4-46 | Model 933 UV Analyzer
Temperature Zone
Temperature (°C)
The real-time operating temperature for each temperature zone
(Bench/Cell/Column).
Duty Cycle (%)
The real-time duty cycle of each temperature zone (Bench/Cell/
Column).
Scaled Analog Input
The analog input or scaled parameter.
Bench Temp (°C)
The real-time Optical Bench temperature.
Cell Temp (°C)
The real-time Measuring Cell temperature, or the default.
Column Temp (°C)
The real-time Column temperature.
Cell Pressure (mmHg) (optional)
The real-time Measuring Cell pressure, or the default.
Digital IO (input/output)
Digital In
The analyzer has two digital inputs (J101, Customer I/O board),
each of which is designed to accept a contact closure. Input 1 is
used for the remote start of the Auto-Zero sequence. Input 2 is
used to enable or clear alarms. Close the contact to enable Concen-
tration 1 and Concentration 2 alarms. Toggle the contact to clear
any latched alarm. The contact must remain closed for at least 1
second. Refer to the Customer I/O board in the section “Start-Up
and Verification” in Chapter 3.
The digital inputs are isolated from the digital logic power supply
of the analyzer. The isolation can be analyzer-powered or custom-
er-powered. The selection is made through JP401 on the Customer
I/O board, as defined below.
Digital Input Isolation Power Supply
Power Supply JP401 Position
Customer +15V to +24V 2-3 (default)
Analyzer +24V 1-2
Solenoid
Displays energized solenoids (Zero, Column A, Column B).
Alarm
Displays the type of any active alarms.
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