GREYSTONE HAS AN ISO 9001 REGISTERED QUALITY SYSTEM

FLEX-DUCT AVERAGE NETWORK TEMPERATURE SENSOR

TNDF SERIES

PRODUCT DESCRIPTION

The flexible, multi point duct average network

temperature sensor incorporates numerous

precision sensors at equal distances across the

FT-6 plenum rated cable and is available in various

lengths. All probes provide excellent heat transfer,

fast response and resist moisture penetration. The

transmitter provides a BACnet® or Modbus signal

for network connection. A compact ABS enclosure

with a hinged and gasketed cover is provided for

ease of installation.

TYPICAL INSTALLATION

For complete installation and wiring details,

please refer to the product installation

instructions.

The flex-duct average probes are installed through

a hole in the side of the duct to monitor an average

temperature within the duct. Select a probe length

that allows for criss-crossing the duct multiple

times. Install the probes in a straight section of

duct at a suitable distance downstream from any

heating, cooling, or humidification devices. The

cable probe needs to be fastened onto hangers

using tube clamps or wire ties and should be

secured every 100 cm or 3’ maximum to prevent

movement of the wire and prevent wear. If

sensor is to be used in high velocity or vibration

environment use of rigid style duct probe is

recommended.

The enclosure provides mounting tabs for ease of

installation.

NOTE: This product is factory calibrated and any field adjustment will void the warranty.

POWER SUPPLY

BACnet®: 24 Vac/dc ±10% (non-isolated half-wave rectified)

Modbus: 24 Vac/dc ±20% (non-isolated half-wave rectified)

CONSUMPTION

BACnet®: 25 mA max @ 24 Vdc

Modbus: 10 mA max @ 24 Vdc

OUTPUT SIGNAL

MS/TP 2-wire RS-485 (BACnet® or Modbus)

OPERATING ENVIRONMENT

-40 to 50°C (-40 to 122°F), 5 to 95 %RH non-condensing

STANDARD LENGTHS

1800mm, 3600mm, 6100mm, 7300mm (6’, 12’, 20’, 24’)

PROBE SENSING RANGE

-20 to 60

°C (-4 to 140°F)

WIRE MATERIAL

FT-6 plenum rated cable, 22 AWG

WIRING CONNECTIONS

Screw terminal block (14 to 22 AWG)

ENCLOSURE

A: ABS, UL94-V0, IP65 (NEMA 4X)

E: Same as A, with thread adapter (1/2” NPT to M16) and cable gland fitting

COUNTRY OF ORIGIN

Canada

TEMPERATURE

Sensing Element: NTC thermistor

Accuracy: ±0.2°C (±0.36°F) @ 0 to 70°C (32 to 158°F)

Resolution: 0.1°C/°F

BACnet® COMMUNICATIONS INTERFACE

Hardware: 2 wire RS-485

Software: Native BACnet® MS/TP protocol

Baud Rate: 9600, 19200, 38400, 57600, 76800, or 115200 (auto-detect)

Network Address Range: Locally set to 0-127

Serial Configuration: 8N1

MODBUS COMMUNICATIONS INTERFACE Hardware: 2 wire RS-485

Software: Native Modbus MS/TP protocol (RTU)

Baud Rate: 9600, 19200, 38400, 57600, 76800, or 115200 (auto-detect)

Network Address Range: Locally set to 1-255 (switch selectable)

Parity: None

Stop Bits: 1

Error Checking: A001 (CRC-16 reverse)

INPUT VOLTAGE EFFECT

Negligible over specified operating range

PROTECTION CIRCUITRY

Reverse voltage protected and transient protected.

SPECIFICATIONS

82.5 mm

3.25"

69.8 mm

2.75"

52.0 mm

2.05"

76.2 mm

3.00"

0.5” NPT

Foam Gasket

304 Series S/S Probe

Various Probe Lengths

See Ordering Chart

FT-6 Plenum Rated Cable

CABLE GLAND FITTING

THREAD ADAPTER 1/2” NPT TO M16

ACCESSORIES - INCLUDED WITH E ENCLOSURE OPTION