Teledyne 514 - NDIR analyzer - Manual (Page 23)

2–11
Operational Theory 2.0
Teledyne Analytical Instruments
A Business Unit of Teledyne Electronic Technologies
Power for the control module is provided by a center-tapped trans-
former which takes the 115 VAC input, reduces it to 40 VAC, and feeds the
voltage to a DC power supply identical to the one installed in the detector
module. Power supply outputs are +24 VDC unregulated, and +15 VDC
regulated.
Ext. Volt.
Amplifier
Alarm
Comparator
Auto
Zero
Timer
Manual Setpoint Adjust.
#1 #2
Relays
N.O.
Com.
N.C.
N.O.
Com.
N.C.
E-to-I
Converter
Current
(4 to 20 mA)
Standard
Valve
Control
Signal
Span
Adjust.
Meter
Indication
Voltage
(0 to 1 V f.s.)
Millivolts
(0 to 5 mV f.s.)
To I-to-E Converter
To Timer
15 VDC
24 VDC
Power
Supply
Power
Transformer
Manual
Fine Zero
Power
115 VAC
60 Hz
Input
I-to-E
Converter
Current
Signal
Input
From
Analysis
Unit
115 VAC
60 Hz
Output
±
±
Figure 2-5. Control Module - Block Diagram