Page 20 of 90
Issue: 0.4
User Interfaces
© Gyr Commercial in Confidence. © Gyr
P450 In Home Energy Monitor - DRAFT User Manual
4.2
Power supply
The P450 IHEM should only be powered from the mains using the 5V switch mode power supply with
which it is supplied.
4.3
Touch screen
The P450 IHEM uses a colour touch screen display. The touch is of the resistive type.
4.4
Battery management
The P450 IHEM can be powered temporarily using 4 x Alkaline AAA (LR03) batteries.
If the P450 IHEM is powered by batteries and no buttons are pressed the batteries will last a period of
72hours.
If the P450 IHEM is powered by batteries and buttons are repeatedly pressed the batteries will last
approximately 1 hour.
4.5
Demand indicator
The front view of the product shows an in-mould light-bar feature. This feature is active always; it both
pulses and changes colour.
The light-bar changes colour to indicate the current instantaneous load. The logic is: green indicates
low load, amber a higher level of demand and red higher still.
This functionality is very simply illustrated below:
instantaneous load indication
Light-bar feature; colour changes
as load increases
Figure 3 Instantaneous Light Bar Operation
4.6
Wall mounting
The P450 IHEM may be wall mounted using two screws (not supplied). The screws used should be
suitable for the material of the wall with which they will be used.
The maximum screw head size is 5mm.
The spacing for the screws is as:
46 mm (+/- 0.15mm)