- 6 -
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
4
4
4-
-
-
-3 Electric Circuit
3 Electric Circuit
3 Electric Circuit
3 Electric Circuit
The electrical circuit of
Shodex
RI-501EX 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-501EX.
1 : Light source
9 :
Temperature sensor(internal)
17 :
Recorder Output
2 : I/V converters
10 :
Temperature fuse(internal)
18 :
LAN port
3 : Keyboard
11 : Heating element(internal)
19 :
Signal In (Purge)
4 : Display
12 : Temperature sensor(external)
20 :
Signal In (Zero)
5 : Signal Processing circuit
13 : Temperature fuse(external)
21 :
Signal Out (Ready)
6 : Light Intensity Control circuit
14 : Heating element(external)
22 :
Signal Out (Leak Out)
7 : Temperature Control circuit
15 :
Solenoid Valve
23 :
Signal Out (Error)
8 : Null glass driver
16 :
Integrator Output
Fig. 4.5 Electrical System
1
3
4
5
6
7
9
10
11
12
14
16
17
18
8
19
20
21
15
2
13
2
22
23