Thunder Scientific 1220 Automated Two Pressure Humidity Generation System Owner's Manual

The Model 1220 Automated Two-Pressure Humidity Generation System
by Thunder Scientific Corporation is a self-contained system
designed for precise humidity generation and control. It features
advanced pressure and flow control mechanisms operated by a
high-performance Control System.

Principle of Operation

The two-pressure humidity generation process involves precise
pressure and mass flow control using computer actuated
electromechanical valve assemblies. Saturation pressure and mass
flow are continuously monitored and controlled using PID
algorithms.

Computer/Control System

The Control System of the Model 1220 encompasses a
high-performance stand-alone system with 24 bit I/O modules for
data acquisition. It utilizes USB and serial interfaces to control
transducers and stepper motors for humidity generation. Calibration
is crucial for accuracy, and the system employs integrated software
calibration for temperature and pressure transducers.

Test Chamber

The system includes a fluid jacketed test chamber with internal
dimensions of 8″ x 8″ x 8″ (203 mm x 203 mm x 203 mm) for
conducting humidity tests.

Product Usage Instructions

Ensure the system is connected to a power source within the
specified electrical power range.

Check the gas supply to maintain a pressure of 160 psiG at a
flow rate of 20 L/min.
Operate the Control System using the multi-point touch screen
for data inputs.

Calibrate the temperature and pressure transducers using the
integrated software calibration feature.
Monitor and control humidity generation by adjusting pressure
and mass flow through the computer interface.

Frequently Asked Questions (FAQ)

Q: What are the power requirements for the Model 1220?

A: The system requires an electrical power supply of 100-240 V~,
drawing 5 A at a frequency of 50/60 Hz.

Q: How is pressure and mass flow controlled in the system?

A: Pressure and mass flow are controlled through computer
actuation of electromechanical valve assemblies, with continuous
monitoring and adjustment using PID algorithms.

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Thunder Scientific Corporation
Model 1220
Automated “Two-Pressure” Humidity Generation System

Model 1220
Automated “Two-Pressure”
Humidity Generation System

FEATURES
· Traceable to SI 1
· 0.6% of Reading RH Uncertainty 6
· No Refrigerants – Thermoelectric Cooling/Heating
· Based on the NIST “Two-Pressure” Principle
· ControLog® Embedded Automation Software
· Automatically Applies Enhancement Factors
· HumiCalc® with Uncertainty Mathematical Engine
· Generate Multipoint Profiles · Test Chamber 8″ x 8″ x 8″
· Flow Capability of 20 L/min
· Multi-point Touch Display
· Window Door Option is Available
DESCRIPTION
The 1220 Humidity Generation System is a self-contained
system capable of producing atmospheres of known humidity using the fundamental “two-pressure” principle. This system is capable of continuously supplying relative humidity, dew point, frost point, parts per million, or other calculated values for instrument calibration and evaluation as well as for precision environmental testing. This system will automatically generate manually entered humidity and temperature set points as well as user created multipoint profiles. All desired humidity’s, temperatures, flow rates, and time intervals may be programmed. The 1220 humidity generating system incorporates a test chamber, with internal dimensions of 8″ x 8″ x 8″. Test chamber pressure range is ambient. Access is available through one 1.875″ diameter port located on the right side, for probes, cables, sample tubes. The test chamber accommodates various solidstate sensors, sensing systems, chilled-mirror hygrometers, as well as material samples for environmental testing. Virtually any humidity and temperature may be generated, for long periods of time, within the operational limits of the generator. The output or recording of the device under test may then be compared with the generator’s data for analysis.

PRINCIPLE OF OPERATION
The “two-pressure” humidity generation process involves
saturating air or nitrogen with water vapor at a known temperature and pressure. The saturated high-pressure air flows from the saturator, through a pressure reducing valve, where the air is isothermally reduced to test pressure at test temperature. Humidity generation is dependent on the measurement of temperature and pressure, not on the amount of water vapor measured in the air. System uncertainty is determined by the temperature and pressure uncertainties, and on the stability and uniformity of the measurements. When setpoint equilibration has been reached, the indication of saturation temperature, saturation pressure, test temperature, and test pressure, are used in the determination of all hygrometric parameters.
Elemental Schematic of the 1220 generator.
COMPUTER/CONTROL SYSTEM
The 1220 Humidity Generation System encompasses
a high-performance stand-alone Control System that performs all functions required for humidity generation and control. The Control System employs 24 bit I/O modules with integrated signal conditioning to acquire data and uses USB and serial interfaces to transducers and stepper motors to control the operation of generating humidity.

Temperature Control: Ultra stable temperatures are attained through solid-state thermoelectric cooling and heating of a circulating fluid that jackets the test chamber and associated humidity generation components. Chamber and saturation temperatures are governed by this medium which is computer controlled at values between 5 °C and 60 °C using PID (proportional-integralderivative) algorithms.
Pressure and Flow Control: Pressure control and mass flow control are accomplished through computer actuation of electromechanical valve assemblies. Saturation pressure and mass flow are measured continuously and controlled using PID algorithms similar to those employed in temperature control.
Calibration: Proper calibration of the temperature and pressure transducers ultimately determines the accuracy of the generator. The humidity generator employs an integrated software calibration scheme allowing the 1220’s probes and transducers to be calibrated while they are electrically connected to the humidity generator. Coefficients for each transducer are calculated by the computer and stored to memory.
Multi-point Touch Screen for quick and easy data inputs.
CONTROLOG FEATURES
ControLog is an embedded software application that
fully automates the operation of the 1220 Humidity Generation System and allows various device connections through a number of different interfaces. ControLog uses Thunder Scientific’s HumiCalc with Uncertainty as its mathematical engine for computing all humidity values and real-time uncertainties. Data from the generator and attached devices is automatically retrieved and stored for viewing in either numerical or graphical format in real time or post process. Data can be transferred off the system via a USB drive for further viewing, post processing and printing using an external PC.

Key features of the of the ControLog software are:
· Data: ControLog stores data into individual data sheets (tab). Each data sheet contains a spreadsheet type view that consists of a date/time stamp and the measured data items corresponding to that date/time stamp. Data sheets consist of three similar but different types: Device Data, File Data and Data Summary. Each type has the same spreadsheet type view and operation, but all three have different data sources.
· Graphing: Graphing is a powerful tool used to view previously recorded data or to monitor the current data in real-time. The graph works hand in hand with the data sheets. While the generator is in operation, data sheets store the most recent data points from the generator and or connected devices at the desired interval. A graph can be used to create a visual picture of this stored data.
· Profiling: The Auto Profiling feature is very similar to the Generate mode with the main exception that profiling relies on a predefined list of setpoints referred to as a profile. The user configurable profile is used as ControLog’s road map during Auto Profile operation. It defines which setpoint values to go to, at what rate to go from one setpoint to another, and how long to stay at a specific setpoint before moving to the next setpoint.
· Device Interface: ControLog supports a customizable interface that works with most devices. ControLog will allow the user to create a new device connection using the “Connection Wizard” or open previously saved connections. The wizard will open a separate dialog window containing various steps that will guide the user in defining the communication required to receive the desired data items from the device. The user can create as many (up to 60) or as few data items as they see fit for any one device. Each data item can be uniquely named and once connected will be recorded in its own data sheet. ControLog also allows the user to save these interfaces for future use.
TEST CHAMBER
The 1220 Humidity Generation System incorporates a
fluid jacketed test chamber with internal dimensions of 8″ (203 mm) x 8″ (203 mm) x 8″ (203 mm).

Model 1220

Automated Humidity Generation System

SPECIFICATIONS 1
Relative Humidity Range: ……………………………………………………………… 10 to 95 %RH Relative Humidity Range: 2…………………………………………………………….. 95 to 98 %RH Frost Point Temperature Range: ……………………………………………………….. -22.0 to 0 °C Dew Point Temperature Range: ……………………………………………………… -24.5 to 58 °C Chamber Fluid Temperature Range: 3……………………………………………………… 5 to 60 °C Chamber Fluid Temperature Control Stability: 4………………………………………… 0.005 °C Chamber Temperature Uniformity:5…………………………………………………………… 0.05 °C Chamber Fluid Temperature Heating/Cooling Rate: ……………..0.3 °C per Minute (avg.) Gas Type: …………………………………………………………………………………… Air or Nitrogen Gas Pressure Rating: (MAWP) ……………………………………………………………….. 175 psiG Gas Flow Rate Range: …………………………………………………………………….. 1 to 20 L/min Gas Flow Rate Specification: ……………………………………………………………… ±2.5 L/min Saturation Pressure Range: ……………………………………………………. Ambient to 160 psiA Test Chamber Pressure Range: ……………………………………………………………….. Ambient Supply Pressure Range: ………………………………………………………… Ambient to 160 psiG Supply Pressure Specification: …………………………………………………………………. ±1 psiG Display Resolution: ……………………………………………………………………………………. 0.001 Test Chamber Dimensions: ………………….. 8″ x 8″ x 8″ (203 mm x 203 mm x 203 mm) Access Port: ……………………………………………. Ø1.875″ (47.6 mm) located on right side Physical Dimensions:….. 16.1″ H x 27.9″ W x 19.2″ D (409 mm x 708 mm x 487 mm) Weight: (Generator Only) ……………………………………………………………….150 lbs (68 kg)
UNCERTAINTY 6
RH Uncertainty: 10 to 95 %RH, 5 to 60 °C, @ 20 L/min …………………. 0.6% of reading RH Uncertainty: 95 to 98 %RH, 15 to 60 °C, @ 10 L/min ……………….. 0.6% of reading Frost/Dew Point Uncertainty: < 0.01 °C, @ 20 L/min ………………………………….0.05 °C Dew Point Uncertainty: 0.01 to 58 °C, @ 20 L/min ……………………………………..0.08 °C Temperature Uncertainty: 5 to 60 °C ……………………………………………………….. 0.031 °C Saturation Pressure: Ambient to 160 psiA ……………………………………………….0.037 psiA Chamber Pressure: Ambient …………………………………………………………………0.007 psiA

UTILITIES
Electrical Power: ……………………………………………………….. 100-240 V~, 5 A, 50/60 Hz Gas Supply: 7………………………………………………………………………. 160 psiG @ 20 L/min

ENVIRONMENTAL
Operating Temperature: …………………………………………………………………….. 15 to 30 °C Storage Temperature: ………………………………………………………………………… 10 to 50 °C Humidity: ……………………………………………………………… 5 to 95% RH Non-condensing

Dimensions are excluding feet, handle, and other protrusions. Other custom options are available.

1. Traceable to the International System of Units (SI) through a national metrology institute (NIST) recognized through a CIPM MRA. 2. The system will limit mass flow rate to 10 L/min at %RH greater than 95. 3. Only the water heat transfer fluid circulating around the chamber is controlled to setpoint. Chamber temperature inside the chamber may vary depending on door configuration,
setup, and uniformity. 4. Temperature Control Stability is defined as the standard deviation over a 10-minute period, as measured by the saturation temperature control sensor after being at point for 60 minutes. 5. Chamber Temperature Uniformity is defined as the maximum temperature difference between any two locations at a single point in time. Locations are within two inches of the
chamber wall and chamber door. The chamber inlet was directed toward the center of the door using a 90° stainless steel tube. 6. Chamber pressure at 1 atmosphere, Uncertainty values represent an expanded uncertainty using a coverage factor, k=2, at an approximate level of confidence of 95%.
Uncertainty is not specified at flow rates below 10 L/min. Uncertainty is based on the worst-case value from the 1220 uncertainty analysis. 7. Regulated supply pressure lower than the recommended 160 psiG is acceptable but may limit the lowest humidity obtainable from the generator and will require an internal
pressure regulator (REG) adjustment. Note: The specifications listed, and the information provided are subject to change without notice. THUNDER SCIENTIFIC ®, HUMICALC ® and CONTROLOG ® are the registered trademarks of Thunder Scientific Corporation.

For More Information or to Place an Order Contact:

0625-1220

Thunder Scientific®
623 Wyoming Blvd. SE = Albuquerque, New Mexico 87123-3198 Ordering: 800.872.7728 = Tel: 505.265.8701 = FAX: 505.266.6203
www.thunderscientific.com

Documents / Resources

Thunder Scientific 1220 Automated Two Pressure Humidity Generation System [pdf] Owner's Manual
1220 Automated Two Pressure Humidity Generation System, 1220, Automated Two Pressure Humidity Generation System, Two Pressure Humidity Generation System, Humidity Generation System, Generation System, System

References

User Manual

Thunder Scientific 1220 Automated Two Pressure Humidity Generation System Owner’s Manual

1220 Automated Two Pressure Humidity Generation System

Specifications

Product Description