COSA Xentaur HDT Data sheet

Loop-powered
Hybrid Dewpoint Transmitter

MODEL HDT

-76°F to 86°F (-60°C to 30° C) (dp)

For Compressed Air and Refrigerant Dryer Applications

• Rugged, Waterproof,
HTF™ Aluminum Oxide Sensor Technology

• Loop-powered (2-wire)

• Analog (4-20 mA) Output

• Digital (HART Compliant) Output

HTF™ High Capacitance Aluminum Oxide Sensor

The HDT uses a Xentaur Hyper-Thin-Film (HTF™) high
capacitance aluminum oxide sensor with a measuring range
of -76°F to 86°F (-60°C to +30°C) (dp). HTF™ sensors pro­vide a degree of accuracy, speed of response and stability
unavailable from instruments using conventional aluminum
oxide or polymer sensors.

Sensor model XTR-60 is designed to work in tough, high
pressure and even in liquid applications. The sensor is non­affected by condensation and water slugs; once dried, it will
resume measurement without requiring recalibration.

HART-compliant, IP66/NEMA4X Transmitter

The model HDT is a HART compliant IP66/NEMA4X hybrid
dewpoint transmitter, providing loop powered analog as
well as a digital output. Housed in a 1.25”dia. stainless
steel case it has an overall length of 5.68”, including the
standard industrial 9.4mm 4 pin connector. This makes the
HDT the world's smallest dewpoint transmitter.

• Programmable Alarm Signal

• NEMA 4X IP66 Stainless Steel Enclosure

• Compact Design

• Temperature Compensated Calibration

• Suitable for installations at pressure or ambient

the 4-20mA loop line. The interface is defined by HART. In
the digital mode the HDT can be remotely operated and the
dewpoint as well as temperature (and pressure if installed)
can be read. In the digital mode multiple units can operate
on the same loop cable as a multi-channel instrument. In
this configuration each HDT draws only 4mA independent
of the measured dewpoint

Built-in Alarm

The HDT provides a factory programmable dewpoint alarm
signal through a digital output pin. Additionally, relays or
external devices can be operated through the analog or
digital loops.

Connections

The HDT has two different thread types, which makes the
upgrade of existing installations easy. The HDT connects
through inexpensive two-conductor cables over long
distances.

Analog Output Loop

The instrument draws 4-20mA from the power supply.
The 4-20mA is linear to °C(dp) with an output resolution of

0.1°C(dp) or 0.25uA, whichever is greater. The output range
is programmable.

Digital Output Loop

The instrument can supply a digital output by modulating

Measurement Accuracy/Stability

The HDT transmitter uses a multipoint calibration table
which provides temperature compensated dewpoint read­ings for temperatures from +14°F to +158°F (-10°C to
+70°C) (t). Thus, the HDT provides accurate dewpoint mea­surements over its full range even under extreme tempera­ture conditions, such as when installed outdoors or close
to heat sources.

Typical sample system for
measuring atmospheric pressure

Typical sample system for
measuring line pressure

Specifications of HDT

The HDT is a loop powered HART enabled dewpoint transmitter.

Enclosure: ............................Stainless Steel, IP66 NEMA 4X.

Dimensions & Weight: ........... ~1.25”Dia. x ~5.68” long including sensor &

Pressure operating range: ...Standard: 500 PSI (34 bar). Optional: 5,000 PSI

Operating Temperature: .......14°F to 158°F (-10°C to +70°C).

Mechanical connection: .......14mm x 1.25mm threads, and 3/4”-16 threads.

Electrical connections: .........Industrial Standard 9.4 mm, 4 pin connector. IP66

Cable: ...................................Two conductor cable. Min. #24AWG; for total

Power Requirements: ..........5 to 28 VDC, the instrument draws 4-20mA

Input resolution: ...................0.1°C dewpoint.

Indicators: ............................None.

Engineering units: ................°C(dp), °C(t).

Controls: ...............................HART interface, user’s selections are stored in

connector; 0.5 lbs.

(340 bar).

NEMA 4X

cable length >5000ft.: min. #20AWG (Cable
must be shielded to meet CE requirements.)

depending on measured dewpoint.

EEPROM.

Specifications of HTF™ Dewpoint Sensor Element XTR-60

Type ............................................ Hyper-Thin-Film (HTF™) high capacitance

Dewpoint range ........................... -76°F to 86°F (-60°C to +30°C)

Capacitance: ............................... 15nF to 200nF

Accuracy: .................................... ±5.5°F (±3°C)

Al2O

3

Digital display panel meter provides power and display;
relays are optional.

Outputs: .........Analog and digital outputs are available.

A. 4-20mA drawn by the instrument from the power supply.

The 4-20mA is linear to °C(dp), the range is programmable.
Output resolution is 0.1°C(dp) or ~ 0.25uA whichever is
greater.

B. The instrument can supply digital output by modulating the

4-20mA loop line. The interface is defined by HART. In the
digital mode the HDT can be remotely operated and the
dewpoint as well as temperature (and pressure if installed)
can be read. In the digital mode multiple units can operate
on the same loop cable as a multi-channel instrument. In
this configuration each HDT draws only 4mA independent
of the measured dewpoint

Alarms: ............ The 4-20mA signal may be used by an external device to

operate relays. In addition, a digital output pin is provided which
can be factory (or specially equipped customer) programmed to
provide dewpoint alarm indications.

Isolation: .......... Sensor and case are referenced to the current loop negative

side.

Warranty: .........1 year

Repeatability: .............................. ±0.9°F(±0.5°C)

Temperature Range: .................... +14°F to +158°F (-10°C to +70°C)

Sample flow range:

(linear vel. @ 1atm): .............Static to 100 m/s

Storage temperature: .................. -40°F to +176°F (-40°C to +80°C)

Calibration method: ..................... Multipoint calibration table with temperature

compensation over the full range

Dimensions

COSA INSTRUMENT CORPORATION

Texas Office: 7125 North Loop East, Houston, TX 77028
Tel: [phone], Fax: [phone]

New Jersey Office: 55 Oak Street, Norwood, NJ 07648
Tel: [phone], Fax: [phone]

email: [e-mail]
www.cosa-instrument.com

REPRESENTED BY:

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