Fluke Biomedical 942A-200L-M4 - Manual (Page 7)

General Information
Application
1
1-3
1.2 Application
The Model 942A-200L-M4 and 942A-200L-M5 UDR’s can be used with Victoreen 943 series beta
scintillation detectors, and 943 series gamma scintillation detectors, equipped with a LED check source.
The detector, when connected to the UDR and 844-211L series Junction Box with LED pulser, will
comprise a single channel digital process monitoring system. Table 1-1 is a list of compatible 943 series
detectors. Please contact Fluke Biomedical Radiation Management Services for additional information.
Table 1-1 943 Series Detectors Compatible with 942A-200L-M4 and 942A-200L-M5 UDR.
Detector
Type Crystal End Window/ Crystal
Configuration
(dia./size)
943-25TL Beta Detector Hi-Temp Plastic Titanium/2 in.
943-25TLA: Beta Detector Hi-Temp Plastic
10:1 Efficiency Reaction Titanium/2 in.
943-25TLB: Beta Detector Hi-Temp Plastic
100:1 Efficiency Reaction Titanium/2 in.
943-36L: Gamma Detector w/ LED
Check Source NaI (TI) Aluminum/1.5 in. x 1
in.
1.3 Specifications
General specifications for the 942A-200L-M4 and 942A-200L-M5 UDR’s are listed below. The 942-200L
series are rated for nuclear applications, and any repairs to it by personnel not qualified to ANSI 45.2.6
1978, Skill Level II may void the nuclear rating.
If a problem develops, the UDR can either be returned to the factory for service, or repaired by a qualified
technician.
Table 1-2. General Specifications for the 942A-200L-M4 and 942A-200L-M5 UDR
Main Display Five digits with back lighted units display
Bargraph Display Three segments per decade, 10 to 10 7 CPM
Alarm Indicators
HIGH Alarm (Red LED) – Flashing until acknowledged
WARN Alarm (Amber LED) – Flashing until acknowledged
RATE Alarm (Red LED) – Not Implemented
FAIL Alarm (Red LED) – Does not flash, is not manually acknowledged
RANGE Alarm (Red LED) – overrange/underrange – Does not flash
Display Selection
HV, High Voltage value
HIGH, High Alarm limit
WARN, Warn Alarm limit
TEST, Initiates Trip Test
SCA/Gross
For the 942A-200L-M4 only, an illuminated alternate action switch is
provided to select either Gross or Single Channel Analyzer counts for
display, analog output and alarm processing. A Green LED indicator built
into the switch illuminates when the SCA mode is selected.
Check Source
Activates with associated green LED indicator, supplies +15VDC to pulser
circuit board in detector
Alarm Ack.
Alarm acknowledgement, resets alarm relay outputs and causes alarm
indicators to go to a steady on state after acknowledgement. Internal
jumper option causes alarms to be reset automatically when system returns
to normal operation (no operator input required).