HRI (high resolution interface) is a universal sensor which is compatible with a wide range of meters, including single-jet, multi-jet and piston meters with dry-dial and semi-dry registers in glass-copper or plastic housing. HRI can be retrofitted on all Sensus meters since 2008 pre-equipped with an HRI modulator.
The HRI-A PulseUnit is a high resolution pulser which detects the flow direction.
The HRI-B DataUnit is an electronic register with a data interface which supports both hard-wired M-Bus systems and battery-driven MiniBus devices such as mobile meter reading systems. The HRI-B can alternatively be used as a pulse type with configurable pulse output.
The HRI is more than an extension of a simple sensor. It has been expanded to provide a reliable data source for remote reading of a conventional meter. It is the interface for all today’s requirements for data interrogation and remote transmission.
The HRI pickup system technology enables the load-free sensor detecting of the pointer‘s rotation of pre-equipped meters
HRI-A and HRI-B are using the same proven pick up principle.
HRI-A4 compensates reverse flow pulses with its balanced pulse output.
HRI-A3 is a special version for applications requiring a direction signal like external radio modules.
3V Lithium battery with expected lifetime 12 years.
max.: d x h - 66 mm x 32 mm
Additional height of the meter: 25.5 mm
Weight: 136 g
1.5 m - possible cable extension up to max.
30 m. Transient voltage protection is highly recommended for wiring outside buildings.
¹ Usable on hot water meters up to 90 °C water temperature e.g. Sensus 120C meter. A requirement for this application is that the pulser is in free air to ensure adequate cooling.
(only where direction signal is applicable)
Reverse volume pulses are compensated by identical number of forward pulses before continuing with output pulses.
A remote counter at the HRI-A4 will represent the identical counter reading as at the meter!
HRI-A4 provides a solid state switch
The HRI-A4 is available with following alternative output pulse weights: D = 1 or 10 or 100
HRI-A. But the HRI-B has a serial output and a pulse output which can be used alternatively. Parallel usage of serial output and pulse output is not recommended and can cause problems.
The serial interface can also be used to configure the pulse output.
2 pulse outputs (I1, I2) according to ISO / TC 30 / SC 7 / WG 8
Depending on the application, the HRI-B Pulse Outputs can be offered in three modes: Mode B2, B3 and B4.
Output l1: Forward flow pulses
Output l2: Reverse flow pulses
Output l1: Forward and reverse flow pulses
Output l2: Flow direction (open = forward)
Output l1: Balanced pulses 3
Output l2: Cable cut detection
Output l2 is permanently closed. If the cable is cut, it can be detected as open.
3 Reverse pulses are compensated by identical number of forward pulses. See HRI-A.