The single-rate electricity meter Mercury 201 is designed for commercial metering of active electrical energy at 230 V mains voltage and 50 Hz frequency. The device provides registration and storage of electric power readings and is convenient for installation in an apartment, garage or country house.
Design features
Structurally, all 201 series electric meters are made in a plastic enclosure of the same type and rectangular shape. Based on the model range, they can be electromechanical or electronic. In the first case, the counting system is a drum, in the second - an LCD display. Both the drum and the display are located on the front panel on the left, and on the right there is a table with technical specifications. The screwless device of the electricity meter Mercury 201 protects it from burglary as much as possible and provides sufficient tightness.
The device is compact and fixed on a wall or other surface with a din-rail. This method of mounting is the most reliable.
The design of the bottom of the enclosure is removable and designed to protect the contacts, which can be accessed after removing the cover. The wires are connected with a screw connection.
To determine how much space the Mercury 201 series meter takes in the electrical panel, you need to know the number of modules of the device. In different models it may not be the same. There are cases where the electric boards do not fit the dimensions of the metering device, and for them have to cut special holes. Only in this case it is possible to firmly fix the electricity meter inside the panel on a din rail. To find out how many modules takes Mercury 201 meter, you can get acquainted with the parameters of its modifications.
Basic and additional characteristics
There are differences in the technical characteristics of the device, depending on the model, but common for 201 series meters is accuracy class 1. This corresponds to the requirements of regulatory documents (no more than 2) and indicates a low measurement error. The device is protected by a polarity reversal system against the possibility of external influence on its operation. It is not possible to stop the device or affect the accuracy of the data.
Main characteristics:
- Nominal mains voltage - 230 V;
- rated current - 5(60) - 10(80) A;
- sensitivity threshold - 10/20/40 mA;
- temperature range within -40...+75⁰С;
- mass 0,25 (0,35) kg.
Additional characteristics:
- service life - 30 years;
- 3 years warranty period.
Modifications
The single-phase electronic meter Mercury 201 has 7 modifications: from 201.2 to 201.8, differing by the nominal and starting current, power consumption, the data display mode, the range of operating temperatures, the number of modules, dimensions and weight. The other parameters of the devices of this series are the same.
If you are guided by the price, the cost of the meter is most affordable in the set with a drum counting device. Such devices are simple in design, they have the smallest pulse transmission number per kWh - 3200, sensitivity values are 10, 20 or 40 mA, power consumption - 2 W. In addition to the acceptable cost, the device is in demand for its reliability, resistance to overloads and long service life.
Among the devices of this series the most popular models are electricity meters Mercury 201 5 and 201 7, which differ from each other only in dimensions and weight. The dimensions of the meters of the first model are 65x105x105 mm, the dimensions of the second model are 66x77x91 mm. The difference in weight is 100 g (350 vs. 250). If the difference in weight is not so significant, then the dimensions are important for proper selection of the electric panel and ease of installation. The advantage of the Mercury 201 7 is that it does not take 6, but only 4.5 modules. This saves space in the switchboard, does not require additional cutouts and is aesthetically pleasing.
The electricity meter can be equipped with a remote control (RC). For this purpose, a programmable module is installed inside the device that responds only to the reception of remote control signals. After the microcontroller is installed, pressing the remote control button interrupts the meter reading, while the electricity is supplied to the room, and the indicator continues to signal that the device is working normally. There is no sign of external interference with the operation of the devices.
The Mercury 201 meter with remote control allows you to save up to 50% of electricity.
Externally the remote control is similar to a car alarm key fob and allows you to regulate the device from a distance up to 50 m.
To select the economical option of operation, you need to turn the remote control into an undercounter mode. It is desirable to pay attention to the number of blinks of the indicator when the counter switches. They should be from 3 to 30. The device works normally if the counting mechanism has remained in place for 2 and 3 flashes of the indicator.
The microcontroller is tuned to a frequency of 315 mHz, which allows it to work without failure.
When the economy function is disabled, the meter functions in the factory mode.
Wiring diagram
Connection of the meter of Mercury 201 brand is made without any special features, similar to other electricity meters. The device is accompanied by a detailed manual, which should be studied, along with the passport and wiring diagram. The main thing is the correct connection of phases and attention when connecting the wires (their markings are highlighted in different colors).
Before you connect Mercury 201, it is necessary to de-energize the system: turn off the circuit breaker, breaker, power line. Special cells with perforated grooves are provided on the terminal cover for safe laying of wires. In these places, the cells are broken out, and through the holes the wire is entered.
There are four positions for connecting the wire:
- The supplying phase from the input circuit breaker.
- The phase load to supply the room.
- The neutral wire from the input circuit breaker.
- Zero wire of the load to supply the room.
Wires are connected only in this sequence. Remember that the phase wire is white and the neutral wire is blue.
For convenience, the connection diagram of the single-phase meter model Mercury 201 is duplicated on the inside of the terminal cover. If the device is connected correctly, the red indicator light on it lights up.
Before closing the cover it is necessary to check the correctness of connection, paying attention to the tightness of connections: when tightening the terminals the insulation must not get under the contact. If this happens, it may gradually melt when the meter is under load.
The cover should be screwed tightly to the enclosure, leaving no gaps.
For reliable and safe operation of the meter Mercury 201, it is recommended to connect through circuit breakers with the use of RCD - protective cut-out device. It should also be installed in the switchboard. To avoid problems with the operation of the cross section of the wires must match the rated current of the meter. You should also pay attention to compliance with the power and diameter.
Before you install the meter, it is necessary to check its compliance with the requirements of regulatory documents. In the passport should be specified:
- accuracy class;
- dates of manufacture and verification;
- the number of entry in the State Register of Measuring Instruments.
It is necessary to check the availability of warranty seal and hologram, confirming the authenticity of the device.
If you carefully study the diagram, follow the sequence of operations, safety rules, you can perform the installation of the electricity meter Mercury 201 with your own hands. Then call an employee of the power company to check the correctness of the connection and sealing of the device. The peculiarity of this process is that the holes for sealing are too small and it is difficult to get the wire into them. A fishing line is not suitable for this purpose, so only wire seals are used.
You should pay attention to the date. On Mercury 201 model meters, as well as on other control devices and devices, install seals with the stamp of the state verification no older than 2 years. The disadvantage of the device design is the difficulty to visually check the seal, because it is located under the cover of the terminal block. There are also difficulties in using sticker seals. This is hindered by an inappropriately positioned fastening screw.
There are several display options for the Mercury 201 meter, depending on the design of the device. There are more displays on the LCD screen and they are more informative. In addition to the data on the used electricity, the date, current and voltage values, and operating time since commissioning are displayed.
Before taking readings with the Mercury 201 with drum-type counting system, you should remember that only whole data are taken from the power supply company. There are 6 drums on the device, 5 of which show whole values (they are black and located on the left) and 1 - tenths (it is black and located on the extreme right). This is done for visual convenience when taking readings.
Verification of the instrument is performed at the factory immediately after assembly. The fact of verification is noted in the passport and on the seal. The next period of verification of the meter model Mercury 201 - after 16 years.
