Page 4
Wahl DHS520
User Manual
2.0 SPECIFICATIONS
Temperature range:
550 to 3000°C / 1022 to 5432°F (actual)
600 to 3000°C / 1112 to 5432°F (specified)
Viewfinder display:
4-digit temperature in 1° steps
External display:
Peak, Continuous, Average and Valley temperatures
on LCD display panel
Optical system:
9° field of view with 1/3° measuring circle; single-lens-
reflex system; with eyepiece adjustment from -3.75 to
+2.5 diopters
Focusing:
1m/39.4in. to infinity (standard) from body datum
nominally 450 to 620mm/17.7 to 24.5in. (135 c.u.lens)
nominally 215mm/8.5in. fixed focus (110 c.u. lens)
Minimum target diameter:
4.8mm/0.19in. at 101.4cm/39.9in. (standard)
1.8mm/0.07in. (135 close-up lens)
0.4mm/0.02in. (110 close-up lens)
Detector:
silicon photocell
Spectral response:
nominally 0.85 to 1.10
µ
m
Emissivity adjustment:
0.10 to 1.20, in 0.01 steps
Response time:
digital display update: 0.5 seconds (approx.); peak and
valley operation: acquisition time 30ms (approx.)
Operating temperature range:
0 to 50°C (32 to 122°F)
Storage temperature range:
-20 to 60°C (-4 to 140°F)
Accuracy:
<0.25% of reading (K or °R)
Repeatability:
<1°C
Drift with ambient temperature:
<0.15%(C)/10°C, <0.10%(F)/10°F
Power source:
one 9V dry battery (Duracell 6LR61/12232 or
equivalent); typical alkaline battery life: >100hrs in
‘from-factory’ configuration
Digital outputs:
ASCii code; RS232 serial out
IP rating:
IP40
Dimensions:
210 x 70 x 140mm / 8¼ x 2¾ x 5½in.
Weight:
800g/1lb12oz (without battery)
Standard accessories:
lens cap; 9V alkaline battery; protective window; dark
glass eye protection filter; wrist strap
Optional accessories:
type 135 and 110 close-up lenses; protective hard
carry case.
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