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When the PURGE button (solenoid valve) is in the ON position, NC is open and NO is
closed, thereby allowing an eluent to flow out of the sample cell to the waste liquid
receptacle by way of the reference cell.
When the button is in the OFF position, NC is closed and NO is open,
thereby allowing the eluent to flow from the sample cell directly to the waste liquid
receptacle without going through the reference cell.
When the pressure in the flow path has become excessive, relief valve will reduce
the pressure.
4-3 Electric Circuit
The electrical circuit of Shodex RI-504 consists of two I/V converters, a signal
processing circuit (with display and keyboard), a temperature control circuit and
a light intensity control circuit.
The temperature control circuit and light intensity control circuit are controlled by
the signal processing circuit.
Fig. 4.5 shows electrical system block diagram of the RI-504.
2
1
2
8
9
10
11
12
13
14
15
1 : Light source
2 : I/V converters
3 : Keyboard
4 : Display
5 : Signal Processing circuit
6 : Light Intensity Control circuit
7 : Temperature Control circuit
8 : Null glass driver
3
4
5
6
7
Temperature sensor(internal)
9 :
Temperature fuse(internal)
10 :
11 : Heating element(internal)
12 : Temperature sensor(external)
13 : Temperature fuse(external)
14 : Heating element(external)
15 :
Solenoid Valve
16 :
Integrator Output
Fig. 4.5 Electrical System
- 6 -
16
17
18
19
20
21
22
23
17 :
Recorder Output
18 :
LAN port
19 :
Signal In (Purge)
20 :
Signal In (Zero)
21 :
Signal Out (Ready)
22 :
Signal Out (Leak Out)
23 :
Signal Out (Error)
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