Metrohm 812 Valve Unit - Manual (Page 20)

4.1 Technical data
812 Valve Unit
17
4 Appendix
4.1 Technical data
Parts and controls
Keypad Chemically resistant membrane keypad made of
polyester with function keys
Indicators LEDs for display of valve position
Power supply
External External supply via DIN connector:
5 V / 0.5 A
24 V / 2 A (transient, 200 … 300 ms)
1
4 5
3
6
7
2
1 +5 V DC / 0.5 A
2 not assigned
3 +24 V DC / 2 A
4 0 V (digital) *
5 0 V (analog) *
6 Ground
7 Ground
* Pin 4 and Pin 5 must be
connected in the vicinity
of the power source ("zero
point of star")
Valve interfaces
Connection Function
Inputs
0V Ground Ground
+5V
10k Ω
Fill
Valve → "FILL"
Valve is switched to the "FILL"
position
H
L
t
P
> 2 ms
+5V
10k Ω
Inject
Valve → "INJECT"
Valve is switched to the "INJECT"
position
H
L
t
P
> 2 ms
Outputs
COM
RUN
Position "Fill"
A pulse is outputted when the
valve is switched to the "FILL"
position. H
L
t
P
≅ 250 ms
COM
RUN
Integrator Start
A pulse is outputted when the
valve is switched to the "INJECT"
position. H
L
t
P
≅ 250 ms