4 maintenance – malfunctions, 5 appendix, List of figures – Metrohm 791 VA Detector User Manual
Page 6
Table of contents
791 VA Detector
II
4 Maintenance – Malfunctions
..........................................
31
4.1 Maintenance and servicing ...................................................................31
4.2 Shutdown..................................................................................................31
4.3 Malfunctions and their rectification .....................................................32
4.4 Instrument test with the dummy cell....................................................34
4.4.1
Check of "meas" and "damp" commutators and
of current amplifier offset ............................................................ 34
4.4.2 Check
output voltage.................................................................. 35
4.4.3
Check of current compensation ................................................. 36
4.4.4
Check of current and voltage overload ...................................... 38
4.4.5
Check sensitivity knob
8
............................................................. 39
4.4.6
Check of noise from current amplifier......................................... 40
5 Appendix
.................................................................................................
41
5.1 Technical
data..........................................................................................41
5.2 Standard
equipment ...............................................................................43
5.2.1
2.791.0010 VA Detector for HPLC .............................................. 43
5.2.2
2.791.0020 VA Detector for IC .................................................... 44
5.3 Optional
accessories..............................................................................45
5.4 Warranty and conformity .......................................................................46
5.4.1 Warranty ...................................................................................... 46
5.4.2 EU
Declaration of conformity ...................................................... 47
5.4.3
Certificate of conformity and system validation.......................... 48
5.5 Index..........................................................................................................49
List of figures
Fig. 1:
Front of the 791 VA Detector............................................................................. 2
Fig. 2:
Rear of the 791 VA Detector.............................................................................. 3
Fig. 3:
Setting the mains voltage.................................................................................. 9
Fig. 4: Connection
656 – 791 ..................................................................................... 10
Fig. 5:
ELCD cell assembly ........................................................................................ 12
Fig. 6:
Connection of ELCD cell at detector block..................................................... 13
Fig. 7:
Connection of ELCD cell at 791 VA Detector.................................................. 13
Fig. 8:
Selection of polarization voltage ..................................................................... 17
Fig. 9:
Circuit of 6.2813.020 Dummy Cell................................................................... 34