 °F)
Reference pressure:
1013 mbar (15 psi)
pH:
± 0.2 % of measuring range
Temperature:
Class B acc. to DIN / IEC 751
2)
The sensor is delivered without air cushions. Air cushion formation is possible in case of working with vacuum, e.g. cleaning out of tanks.
a0003897-en
Fig. 10:
Angle of installation
advised angle of installation
permissible with respect to
the application specific
conditions
