6.
OPEN FAILURE
: Metiri™ encountered an error attempting to start a new file, or open an existing file. This is
usually caused by the card locked to read only or something in the file system is preventing Metiri™ from
writing to the SD card. The error will need to be corrected before the microSD card can be used.
7.
WRITE FAILURE
: Metiri™ received back a different value for the number bytes that should have been written
to the card. Metiri™ will stop using the SD card to prevent corrupting existing data. The card should be
removed and repaired using a CHKDSK or similar utility.
Removing an SD Card Data:
Metiri™ needs to unmount the microSD card and close out the file being used for
recording of data before the card should be physically removed. This is accomplished by touching the ENTER button
twice so the user is prompted with, "
Eject SD Card?
". Touching SELECT will cause the current file to be closed, and
card to be unmounted. When the user is prompted with, "
SD CARD EJECT, Ready to remove
" the microSD card
can be removed.
To remove the microSD card, grasp the edge of the card firmly and pull straight out. The Metiri™ does not use a card
ejection mechanism to ensure the card does not accedentially fall out during use.
Removing the microSD card before unmounting it can cause data curruption. If this happens, Metiri™ will force the file
system to be unmounted and prompt the user,
"SD CARD REMOVED, NOT UNMOUNTED
".
Notice Summery:
The following rules should always be obeyed when using the Metiri Smart Energy Meter.
1. Working with electricity can be dangerous. Always use the Metiri Smart Energy Meter with an inline fuse and
consult a professional before using this device.
2. Never exceed 70A for any sustained length of time. If 70A is exceeded, the Safe Operating Current time
should be used as a reference to the safe time at higher current.
3. The Safe Operating Current can vary according to temperature, humidity, and altitude. Saftey testing was
performed in a 25°C ambient environment, at less than 15% humidity and an altitude of 6,200 feet.
Temperatures or humidity levels higher than the stated values will decrease the Safe Operating Current levels
and time.
4. Never touch the wires when operating the unit. They may be hot and can cause burns to exposed skin or
material.
5. Do not allow the unit to be exposed to the elements. Direct sunlight or exposure to rain and moisture can
damage the unit.
6. The Metiri-H and Metiri-S models are not waterproof. If the Metiri units gets wet, do not use. If you notice the
unit is wet while in use, do not touch it! Electrical shock hazard may exist.
7. The Metiri can read alternating current (forward or reverse current flow) as long as voltage always stays
negative. A negative voltage from the positive (RED) to negative (BLACK) wires can damage the unit.
8. Metiri-H and Metiri-S units were designed to record very large DC currents, so accuracy at very low currents is
not guaranteed.
Equations, Acronyms, and Facts to Remember:
It is important to understand the difference between units of
energy or charge when trying to track energy flow. A Joule is a derived unit of energy in the International System of
Units and is equal to one watt (1 volt * 1 Amp = 1 Watt) for one second (1 watt x 1 second = 1 Joule).
EXAMPLE: Consider a 12V battery connected to an inverter needing 100 watts of constant power for an off-grid AC
solution for one hour. The amount of energy needed is simply (Power x Seconds = Joules or Ws) 100Wh or 360,000Ws
or 360,000 Joules. The inverter will always require 100 watts regardless of the battery voltage, therefore as the
battery voltage starts to drop the amount of current needed to equal 100 watts goes up. (P = V x I so I = P / V) Using
Ah to measure energy, makes this very difficult as voltage will constantly be changing.
•
Volts = Current in Amperes x Resistance in ohms (V=I*R)
•
Power = Volts x Current (P=V*I)
•
Coulombs = Volts x Capacitance in Farads = Current x Time in seconds (Q=V*C=I*T)
•
Energy in Joules = Power x Time in seconds (J=P*T)
•
1 Joule (J) = 1 Watt Second
•
3,600,000 Joules (J) = 3,600,000 Watt Seconds (Ws) = 1,000 Watt Hours (Wh) = 1 Kilowatt Hour (1KWh)
•
Electrons are negativly charged. So when you plug a load into a battery, current is actually flowing from
negative (Ground) to Positive.
•
Metiri in Latin means to measure or estimate.
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