Fox Thermal Instruments FT1 Specifications

Model FT1 Gas Mass Flow Meter

Model

Thermal Mass
Flow Meter &
Temperature
Transmitter

Precision Mass Flow Measurement

An ON

I

CON Brand

For Industrial & Wastewater
Applications

• 2nd Generation DDC-Sensor™:
Robust, non-cantilevered design

• Gas-SelectX®: menu of field
selectable gas compositions

• CAL-V™ Calibration Validation

• Insertion and Inline styles

• Measures gas flow rate in SCFM,
MSCFD, KG/HR, & many more

• Wide measurement range: up to
1000:1 turndown; 100:1 typical

• 4-20mA for flow rate or temperature;
HART communication option

• Choice of second output: pulse
output for flow/total, Modbus RTU
(RS485), or BACnet MS/TP (RS485)

• USB port to connect to a PC, standard

• Free FT1 View™ Software available

• Welded, 316 SS sensor and flow body
construction, carbon steel flow body
optional

• Microprocessor based, field­programmable electronics

• Optional on-board 2 line x 16
character, backlit display with
configuration panel

• NIST traceable calibration

• Low-end sensitivity for leak detection

• Negligible pressure drop

• FM (U.S.) & FMc (CANADA) approved
for Class I, Div 1; ATEX/IECEx
approved for Zone 1

• NEMA 4X and CE Mark

• 2015 Flow Control Innovation Award
Winner

• Processing’s 2015 Breakthrough
Product Award Winner

FOX THERMAL

399 RESERVATION ROAD
MARINA, CA 93933
PHONE: [phone]
FAX: [phone]
[e-mail]
www.foxthermal.com

F T 1

Innovation

2015

Innovation

2015

WINNER

WINNER

DDC-Sensor™ Technology

The Fox Thermal DDC-Sensor™ is a state-of-the-art sensor technology
used in the Fox Thermal Model FT1 Thermal Gas Flow Meter. The
DDC-Sensor™, a Direct Digitally Controlled sensor, is unlike other
thermal flow sensors available on the market. Instead of using
traditional analog circuitry, the DDC-Sensor™ is interfaced directly to
the FT1 microprocessor for more speed and programmability. The
DDC-Sensor™ accurately responds to changes in process variables
(gas flow rate, pressure, and temperature) to determine mass flow rate,
totalized flow, and temperature.

Fox Thermal’s DDC-Sensor™ provides a technology platform for
calculating accurate gas correlations. The FT1 correlation algorithms
allow the meter to be calibrated on a single gas in the factory while
providing the user the ability to select other gases in the Gas-SelectX®
menu. With its DDC-Sensor™ and advanced correlation algorithm, the
FT1 is a precision, multi-gas-capable thermal gas flow meter.

Gas-SelectX® Gas Selection Menu

Process Engineers need a fast solution to their monitoring needs. For
these cases, Fox Thermal has developed the Gas-SelectX® gas menu
feature for the Model FT1 flow meter. Gas-SelectX® allows the user
to choose from a menu of several common gases or gas mixtures for
their application. Available gases: Air, Argon, Butane, Carbon Dioxide,
Ethane, Methane, Natural Gas (NAESB composition), Nitrogen, Oxygen,
Helium, Hydrogen, Propane, & gas mix (any five gases in this list to
create a custom gas composition totalling 100%).

The meter’s proprietary algorithms allow the user to switch gases
or gas mixes in the field, as needed. This makes the FT1 ideal for
measurement of Digester Gas, Liquefied Petroleum Gas (LPG) and a
variety of other biogases. Whether you need to measure natural gas or
air, CO2 or digester gas, the FT1 brings these options and more to the
user with a push of a button.

THERMAL MASS TECHNOLOGY

Fast and Flexible Gas Flow
Measurement

The Model FT1 thermal mass flow meter and temperature
transmitter can be used in a large variety of industrial and
commercial gas flow measurement applications. The FT1
offers the flexibility to monitor multiple gas types at the
push of a button, rotate the housing as needed for tight
installations, and configure meter settings from advanced
software.

Theory of Operation

Fox Thermal flow meters use a constant temperature

differential (constant Δ T) technology to measure the mass

flow rate of gases. The thermal mass flow sensor consists
of 2 Resistance Temperature Detectors (RTD’s).

The Reference RTD measures the gas temperature.
Meanwhile, the instrument electronics heat the mass flow
sensor, or heated element, to a constant temperature

differential (constant Δ T) above the gas temperature and

measures the cooling effect of the gas flow. The electrical
power required to maintain a constant temperature
differential is directly proportional to the mass flow rate of
the gas.

The Model FT1 flow meter and temperature transmitter is
approved for FM/FMc Class I, Division 1, ATEX/IECEx Zone 1.
CE Mark.

MODEL FT1

Fox Thermal Model FT1 Thermal Gas
Mass Flow Meter Features

The Fox Thermal Model FT1 measures gas ow rate in

standard units without the need for temperature or
pressure compensation. It provides an isolated 4-20mA
output (with a HART option) and a selection of pulse,
Modbus RTU (RS485), or BACnet MS/TP (RS485) for a
second output.

With an optional on-board 2-line x 16-character backlit

display, operators can view ow rate, total, elapsed time,

process gas temperature, and alarms. The display is also

used in conjunction with the Conguration Panel to access
ow meter settings, such as 4-20mA and pulse output
scaling, pipe diameter, zero ow cutoff, ow ltering

(damping), display options, and high or low alarm limits.

The Model FT1 is available in insertion and inline styles.
The insertion style FT1 has a robust stainless steel
probe and is easily installed by drilling a hole in the

pipe and welding on a 1” NPT coupling. A Fox Thermal-

supplied compression tting secures the probe in place.

It is supplied with 316 stainless steel wetted materials
standard. Inline styles of the FT1 are available in both

stainless steel and carbon steel with NPT and 150lb ange
options. See Specication section for details on sizing. A

USB port to connect to a computer or laptop is standard;
interface options include HART, Modbus RTU (RS485) and
BACnet MS/TP (RS485).

Fox Thermal has certied cleaning and bagging
procedures for ow meters to be used in oxygen

applications.

Advanced Features

Suitable for harsh and hazardous environments, the
instrument features:

• Robust DDC-Sensor™ Design

• Gas-SelectX® with a selection of pure gases or a
gas mix up to five gases

• CAL-V™ Calibration Validation

• Rotatable probe: allows ±180 degree swivel

• FM/FMc, ATEX, IECEx approvals. CE mark.

• 10-30VDC power input, standard

• NIST-traceable calibration

• Free FT1 View™ Software

• High and low alarm limits

• Wetted materials are all welded, 316 stainless steel

The DDC-Sensor™ allows the user to swivel the probe ±180°
into four positions.

Perfect for commercial and industrial applications, the
Model FT1 is a superior flow measurement instrument

with excellent accuracy!