HRI MEI is an inductive sensor for remote reading and transmission of measurement values from water meter to data center to measurement collection The sensor is compatible with Armatec turbine sensor Meinstream of type AT 7110/7110A (cold water) and AT 7170 (warm water). The sensor is mounted on top of the meter's display panel.
HRI MEI is available in 2 different versions:
CE-marked
The product has performed the requirements for electromagnetic compatibility in accordance with EEC Directive 98/34, European Standard EN61000-6-1
The HRI-sensor inductively reads the number of rotations on the metal indicator located under the glass on the water meter's display board.
The sensor has a built-in battery for up to 12 years of operation. Measuring value and settings are maintained in case of power failure (e.g interference with the M-bus loop). In case of power failure, the data sensor (AT 7275MEI-B1 -....) will continue to register the values.
The data sensor is marked with a manufacturing number, which corresponds to the secondary print. For delivery, the primary print is set to 000 by default.
| Cable length: | 3 m (does not apply to the radio scanner) |
| Protection: | IP 68 (hermetically sealed) |
| Storage temperature: | -20 °C to +65 °C |
| Ambient temperature: | -10 °C to +65 °C |
| Battery: | Lithium. Life length 11 +1 år (stockholding) When connected to the M-bus loop, the life length can be extended. |
| Data interface | ||
| Type: | M-bus and Mini-bus | |
| Speed: | Automatic recognition, 300/2400 Baud | |
| Protocol: | According to IEC 870 / EN 1434-3 | |
| Data: | Measurement, meter number, backflow*, monthly metering* and min-max flow* | |
| Max cable lenght: | Acoording to M-bus specifications | |
| *The sensor can be programmed to transfer these values | ||
| Pulse output (I1, I2) enl. ISO/TC 30/SC 7/ WG 8 | ||
| Type: | Open Collector, transistor relay (potential dependent)* | |
| Input voltage: | max 48V DC | |
| Input current: | max 20 mA | |
| Length: | 32, 128 or 500ms (is delivered with 500ms as standard pulse length) | |
*To get a potential-free pulse, the AT 7281-2PCD must be mounted after the pulse sensor. * To get a different pulse length than 500 ms, clarify this when ordering | ||
| Pulse value (liter/pulse) | 10 | 50 | 100 | 250 | 500 | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Length (ms) | 32 | 128 | 500 | 32 | 128 | 500 | 32 | 128 | 500 | 32 | 128 | 500 | 32 | 128 | 500 | |||||||||||||||
| DN 40 | X | X | - | X | X | X | X | X | X | X | X | X | X | X | X | |||||||||||||||
| DN 50 | X | X | - | X | X | X | X | X | X | X | X | X | X | X | X | |||||||||||||||
| DN 65 | X | X | - | X | X | X | X | X | X | X | X | X | X | X | X | |||||||||||||||
| DN 80 | X | - | - | X | X | X | X | X | X | X | X | X | X | X | X | |||||||||||||||
| DN 100 | X | - | - | X | X | X | X | X | X | X | X | X | X | X | X | |||||||||||||||
| DN 125 | X | - | - | X | X | X | X | X | X | X | X | X | X | X | X | |||||||||||||||
| DN 150 | - | - | - | - | - | - | X | X | - | X | X | X | X | X | X | |||||||||||||||
| DN 40-100 can be supplied with Opto-OD sensor AT 7275-PDY1 for 1 liter per pulse. Amplifiers AT 7275-WE77-230V or AT 7275-WE77 are necessary to amplify the output of the transducer. | ||||||||||||||||||||||||||||||
- Sensors that are prepared for HRI has an indicator equipped with a metal plate. Before mounting the sensor, the transport foil on the underside of the sensor has to be removed.
- Assembly of the HRI-unit is done without the need to break any seals on the gauge, and this can be done either directly when the meter is mounted or afterwards when the meter has already been mounted. When retrofitting, the sensor should be programmed so that its calculator is in accordance with the meter.
- The HRI-MEI remote reader module is mounted on the counter by removing the blue door labeled OD on the side of the gauge, turning the counter counterclockwise, securing the module into the grooves and turning the work clockwise
- Signal-wires are selected according to the following wiring diagram, depending on the use of pulse or M-bus/Mini-bus. Usually, the following are used: Pulse: white (+) and gray (-). M-bus: green and brown (also see separate Operating instructions).
| Type | Art.no | Dimension (DN) |
|---|---|---|
| Pulse/data/M-bus/Mini-bus | AT 7275MEI-B1D100K1 | 40-125 |
| AT 7275MEI-B1D1000K2 | 150 | |
| For DN 200, choose AT 7109-200 with associated donors | ||
| Radio probe Scout | See product sheet AT 7087 | |
| Opto-sensors OD | AT 7275PDY1 with amplifier AT 7275-WE77 | 50 -100 |
