Edgetech Instruments DewTrak-II-MO Specifications

ISO/IEC 17025:2005 Accredited

ISO 9001:2015 Registered

The DewTrak II-MO is specifically designed to measure

conditions required for Motor Octane Number
(MON) and Research Octane Number (RON). It
uses the primary method chilled mirror dew/
frost point temperature condensation principle
to determine the water vapor concentration and
a pressure sensor to measure barometric

pressure of the motor intake air/fuel mixture.

The DewTrak II chilled mirror hygrometer has been adapted

for motor octane testing per ASTM Standards D2699,
D2700 and D2885, where the water vapor content in grains/
lb. of dry air is measured and controlled so an accurate
determination of octane rating of fuels can be made.

Chilled mirror hygrometry is an excellent technology for this

application due to its NIST traceability, inherent stability and
repeatability. To make the system compliant with ASTM
Standards, the DewTrak II-MO also features a se n so r th a t
contin uous l y measur es the barometric pressure in inches
of mercury.

The DewT rak II-MO hygrometer probe is inserted into a
specially designed, robust metal manifold that fits onto the
engine air intake duct. The probe forms an air tight seal with
the duct. The manifold has been designed so just a minimal
amount of the probe is in the airflow. It does not change any
aspect of air delivery to the engine. Each manifold is fitted
with a removable, air tight plug so individual probes can be
shuttled between engine test stands for optimum versatility of
measurement. Probes can also be remotely mounted.

All Edgetech Instruments water content analyzers are
manufactured and supported in the USA in a modern, ISO
9001:2015 registered facility with ISO/IEC 17025:2005
accredited calibration laboratory. The DewTrak II-MO is
delivered with a NIST traceability certificate.

Water Vapor & Barometric Pressure Measurement

for Motor Octane Testing

Features:

• Primary method chilled mirror measurement
of dew/frost point

• ±0.5 gr/lb. water content accuracy

• ± 0.044 inches of Hg barometric pressure

accuracy

• Long term stability and repeatability

• Electronics housed in IP65 enclosure

• Manifold mount assembly kit included

Options:

• Data logging

• Spare manifold plug

• Remotely mounted sensor

Applications:

• MON analysis

• RON analysis

• Fuel and emissions testing in combustion

engines

The DewTrak II-MO System is Available in Two
Versions, for Duct or Remote Sensor Mounting

The DewTrak II-MO Manifold Mount

Toll Free: 800-276-3729 Ph: 978-310-7760 Fax: [phone]

E-mail: [e-mail]

Web: www.edgetechinstruments.com

Technical Specifications

ISO/IEC 17025:2005 Accredited

ISO 9001:2015 Registered

Sensor Types:

Primary method chilled mirror dew/frost
point sensor with two stage thermoelectric
cooling

Barometric pressure sensor

Mirror:

Standard: chrome plated

Measurement Range:

Water content:

0.56 gr/lb. to 1070 gr/lb.
Barometric Pressure:
0 to 30 in of Hg

Depression:

60°C

Accuracy:

Water content:
± 0.5 gr/lb.
Barometric pressure:
± 0.044 in of Hg

Repeatability:

±0.1 gr/lb.

Response:

2.7 gr/lb./sec not including settling time

Hysteresis:

Negligible

Display Parameters:

Dew/frost point, pressure, grains/pound

Rev. v7

Flow Rate:

Static to 3,000 linear ft./min.

Operating Pressure:

Standard: 100 psig maximum
Higher pressure available on special order

Analog Outputs:

2 analog outputs:
4 to 20 mA or 0-5 Vdc to 0-10 Vdc selectable

Load:

4 to 20 mA: 0 to 250 ohms
0 to 5/10 Vdc: 1 K ohm or higher

Serial Output:

RS232 bi-directional

Relay Outputs:

2 programmable alarm relays:
K1: Clean mirror/Alarm 1
K2: Servolock/Alarm 2

Contact Rating:

Normally open (NO):
3 A at 25 Vac, or 30 Vdc

Remote Cable Configuration:

0 ft. standard, 50 ft. maximum

Power Supply:

24 Vdc ± 20%, 1 A maximum

Enclosure:

Plastic IP65 rated

Weight:

3 lbs. or 1.4 kg

DewTrak II-MO Remotely Mounted Probe