Internal; Batteries; Environment; Temperature - Thermo Scientific RO-20 Operating Manual

• Light Switch, for meter light.
1.4.5.2

Internal

• Five calibration controls, one for each range.
1.4.6

Batteries

• Main power: Five AA cells.
• Chamber bias: 3 ea 12V alkaline batteries = 36V.
• Life: AA cells, widely variable according to RO-20 usage and battery type.
• Typical alkaline: mR/h ranges, 2500 hrs; all other positions, 130 hrs.
• 36 Volt chamber bias battery life: Totally dependent upon the usage of the "Battery 2"
position of the range switch. The battery capacity should allow for at least 50,000 five-
second battery checks. The battery drain is negligible on all other positions of the
Function Switch.
Note : Frequent or continuous use of the light will reduce battery life significantly. ▲
1.4.7

Environment

1.4.7.1

Temperature

Operable from –40 °F to 140 °F (–40 °C to 60 °C). For operation below 0°F (–18 °C),
alkaline or nickel-metal-hydride AA cells should be used.
1.4.7.2

Temperature Compensation

The detector is fully compensated over the operational temperature range, for output accuracy
within 10% ± 0.5 mR/h.
1.4.7.3

Moisture

Seals used at openings for dust and water resistance. Detector is protected by a silica-gel
desiccant.
1.4.7.4

Humidity

Operable from 0 to 95%, no condensing.
Ro-20
Löw 08.10.2008
RB-XXX-XXXXXX E 1-5