The 202D loop driven Rate Totaliser makes the current converter an excellent voltage converter, especially for low-frequency positive displacement or turbine flow inputs. As 202D measures flow levels by measuring input pulse duration, a very consistent and accurate output of 4 to 20 mA can be achieved for low-frequency inputs.
202D Field Mounting Rate Totaliser Specifications
The 202D battery version is designed for applications without external power sources. Power comes from two lithium battery packs that provide enough energy for up to five years. Even at dangerous positions on the ground, the Led warning shows that the customer has a low battery power status and a system turn. The DC-powered system operates between 9 and 28 volts on an external power supply which consumes no more than 4mA. This means that the 202D can be worked with AC power adapters and reduces the need for field voltage. Lithium batteries offer protection while DC electricity is turned off. The 202D is fitted with a 10-point non-linear modification. Separate K-factor and frequency points can be built to resolve K-factor variations. Nonlinearity correction is only required if accurate measurements are appropriate and calibration certificates are usable.
Remember that this option raises the time taken to refresh the display to 1 second in battery-powered models. The 4-20mA output configuration draws power from the 4-20mA loop and includes lithium backup batteries when the 4-20mA loop is disrupted. The system shall include a retransmission of the 2-wire flow rate. The 4mA and 20mA points can be entirely programmed to span the whole continuum or a small area of the operating range. Two solid state relay outputs are available for both 4-20mA output models and DC powered variants. The system shall be fitted with a high and low flow rate or pulsed performance and a low flow rate warning. Outputs may be limited to 200mA and may be used by external relays, sound detectors or computer systems. Outputs are internally secured from voltage spikes caused by relays and spindles. All outputs are separately separated by an opto insulator. The switching points can be modified during the setup phase. The pulse can be either unscaled (raw pulse input) or scaled down when calibrated to the trigger source.