Fluke Biomedical 945A - Manual (Page 13)

Application
The Model 946A-200 UDR may be used with all VICTOREEN 977 series Ion Chamber Detectors. The
detector/preamplifier, when connected to the UDR, will comprise a single channel digital area monitoring
system. For additional information on various applications, please contact VICTOREEN, Inc.,
Applications Engineering Group.
Specifications
General specifications for the 946A-200 UDR are listed below. The 946A-200 is rated for nuclear
applications, and any repairs to it by personnel not qualified to ANSI 45.2.6, 1978, Skill Level II will void
the nuclear rating.
Main Display Three digits with backlighted radiation units display and floating
decimal point. Three digits plus exponent for data entry/display
Bargraph Display
(Dynamic Range)
Three segments per decade, 10
-1
to 10
7
mR/h (24 segments), tri-
color, indicating channel status.
Alarm Indicators HIGH Alarm (Red LED) - Flashing until acknowledged
WARN Alarm (Amber LED) - Flashing until acknowledged
FAIL Alarm (Red LED) - Does not flash, is not manually acknowledged
RANGE Alarm (Red LED), overrange/underrange - Does not flash,
automatically acknowledges
Alarm Delay 3 minute alarm mute on channel power-up
Display Selection
(Momentary Pushbuttons)
HIGH, High Alarm limit
WARN, Warn Alarm limit
Check Source Activates electronic Check Source and associated green LED
indicator. “Latching pushbutton operation”
Alarm Ack. Alarm acknowledgment: causes alarm indicators to go to a steady on
state after acknowledgment, relays will reset when radiation level
drops below setpoint. Internal jumper causes alarms to be reset
automatically when radiation level drops below set point (no operator
input required).
Power ON/OFF Alternate action push-button for AC power to the unit
Relay Outputs
(Failsafe operation)
HIGH Alarm - 1 set. DPDT rated 5 A @ 120 Vac (one set 120 Vac
powered for use with optional local alarm)
WARN Alarm - 2 sets. DPDT rated 5 A @ 120 Vac
FAIL Alarm - 2 sets. DPDT rated 5 A @ 120 Vac
DC contact rating for all relays is 5 A @ 29 VDC
Analog Outputs
4 to 20 mA (2) and 0 to 10 Vdc, logarithmic and may be scaled for any
one decade (minimum) to the full range of the unit (maximum)
Alarm Ack Input Optically isolated DC input
UDR Electronic Accuracy ± 1% digit (± 1% of the displayed value), exclusive of the detector
energy response
Dimensions
(H x W x D) 3.5 in. x 5.6 in. x 13.5 in.
(8.9 cm x 14.2 cm x 34.3 cm)
Weight Approximately 3.7 lb. (1.67 kg)
Power 120 Vac ±10%, 50/60 Hz, 28 watts (240 Vac optional)
Operating Temperature
32
°
F to 122
°
F ( 0
°
C to + 50
°
C )
Relative Humidity 0 to 95% non-condensing
Compatible Detector 977 Series, Ion Chamber
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