Page 9
Chapter 2 Installation
Power Supply Requirements
The Ultra Twin can operate from AC supply or from a DC battery and is
designed for use in temperatures between -4
o
F to +140
o
F (-20
o
C to +50
o
C).
The AC is 115 +5% / -10% 50/60Hz. The DC is 18-30V. In all cases the
Ultra Twin will typically consume 6W of power, with a maximum of 10W.
If Ultra Twin has both an AC and DC supply available then the AC supply
source will be automatically sensed and used, should the AC supply be
removed for any reason then the DC supply will take over.
The AC and DC wiring should be completed using either 16 – 14AWG
(1.5–2.5mm
2
) stranded or 16 – 14AWG (1.5–4mm
2
) solid wire, with all
terminals being tightened to 4.5in. lbs. (0.5Nm).
An external supply isolator/circuit breaker (AC or DC) must be fitted near to
the unit and labelled to identify the instrument to which it refers.
Safety Symbols
Detailed below are descriptions and meanings of safety/warning symbols
that are used on the Ultra Twin and in this manual.
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