SENTINEL 1

The sentinel is an energy change detection system. It is designed to indicate relative energy change - not absolute unit measurement.
It can selectively, individually detect changes in electric or magnetic fields.
The primary use is as a stationary detector but it can also used as a portable system.
The Sentinel can perform similar functions to an EMF meter -- differently.

LED DISPLAY
The Sentinel systems do not give digital/numeric information on a difficult to see LCD display, it is designed indicate energy change based on the selected sensor in real-time
on the visible 9 LED display. It also contains a volume controlled tone generator to give an audio response as a changing tone.

The inclusion of a LED display allows the meter to be used and observed from a distance in light or dark locations.
When set up correctly ideally only the central green LED is illuminated, this indicates a neutral energy detection, but at the users decision, in a location of noisy electro-magnetically surroundings, 3 illuminated LED's can be accepted.

During stationary use a slow moving energy field moving within range of the Sentinel will cause the LED display to move to the left or right, indicating a positive (+) or negative (-) energy change effecting the sensor.

During a walking location assessment, if the LED display extends outward this is a reaction to an alternating field changing, usually changing polarity at 50 times a second.
The amount of extended movement of the LED's is relative the sensitivity settings.
This can be using the electric or magnetic sensors.

SENSORS
Using the Sentinel 1, first decide and select the required sensor with the input selector switch.
The extendable telescopic Ariel is used to detect electric fields, this can be used fully retracted (minimal sensitivity) on a walk around survey or fully extended (maximum sensitivity) for stationary use.
A built-in coil detects magnetic fields. If the display reacts slowly on a walking assessment this can be from large magnetic objects or from lines of flux of the earths magnetic field.

Select [E] to detect electric fields, select [M] to detect magnetic fields. Select [A] to use the auxiliary inputs (with approved sensors only).

CONTROLS
The on/off toggle switch sets the Sentinel in a high or low sensitivity range, up = high, down = low, center = system off.
The variable sensitivity is used to control the maximum usable sensitivity to suit the environment.
The use of an on/off toggle switch allows the Sentinel to work without the need to be constantly held and therefore allows observation from a distance.
The Sensitivity control is used to set the maximum usable sensitivity, the Centre Control
is used to adjust the position of the centre illuminated LED

SETUP PROCEDURE
Decide the type of sensor you will use with the input sensor selector.
In any new location turn the variable sensitivity control anti-clockwise to minimum, turn the Display Center control to the mid position.
Turn the Sentinel on with the on/off/on switch down, in the low setting, slowly increase the sensitivity by rotating the variable sensitivity control clockwise.
An increased number of illuminated LED's indicates detection of energy, adjustment of the Display Center control may be required to keep the LED centered.

When used in on a walk around evaluation, it is for the user to decide the LED display set-up.

When used as a fixed sensor a greater sensitivity can usually be set, this will usually require several adjustments on the variable sensitivity control and the Display Center control.
when detecting electric fields, as when the Ariel/sensor is fully extended the approach of the user will be detected,.

UNDERSTANDING THE DISPLAY.
In difference to the linear display found on a standard EMF meter, the LED display on the Sentinel shows changes (positive) and (negative) in electrical charge or magnetic field.
When moving the unit near a mains 50 hertz field (electric or magnetic) the display will gradually extend out left and right indicating a changing - alternating field, movement is relative to the sensitivity settings and the selected sensor.