Edgetech Instruments RH-CAL Specifications

ISO/IEC 17025:2005 Accredited

ISO 9001:2015 Registered

The RH CAL is a micropr o cessor based,

pro g ram m a ble humidity calibration system
that is at home in the metrology lab or in the
field performing on-site, NIST traceable humidity
calibrations. The system offers the highest
accuracy available for both relative humidity
and temperature. Unlike other calibration

systems, RH CAL is entirely self-sufficient. It

does not need compressed air or a water
connection to operate, which allows the system
to be truly portable.

With the RH CAL, temperature and relative humidity are
controlled independently. The user is not limited to performing
calibrations at the surrounding ambient temperature, which
may not be appropriate for his unique calibration protocol.
Using Edgetech Instruments’ chilled mirror, primary method
dew/frost point measurement technique for traceability and
feedback control, RH CAL is a standalone, portable humidity
calibration system.

Contributing to RH CAL’s ease of use are features such as
maintenance-reducing Automatic Balance Control (ABC),
plus an integral temperature probe and a D2, primary
method chilled mirror sensor which are located in the sample
chamber, providing not only superior accuracy but the fastest
response.

The RH CAL employs a unique control scheme for maintaining
very precise RH control. The system incorporates volumetric
proportional control valves. By independently modulating the
dry and wet valves from full-open to full-close, and all points
between, any desired humidity can be quickly generated and
stabilized upon.

Additionally, because the RH CAL is continuously monitoring
the sample chamber conditions via its integral chilled mirror
sensor, it is able to instantaneously react to changes in
humidity and maintain control stability.

All Edgetech Instruments calibration products and systems
are manufactured and supported in the USA in a modern,
ISO 9001:2015 registered facility with ISO/IEC 17025:2005
accredited calibration laboratory. The RH Cal is delivered with a
multi-point NIST traceable ISO/IEC 17025:2005 accredited
calibration certificate as standard.

Portable Relative Humidity Calibrator

Features:

• Completely self-sufficient and portable
humidity calibration system

• Field proven, primary method chilled mirror
technology

• Portable validation of dew/frost point and
temperature sensors

• Highest accuracy available for both relative
humidity and temperature

• Relative humidity accuracy: ±0.5%

• Relative humidity range: 5% to 95%

• Temperature accuracy: ±0.1°C

• Temperature range: 10°C to 50°C

• Temperature and relative humidity are

controlled independently

• Automatic correction for mirror contaminants

• Certified against NIST traceable standards

• Standard features, where others charge

extra

The Edgetech Instruments RH CAL

Portable Relative Humidity Calibrator

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

Measurement Ranges:

Relative humidity:
5 to 95%
Temperature:
10°C to 50°C
Dew/Frost Point:

-40°C to 60°C with D2 sensor

Accuracy:

Relative humidity: ±0.5%
Temperature: ±0.1°C
Dew/Frost Point: ±0.2°C nominal

Chilled Mirror Temperature Sensors:

3-wire platinum resistance thermometer (PRT),
100 ohms at 0°C, nominal

Depression:

60°C (113°F), nominal with D2 sensor

Slew Rate:

1.0°C (1.8°F)/second max., above 0°C

Repeatability:

±0.05°C

Hysteresis:

Negligible

Power Requirements:

100 to 240 Vac, 50-60 Hz, 150 W maximum

Sample Flow Rate:

1 liter/minute (2.0 SCFH) nominal

Operating Temperature:

Control Unit: 0°C to +50°C (+32° to +122°F)

Outputs:

Analog (0 to 5 Vdc or 4 to 20 mA)
RS232C serial port

Display:

Multi-line graphical LCD

Rev. v7

Sample Chamber Probe Port Diameters:

Standard port sizes for RH probes:
10, 12, 18 mm, 1/2, 3/4 in. diameter

Standard port sizes for dew/frost point
probes:

1/2 to 1 1/4 in. diameter
Custom port sizes available

Weight:

15.4 kg (34 pounds)

Dimensions:

20 5/8 W x 17 3/16 D x 8 9/16 H in
(52.4W x 43.7D x 21.7H cm)

Sensor Materials:

Chromium, glass, epoxy, anodized
aluminum

Enclosure:

Ultra high impact structural copolymer
carrying case

RH CAL with Probe Inserted for Calibration

Through Port Into Sample Chamber