Badger Meter 340N2 User Manual

Badger® Series 340N2

METASYS® Compatible

Energy Transmitter

Installation &

Operation Manual

BadgerMeter, Inc.

872033

Rev. 6

4-09

IntroductIon

The Badger Meter Series 340N2 Btu transmitter is an economical, compact device for sub-metering applications using Johnson Controls Metasys® Network Companion™ and Facilitator™ Supervisory Systems.

The Badger® Series 340N2 works in conjunction with a

ow sensor and two temperature sensors to calculate thermal energy by measuring liquid ow and inlet and outlet

temperatures in a closed pipe system. The Series 340N2 requires two 10 kW thermistors for temperature input. The ow input may be provided by any Badger Meter sensor and many

other pulse or sine wave signal ow sensors.

The onboard microcontroller and digital circuitry make precise measurements and produce accurate, drift-free outputs. The

Series 340N2 is congured using Badger Meter Windows

based programming software. Calibration information for the

ow sensor, units of measurement and output scaling may be preselected or entered in the eld. Btu transmitter information

is available when connected to a PC or laptop computer. This

information includes real-time ow rate, ow total, both T1 and

T2 temperature probe information, energy rate, and energy total.

The Series 340N2 transmitter features two LED’s to verify input and output signals.

The primary output for the Series 340N2 is an isolated solid state switch closure that is user programmed for units of energy

or ow. The output pulse width is adjustable from 50 mS to 5

sec.

Surface Mount Installation

The Series 340N2 may be mounted to the surface of any panel using double-sided adhesive tape or by attaching fasteners

through the holes in the mounting anges of the unit.

din rail Mounting

Optional clips snap onto the mounting anges allowing the Series 340N2 to be attached to DIN 15, 32, 35 mm DIN rail

systems.

Wall Mounting

Optional metal and plastic enclosures are available for the

Series 340N2. The enclosure is rst attached to the wall using

fasteners through its mounting holes. After wiring, the transmitter may be attached to the enclosure

with the terminal headers facing in using the slots in the Series

mounting anges. As an alternate mounting arrangement, the

340N2 may be fastened to the box cover using double-sided adhesive tape.

temperature Sensor Installation

The location of the temperature sensors with regard to the ow

sensor is important to the accuracy of the energy calculation.

temperature sensor t1 must be located closest to the

ow sensor. A distance of 5 pipe diameters will give the

greatest accuracy. Always install the temperature sensor

downstream of the ow sensor.

The secondary output is the Johnson Controls N2 communications protocol that allows the Series 340N2 to be assigned an address and allow all measurement parameters:

inlet and outlet temperature, ow rate, ow total, energy rate and energy total to be transmitted from as many as 255 units on a single 3-wire RS-485 bus.

The Series 340N2 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 in panels, enclosures

or on DIN rails.

InStallatIon Mechanical Installation

The series 340N2 transmitter may be surface mounted onto a panel, attached to DIN rails using adapter clips or wall mounted using optional enclosures.

location

Although the Series 340N2 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 no consideration need be given to cooling or ventilation.

Series 340n2 dimensions

340n2 Metal Box dimensions

Sensor Wiring

All ow sensor types connect to the four terminal header labeled “Sensor Input”.

Series 200

Connect the red wire to Series 340N2 Sensor signal (+), connect the ow sensor black wire to Series 340N2 Sensor signal (-) and the bare wire to shield.

SdI Series (standard pulse output option)

Connect SDI number 3 sensor signal to the Series 340N2 transmitter sensor signal (+) and the SDI number 2 sensor common terminal to Series 340N2 transmitter sensor signal (-). Connect the shield terminal of the SDI sensor to the shield

terminal of the Series 340N2 transmitter.

other Sensors

The Sensor Input power out terminal supplies nominal 12VDC excitation voltage for 3 wire sensors. Connect sensor signal + and sensor signal - wires to transmitter terminals.

Note: The green input LED toggles on and off as sensor pulses

are received. With no ow input the LED will remain in its

last state (either on or off).

340n2 Plastic Box dimensions

Electrical Installation

All connections to the Series 340N2 are made to screw terminals on removable headers.

Power Supply Wiring

The Badger® Series 340N2 requires 12-24 Volts AC or DC to operate. The power connections are made to the header. The connections are labeled beside the header. Observe the polarity shown on the label.

If a Badger Meter plug in type power supply (Model A-1026 or A-503) is used, connect the black/white striped wire to the terminal marked positive (+) and the black wire to the terminal marked negative (-).

Note: Included with every Series 340N2 is a Model 340N2IK kit containing a screw, lockwasher and ground lead to connect the Series 340N2 to earth ground. Connect the earth ground lug of the Series 340N2 to a solid earth ground with as short a wire as possible. This will help prevent electrical interference from affecting the Series 340N2’s normal operation.

oranGE

Side View - Typical Series 300 Removable

connector Wiring

Sample Power Supply Wiring Diagram

N2+

N2-

REF

2 pmeT

1 pmeT

Model: 340N2

S/N 340N2- XXXX X

FER

-2N+

Mattapoisett, MA 0 273 9

11 22 33

Metasys

CPN, FAC, or NCM

T emp 2

T emp 1

10KΩ Thermistors

Sample Sensor Wiring diagram

temperature Element Wiring The Badger Meter thermistors are not polarity sensitive.

Connect the thermistor closest to the ow sensor to the Series

340N2 terminal block marked Temp 1 number 3 and number

2. The other thermistor wires to Series 340N2 terminal marked Temp 2 number 3 and number 2.

Pulse output Wiring

The Badger® Series 340N2 has solid state switch output rated for a maximum sinking current of 100 mA @ 36 VDC. In

most cases the Series 340N2 pulse out (+) will connect to the unput pulse (+) and the Series 340N2 pulse out (-) terminal to the input pulse (-) of the receiving device. The separate two

terminal removable header on the Series 340N2 is labeled Output. Observe the electrical polarity of the output.

Note: When the solid state switch is closed the red output LED will turn on.

connecting the n2 Bus

Observe polarity when connecting the Series 340N2. Connect the N2+, N2- and Ref to the appropriate connections in the N2 network.

Note: The Series 340N2 default address must be changed before it is introduced into an existing network to avoid any pos-

sible address conicts. See programming instructions on

the following page.

Thermistor Wiring Diagram

Sample Pulse Output wiring Diagram

If the Series 340N2 is connected at the beginning or the end of the N2 network, jumpers W1 and W2 can be shorted for biasing and terminating of the network. The Series 340N2 biasing circuitry is shown in the diagram on the right.

Sample wiring to N2 Network

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