Metrohm 822 Titration Curve Simulator User Manual

Page 25

Appendix

822 Titration Curve Simulator, Instructions for Use

Meaning of the red status LEDs:

DAISY:

With the serial protocol several devices can be at the same bus one af-

ter the other in a so-called daisy-chain configuration but only one of

them is active. The so-called daisy signal is produced with SHIFT,

STROBE and the momentary condition of SER_IN to switch to the next

device.

COND.:

When "Conditioning OK" is displayed on the titrator, no further pulses

are coming from the titrator and the voltage at the "Analog Output" 7

remains at the same level. The air humidity is not simulated. After press-

ing "Sample Add" 3 the LED "COND" is switched on to show that the

Karl Fischer curve is running now.

SIMI NOT OK:

When switching on the titrator a self test of the internal reference and

supply voltages is carried out in the 822 Titration Curve Simulator. The

self test is carried out also at a reset of the Curve Simulator caused by

rotating the cock at the dosing device or a reset command on a serial

transmission. After the self test the display changes to "SIMI OK".

Meaning of the green status LEDs:

CURVE STATE:

If the 822 Titration Curve Simulator recognizes pulses for ejecting at the

dosing device, the LED "CURVE STATE" starts blinking i.e. it stays dark

for 500 pulses and bright for the next 500 pulses and so on.

CURVE 6000:

not in use

CURVE 20000:

If dosing is done with a 805 Dosimat or with the internal dosing drive of

the Titrando and a stroke with 20'000 pulses is ejected, this LED is

blinking synchronously with the LED "CURVE STATE".

SIMI OK:

see SIMI NOT OK