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Installation & Operation Manual
Introduction
The Badger Meter Series 340 BN/MB Btu transmitter is an economical, compact device for hydronic sub-metering applications.
It utilizes an RS-485 connection for Modbus® and BACnet™ communication protocols and a solid state switch for pulse output
representing either flow or energy.
The Series 340 BN/MB calculates thermal energy by integrating the liquid flow in a closed pipe system and the differential
temperature between the supply and return. The Series 340 BN/MB requires one flow sensor and two temperature sensors.
The temperature sensors can be two-wire 10 kΩ Type II Thermistors or 100 or 1000 Ohm RTDs that follow the IEC 751 curve.
The flow input may be provided by many of the Badger Meter line of flow sensors and other manufacturers' devices that
generate pulses or sine waves.
The onboard microprocessor and digital circuitry make precise measurements and produce accurate drift-free output. The
Series 340 BN/MB is programmed using the Badger Meter Windows® software and a Badger Meter Model A301 programming
cable. Calibration information for the flow sensor, units of measurement, communication protocol settings, and output
scaling may be downloaded prior to installation or in the field.
The RS-485 Modbus settings include Baud Rate, Address and RTU/ASCII.
The RS-485 BACnet is a MS/TP Slave device and includes address, Baud Rate, DeviceName, Device Instance Number and Max
Master Valve.
While the unit is connected to a PC or laptop computer real-time flow rate, flow total, both temperature readings, energy rate,
and energy total are available.
The Series 340 BN/MB transmitter features three LED’s to indicate flow sensor activity, RS-485 activity, and the pulse output.
The Series 340 BN/MB transmitter has an isolated solid state switch closure that is user programmed for units of energy or
flow. The output pulse width is adjustable from 10 mS to 5 sec.
The Series 340 BN/MB Btu transmitter operates on AC or DC power supplies ranging from 12 to 24 volts.
The compact cast epoxy body measures 3.65”(93mm) x 2.95”(75mm) and can be easily mounted on panels, DIN rails or
enclosures.
Installation
Mechanical installation
The Series 340 BN/MB transmitter may be surface mounted onto a panel, attached to DIN rails using adapter clips or wall
mounted using two optional enclosures.
Location
Although the Series 340 BN/MB device is encapsulated, all wiring connections are made to exposed terminals. The unit
should be protected from weather and moisture in accordance with electrical codes and standard trade practices.
In any mounting arrangement, the primary concerns are ease of wiring and attachment of the programming cable.
The unit generates very little heat so not consideration need be given to cooling or ventilation.