LUDLUM 272D, User Manual

Model 272D Digital Remote 

February 2016 

page 2 

3. SPECIFICATIONS 
 
INDICATED USE:

 remote display for Model 375 Area Monitor 

DISPLAY:

 0.0 to 9999 or 0.00 to 9999 (same as connected Model 375)  

SYSTEM OK:

 (

green light

) indicates the instrument is functioning properly 

HIGH ALARM:

 (

red LED

) indicates the radiation level exceeds the high alarm point 

LOW ALARM: 

(

yellow LED

) indicates the radiation level exceeds the low alarm point  

RESET: 

pushbutton to reset the alarm condition 

DET FAIL: 

(

red LED

) indicates detector overload, no count from detector, or communication 

failure 

RELAY: 

3-pin connector and form C relay allowing for external alarm indicators 

AUDIO: 

unimorph type with Audio Enable ON/OFF switch (

greater than 68 dB at 2 feet) 

POWER: 

provided by wall-mount adapter, 5.0 Vdc (

regulated) 

Warning! 

If not using the wall-mount power supply that is provided, be sure to fuse the input voltage 
using a 1 amp fuse. 

CONSTRUCTION: 

Aluminum housing with ivory powder coat 

TEMPERATURE RANGE: 

-20 to 50 

°

C (-4 to 122 

°

F); m

ay be certified for operation 

from -40 to 65 °

C (-40 to 150

°

 F)

SIZE: 

16.8 x 20.3 x 4 cm (6.6 x 8 x 1.6 in.) (H x W x D) 

WEIGHT:

 0.68 kg (1.5 lb) 

4.  ENVIRONMENTAL CONDITIONS FOR NORMAL USE 

 
Indoor use only 
 
No maximum altitude 
 
Temperature range of -20

to 50 °

C (-4 

to 122 °

F)

; may be certified for operation from -40

to 65 °

C 

(-40 

to 150 °

F)

 
Maximum relative humidity of less than 95% (non-condensing) 
 
Installation Category II (Overvoltage Category as defined by IEC 1010-1) 
 
Pollution Degree 1 (as defined by IEC 664) (No pollution or only dry, nonconductive pollution 
occurs. The pollution has no effect.)