Multifunction digital AC meter with alarm

This multifunction digital AC meter is designed to simultaneously measure and display voltage (Voltage), current (Amperage), frequency (Frequency) and power (Power) of your AC system. It provides a comprehensive overview of your electrical system's performance.

The 8247-BSS meter includes alarm functions for high voltage, low voltage, and high current. These alarms alert users to potentially hazardous conditions or system malfunctions.

The meter's display features adjustable brightness and a scan mode for easy reading of information. It has three brightness levels.

Yes, on three-button models like the 8247, the arrow buttons allow switching the display between volts, amps, hertz (frequency), and watts (power).

Monitoring voltage is very important, especially when using a generator. Excessive voltage can damage equipment, and significant variations may indicate voltage regulation or fuel supply issues.

Current or ampere monitoring helps prevent overloads, especially when using a limited shore power supply or a camper van battery.

Frequency must be monitored when generators are part of the system. Frequency regulation can affect devices such as clocks, dimmer switches, and the efficiency of transformer-based equipment. Typically, frequency should not vary by more than ± 2 or 3 cycles within the generator's operating range.

The displayed power is the apparent power (Vrms x Irms) and can be used to avoid overloading sources such as an inverter.

To access scan mode, press and hold the button for two seconds. Use the arrow buttons to scroll until 'SCAn' appears on the screen. Press to select scan mode, then use the arrows to choose 'On' or 'Off'.

To set an alarm, switch the meter to display the relevant measurement (e.g., amperes for the high current alarm). Hold the button for two seconds to access the MENU. Use the arrow buttons to scroll to the desired alarm option, then press to select it. You can then choose 'On' or 'Off' and adjust the threshold value.

The meter must be located in an environment safe for high-voltage electrical connections. It should be placed in a visible position with easy access to the buttons, and personnel must not be able to touch the terminals on the rear of the meter. The location must be dry and protected.

The meter's face is splash-resistant and its circuit boards are coated for improved corrosion resistance. However, it is not designed for use in wet environments or for outdoor installation without additional protection.

Before installing the meter, it is imperative to disconnect all AC sources, including generators, inverters, and shore power or dock power. For marine and RV installations, ensure you disconnect the shore power or dock power and disconnect the DC power from the inverter. It is strongly recommended to hire a qualified electrician if you are not experienced in installing AC devices.

Yes, it is crucial to disconnect all AC sources before installing the current transformer (CT). Never power it on while the CT is not connected to the meter. Open CT leads during operation can generate lethal voltages. If the meter must be removed, the CT leads must be short-circuited.

Yes, a twisted-pair wire must be used for current transformer connections. This minimizes susceptibility to electrical noise, as the signal generated by the CT is very weak.

Yes, the 8200-series meters can be used to measure current flow in both phases of a 240-volt single-phase system with three or four wires. However, this requires the use of a switch specifically designed for this purpose.

A special switch is required, designed to short-circuit the secondary of the current transformer (CT) except when connected to the meter. Blue Sea Systems offers the PN 8410 switch and panel for 120/240V applications. Similar switches are also manufactured by ElectroSwitch (series 31), Allen Bradley, and Kraus & Naimer.

Yes, unlike single-function meters such as models 8237 (voltmeter), 8238 (ammeter) or 8239 (frequency meter) from the same brand, the 8247-BSS consolidates voltage, current, frequency and power measurement into a single unit, providing a practical overview of your system's performance.

If the current transformer (CT) is left in an open circuit while primary current is flowing, high voltages are generated. If these voltages are connected to the meter, they may cause damage not covered by the warranty.

When power is applied, the display performs a self-test sequence that lights up all function LEDs.