ARAD TECHNOLOGIES LR9 Digital Water Meter User Guide
- June 6, 2024
- ARAD TECHNOLOGIES
Table of Contents
ARAD TECHNOLOGIES LR9 Digital Water Meter
Introduction
The Allegro IOT – Interpreter LR9 is a battery-operated radio module for an
automated water meter reading. This module is capable of reading water
consumption data from residential and commercial water meters.
It has a 2-way radio that is compatible with Allegro IOT modules family, GW’s
for
relaying water consumption data to the utility. It also has a single channel
mode for short-distance communication to the VTR tech tool in the field.
Electrical Characteristics
- Battery:
- Battery type: Lithium-Thionyl Chloride
- Nominal voltage: 3.6 V
- Capacity: 8500 mAh
- DC Characteristics:
- Operating voltage range: 3.0 V – 3.6 V
- Typical Sleep Current: 12 uA
- Radio Characteristics:
- Typical Antenna Gain: 0dBi
- Frequency Range: 902 – 928MHz
- Modulation Format: CSS
- Transmit Power up to 20dBm (100mW)
- Receive Sensitivity up to -140dBm
Functional Description
The Allegro IOT – Interpreter LR9 is a wireless battery endpoint for the application of automatic water meter reading. The primary function of the module is to record magnetic field reversals that are converted to a measurement of water consumption volume and then deliver the data to the utility for processing. The diagram below demonstrates this operation.
The radio has two operating modes, a chirp spread spectrum (CSS) and a single
channel. The CSS is the normal operating mode for network communication. The
single-channel mode is primarily used for field diagnostic purposes.
When installed, the module automatically utilizes the CSS mode to operate as
part of a LoRaWAN network. The module will remain in this mode unless a
service event is initiated from the field tool. In this case, the radio
changes to the single-channel mode for the duration of the service session.
The module returns to the CSS mode when the service session is closed.
The user does not have the ability to change modes other than using the field
tool.
FCC
CAUTION
The User and the Installer should be aware that changes and modifications to
the equipment not expressly approved by Master Meter could void the warranty
and the user’s authority to operate the equipment.
Professionally trained personnel should install the equipment.
The antenna used for this transmitter must be installed to normally provide a
minimum separation distance of at least 20 cm from all persons and must not be
co-located or operating in conjunction with any other antenna or transmitter.
This device complies with Part 15 of FCC Rules. Operation is subject to the
following two conditions:
- This device may not cause harmful interference, and
- This device must accept any interference received, including interference that may cause undesired operation.
Industry Canada (IC) Compliance Notice
This device complies with Industry Canada license-exempt RSS standard(s).
Operation is subject to the following two conditions:
- this device may not cause interference, and
- this device must accept any interference, including interference that may cause undesired operation of the device.