Edgetech Instruments DPS Specifications

ISO 9001:2008 Registered

ISO/IEC 17025:2005 Accredited

The Edgetech Instruments, Inc. DPS Series

consists of heated, primary method, chilled
mirror hygrometer systems that continuously
measure the dew point of high dew/frost point
gases from high temperature environments.

When the dew/frost point temperature of a sampled gas is
equal to or higher than the temperature of the sensing
system, saturation occurs in the sensing system causing

liquid water to condense in the apparatus. Under these

conditions, reliable dew/frost point measurement us not
possible.

The DPS Series heated hygrometers solve this problem by
heating all the components of the sensing system to a
temperature above the dew/frost point temperature of the
sampled gas, preventing condensation in the measurement
system. The entire sampling system within the DPS,
including the chilled mirror sensor, is heated. The heated
sensor and system allow reliable, accurate measurement of
high dew/frost point temperatures that are above the
ambient temperature.

The DPS heated chilled mirror hygrometer extracts a gas
sample from a high temperature, high dew point process,
transports it through a heated hose and measures its dew/
frost point over the range of -35°C (-31°F) to as high as
+95°C (203°F) dew/frost point temperature. The three

models are the DPS3 standard unit, the DPS4 featuring the

ability to measure and automatically compensate for
pressure and the DPS5 deluxe unit that offers an advanced
display, operational software and interface options. For
details see the DPS Series application note on the
Edgetech Instruments website.

All Edgetech Instruments hygrometers are manufactured,
calibrated and supported in the USA in a modern,
ISO 9001:2008 registered facility containing Edgetech
Instruments’ ISO/IEC 17025:2005 accredited calibration
laboratory. All certifications and calibrations are traceable
to NIST.

Benefits:

• Allows measurement of dew/frost point temperature that is
above ambient temperature

• Primary method sensor provides absolute knowledge of dew/

frost point temperature

• Prevents measurement system failures

• Improves process control with accurate knowledge of dew/frost

point temperature

• Reduces down-time and maintenance frequency

Heated Dew/Frost Point Hygrometer System

Features:

• Automatic Balance Control mode provides
automatic correction for optics contaminants

• User programmable system temperature

controller

• Current or voltage outputs, RS-232 available

• User programmable alarm functions

Applications:

• Wood veneer drying

• Combustion processes

• On-engine test

• Leakage testing of nuclear reactors

• Fluidized bed dryers

• Product drying chambers

• Bakeries

• Exothermic process chambers

• Fuel cell testing

• Furnace applications

• Pharmaceutical powder drying

• Elevated temp process chambers

• Plastics molding processes

• Chemical reactors

• Heat treating and annealing ovens

• Nuclear process monitoring

Toll Free: 800-279-3729 Ph: 508-263-5900 Fax: [phone]

E-mail: [e-mail]

Web: www.edgetechinstruments.com

Technical Specifications

ISO 9001:2008 Registered

ISO/IEC 17025:2005 Accredited

Specifications:

Primary method chilled mirror sensors:

DPS3 available with the HTS2 two stage chilled

mirror or HTS3 three stage chilled mirror

DPS4 and DPS5 available with HTS2 two stage

chilled mirror or HTS3 three stage chilled mirror

with standard aluminum body or the HTX3

stainless steel body

Heated system temperature range:

20 to 99°C (68 to 210°F)

Dew/frost point measurement range:

-35 to 95°C (-31 to 203°F)

Measurement accuracy:

±0.2°C (±0.4°F)

Repeatability:

±0.05°C (0.9°F)

User programmable temperature controller:

Standard

Display parameters:

Dew/frost point temperature, system set point

temperature, system actual temperature

Two alarm relays:

Standard

Analog Outputs:

Selectable 4 to 20mA, 0 to 5 V dc or 0 to 10 V dc

Serial RS232 output:
Standard
Sample Connection:

¼ inch compression fitting

Sample Pressure:

0 to 200 psig

Heated sample hose:

3 ft. included

AC power:

100 or 240 V ac, 50/60Hz, 250 Watts, specify

voltage

Mirror material:

Standard: chrome
Optional: stainless steel or platinum

Sample Flow:

0.5 to 5.0 SCFH (0.25 to 2.5 l/min)
Automatic Balance Control standard
Integral adjustable sample flowmeter

Options:

Pressure transducer kit, live pressure for ppmv

output

Sample flow detection, sample flow switch with

SPST dry contacts

Sample flow detection, sample flow switch triggers

red lamp alarm

Vacuum pump to extract sample flow from process

to the sensor

Cart mount, specify model analyzer
Extended length sample hose, 10 ft.