Sensus - High Resolution Interface - HRI-Mei for MeiStream & MeiTwin

The HRI-Mei is a data capture device for MeiStream and MeiTwin MID bulk water meters.

All MeiStream standard registers are prepared to receive the HRI-Mei. The HRI-Mei can also be mounted afterward without breaking the meter’s seal.

The HRI-Mei provides a high-resolution pulse output with water flow direction detection. Also, the data interface can be used for M-Bus applications.

With the HRI-Mei all known data interfaces with Encoder, Electronic, and Hybrid registers can be replaced. Depending on the register a second pulser like the Opto OD can be plugged in additionally e.g., at the MeiStream. Also, other applications requiring reed switches or optical pulse outputs can be supported with only this one data capture device

Features and Benefits

• Compatible with bulk water meters with MeiStream and MeiTwin MID standard register.
• Load-free inductive scanning of the meter’s pointer
• Retrofittable
• Detection of water flow direction
• Electronic pulse output means no switch bouncing.
• Pulse weight, mode, and length can be changed on-site.
• Self-diagnostic and tamper detection
• Battery lifetime up to 12 years. With external power supply i.e., the M-Bus central unit lifetime can be expanded.
• Sealed housing (IP68)
• Cable length 3m

Applications

• Meter reading is based on billing purposes i.e., mobile reading systems.
• Meter remote reading and profiling via cable fixed networks with M-Bus, radio modem, or GSM network.
• Industrial control applications with the FM-1D/K or FM-2D
• Data logging in conjunction with various data loggers, i.e. CDL.
• Logging and transfer of flow profiles e. g. when using Water box internet access.
• The robust design allows the use of the HRI-Mei in harsh environments like flooded pits.
  

Wiring Example

Pulse Output

Opto-OD (NAMUR) Compatible Mode

• Pulse mode: According to Opto-OD standard
• Programmable pulse weights: 10, 25, ..., 1000 liters/pulse
• Pulse length: 6 ms
• Standard: NAMUR, according to EN 60947-5-6
  

Reed-RD Compatible Mode

• Programmable pulse weights: 10, 25, ..., 10000 liters/pulse
• Pulse length options: 32 ms, 128 ms, or 500 ms
• Maximum voltage: 48 V DC
• Maximum current: 0.2 A
• Maximum switching capacity: 4 W

Transferred Data

• Meter index
• Fabrication number
• Meter ID (secondary address)
• Monthly meter index (programmable day)
• Yearly meter index (programmable key date and previous year)
• Minimum / maximum water flow with date and time
• Backward water volume with date and time
• Broken pipe and leakage detection (with programmable flow thresholds)
• Tamper detection (*)
• The HRI-Mei can be programmed to transfer selected information
  

Programmable Data

• All configurable data can be programmed using Minicom software
• Communication via M-Bus / Minibus interface
• Minicom software is available free on the Sensus website

(*) Tamper detection requires a tamper target on the meter

Pulse Modes

4 different pulse output modes available via 2 lines

Note: Parallel use of pulse and serial outputs is not recommended and may cause issues depending on the application

Mode B2

• I1: Forward pulses
• I2: Backward pulses
  

Mode B3

• I1: Forward and backward pulses
• I2: Flow direction signal (1)

(1) Ground level indicates reverse flow

Mode B4 (Default)

• I1: Balanced pulses (2)

(2) Backward pulses are compensated by suppressing equivalent forward pulses

• I2: Alarm output (3)

(3) Opens on alarm or cable cut (broken pipe, leakage, tampering, etc.)
Alarm is indicated by ground level at the output

Mode B5

• Opto-OD (NAMUR) pulse output (6 ms)
• I1: Pulses with flow direction code
• I2: Not used
  

Temperature Range

• Water temperature:
  
  • Cold water: up to 30 °C
  • Warm water: up to 50 °C
    
• Environmental temperature: -10 °C to +60 °C

Possible Pulse Values

Indication example

HRI-Mei B4 D10 / T500 / 50 °C

Mode Divider / Pulse length/max. Medium temperature

Divider (D) =Pulse output / Pointer (pick up)