Metrohm 876 Dosimat plus - Manual (Page 67)

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8 Appendix
876 Dosimat plus
￭￭￭￭￭￭￭￭ 59
8.7 Pulse control
The 876 Dosimat plus can be controlled by a control device via an elec-
tronic pulse control for simple dosing. Controlling is carried out via the 9-
pin remote interface. The pulse control is integrated in the DOS method
(manual dosing), whereby the pulse control replaces the manual dosing.
However, all functions of the method (result calculation, report output,
etc.) are available.
Remote control
A pulse (
≥ 1 ms) on the remote line Input 0 triggers a single dosing step
of 1/10000 of the cylinder volume. The smallest volume of a dosing step
always depends on the cylinder volume of the exchange unit used.
The dosing pulses are immediately put out at executing on the remote line
Output 3 (50…500 µs).
The filling of the dosing cylinder can be triggered on the remote line
Input 1.
Functional assignment of the remote interface:
Pin No. Assigment Function
1 Output 0 Ready (low)
4 Output 3 Pulse out (low)
5 Output 4 Error (low)
6 GND
8 Input 0 Dosing (low)
9 Input 1 Fill (low)
Further details about the remote interface see Remote interface, page 56.
Autostart pulse control
In order to guarantee an unattended remote control of the 876 Dosimat
plus, the parameter "Autostart at power-on" can be activated. The instru-
ment thus starts the loaded method immediately after switching on and is
ready to receive and carry out dosing pulses. Pressing the [GO] key for
starting the method is therefore not necessary.
Manual interventions
Manual dosing is not possible with activated pulse control. The [GO] key
is deactivated. The [FILL] key triggers the filling of the cylinder and at the
same time finishes the method.