Thunder Scientific 9500 Two Pressure Humidity Generation System Owner’s Manual

: June 13, 2024
: Thunder Scientific

Table of Contents

Thunder Scientific 9500 Two Pressure Humidity Generation System
Product Information
Product Usage Instructions
FEATURES
DESCRIPTION
PRINCIPLE OF OPERATION
TEST CHAMBER
APPLICATIONS FOR USE
SPECIFICATIONS
CONTACT
References
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Thunder Scientific 9500 Two Pressure Humidity Generation System

Product Information

Product Name: Model 9500 Automated Two-Pressure Humidity Generation System
Manufacturer: Thunder Scientific Corporation
Description: The Model 9500 Automated Two-Pressure Humidity Generation System is a versatile device used for generating and controlling humidity levels for various applications, including environmental testing and research and development. It incorporates advanced technology and software for accurate and precise humidity generation.

Key Features

Two-pressure humidity generation process
Computer/control system with embedded software application (ControLog)
Pressure and flow control through computer actuation of electromechanical valve assemblies
Calibration of temperature and pressure transducers through integrated software calibration scheme
Test chamber with removable cover and access ports
Wide range of relative humidity (5 to 98% RH) and flow rate (10 to 100 L/min)

Product Usage Instructions

To use the Model 9500 Automated Two-Pressure Humidity Generation System, follow these steps:

Ensure that the system is connected to a suitable air source and power supply.
Turn on the system by pressing the power button.
Wait for the system to initialize. The ControLog software will be displayed on the computer screen.
Configure the desired humidity and temperature settings using the ControLog software.
Ensure that the test chamber is properly sealed.
Set the desired flow rate using the flow control valve.
Monitor the pressure and flow readings displayed on the computer screen to ensure they are within the desired range.
Allow the system to run for the desired period of time to generate the required humidity levels.
Once the humidity generation process is complete, turn off the system and disconnect it from the power supply and air source.
Clean and maintain the system according to the instructions provided in the user manual to ensure optimal performance.

Note: It is important to carefully read and understand the complete user manual before operating the Model 9500 Automated Two-Pressure Humidity Generation System to ensure proper usage and safety.

Model 9500

Automated Humidity Generation System

FEATURES

Traceable to SI 1
0.17% * R + 0.016 RH Uncertainty 4 5
High Flow Capability
Based on NIST Proven “Two-Pressure” Principle
Generate: RH, DP, FP, PPM, Multipoint Profiles
Computes System Uncertainties in Real Time
Automatically Applies Enhancement Factors
ControLog® Embedded Automation Software

DESCRIPTION

The 9500 Humidity Generation System is capable of producing known humidity values using the fundamental, NIST proven, “two-pressure” principle. The 9500 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 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, test pressures, flow rates, and time intervals may be programmed. Visual indications of system status are displayed in real time on the computer monitor.

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.

COMPUTER/CONTROL SYSTEM

The Model 9500 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 serial interfaces to transducers and stepper motors to control the operation of generating humidity. The Control System utilizes an embedded operating system in conjunction with specialty software to control and interface with the human to machine interface (HMI) computer running ControLog.

ControLog is an embedded software application that fully automates the operation of the 9500 Humidity Generation System and allows various device connections through a number of different interfaces. 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 and post processing using an external Windows PC. The ControLog software also provides the primary interface to the operator via the multi-point touch display and keyboard.

Key features of the ControLog software are

Data stored to individual data tabs in a worksheet type view.
Graphing tabs to create a visual picture of the stored data.
Auto Profiling to automate the generator operation.
Device connections that work with most devices to allow data communication with the devices under test.

Temperature Controlled Bath: The 9500 humidity generating system incorporates an extremely stable temperature bath. Bath temperature is digitally controlled by the computer to any value between 0 °C and 72 °C using PID (proportional-integral-derivative) algorithms. The test chamber, saturators, heat exchangers, and connecting tubing are immersed in approximately 20 gallons of distilled water that is circulated at the rate of 50 gallons per minute by a magnetically coupled centrifugal pump. Fast fluid circulation provides the temperature conditioning of these components resulting in excellent bath stability and uniformity.

Pressure and Flow Control: Pressure control and mass flow control are accomplished through computer actuation of electromechanical valve assemblies. Saturation pressure, chamber 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 9500 employs an integrated software calibration scheme allowing the 9500’s 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.

TEST CHAMBER

The 9500 humidity generating system incorporates a completely immersed test chamber, with internal dimensions of 12” x 12” x 12”. Test chamber pressure range is ambient to 20 PSIA. The main chamber cover is removable utilizing quick release hold downs. Removal of the chamber cover allows a full 12 inch by 12 inch access to the test space. Access is also available through two 3.65” diameter ports in the chamber cover or two 1.125” inside diameter port cover adapters. The test chamber can accommodate various solid state sensors, 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.

APPLICATIONS FOR USE

Chilled Mirror Hygrometers: Install the actual chilled mirror head into the chamber or insert a sample tube through a test port and draw a sample through the chilled mirror head to: verify mirror temperature measurement accuracy (calibration) when the hygrometer is in thermal equilibrium with its environment; perform operational checks of the heat-pump and optical components before and after mirror cleaning and balancing; determine whether the hygrometer is controlling the mirror deposit in the liquid phase or ice phase when operating at dew and frost points below 0°C; determine if the hygrometer is correctly calculating other humidity parameters; determine the hygrometer’s repeatability, stability, and drift characteristics.
Humidity Sensors and Chart Recorders: Insert your humidity probe through a test port in the chamber or install the humidity sensing system directly into the chamber to: determine humidity calibration accuracy and/or characterize humidity sensitivity by subjecting the humidity sensor to a variety of humidity levels; perform operational checks such as the sensing systems capability to correctly calculate and display other humidity parameters; determine the repeatability, stability, hysteresis, and drift characteristics of various humidity sensing systems.
Environmental Testing: The 9500 can serve as a test bed for evaluation and R&D of humidity sensors, humidity sensing systems, and humidity sensitive products, e.g., polymers, composites, film, magnetic medium, pharmaceuticals, soil hydrology, consumables, electronics, optics, etc.

SPECIFICATIONS

Relative Humidity Range: (Test Chamber @ 14.7 psiA) …………………………5 to 98 %RH
Dew Point Temperature Range: (Test Chamber @ 14.7 psiA) ………………….-35 to 70 °C
Frost Point Temperature Range: (Test Chamber @ 14.7 psiA) …………………..-32 to 0 °C
Bath Temperature Range: 2. ……………………………………………………………………..0 to 72 °C
Bath Temperature Control Stability: 3.. ………………………………………………………..0.002 °C
Bath Temperature Heating Rate: from 0 to 72 °C ………………0.5 °C per Minute (average)
Bath Temperature Cooling Rate: from 72 to 0 °C ……………..0.5 °C per Minute (average)
Chamber Temperature Uniformity: 4 …………………………………………………………..0.008 °C
Gas Type: ……………………………………………………………………………………..Air or Nitrogen
Gas Pressure Rating: (MAWP) ………………………………………………………………….350 psiG
Gas Flow Rate Range: ……………………………………………………………………10 to 100 L/min
Gas Flow Rate Specification: ……………………………………………………….. ±2% of full scale
Supply Pressure Specification: ……………………………………………………………….±1.25 psiG
Saturation Pressure – Low Range: ………………………………………………Ambient to 45 psiA
Saturation Pressure – High Range: …………………………………………………..>45 to 325 psiA
Test Chamber Pressure Range: ………………………………………………….Ambient to 15 psiA
Display Resolution: ……………………………………………………………………………………..0.001
Test Chamber Dimensions:. ……….12” x 12” x 12” (304.8 mm x 304.8 mm x 304.8 mm)
Physical Dimensions :…38.3” H x 60” W x 36” D (971.5 mm x 1524.0 mm x 914.4 mm)

UNCERTAINTY

Relative Humidity: 5 to 98 %RH, 10 to 100 L/min …………………………0.17% * R + 0.016
Example 1: If the %RH reading is 50 %RH. The uncertainty would then be: 0.17% * 50 + 0.016 = 0.101
Example 2: If the %RH reading is 10 %RH. The uncertainty would then be: 0.17% * 10 + 0.016 = 0.033
Dew Point: -27 °C to +70 °C Dew Point (Ps <= 140 psiA), 10 to 100 L/min……..0.03 °C
-35 °C to < -27 °C Dew Point (Ps > 140 psiA), 10 to 100 L/min…….0.05 °C
Frost Point: -22 to 0.01 °C Frost Point (Ps <= 100 psiA), 10 to 100 L/min.……….0.03 °C
-32 to < -22 °C Frost Point, (Ps > 100 psiA), 10 to 100 L/min……….0.05 °C
Temperature: 0 to 72 °C 8. ………………………………………………………………………….0.015 °C
Test Chamber Pressure: Ambient to 15 psiA ……………………………………………0.0021 psiA
Low-Range Saturation Pressure: Ambient to 45 psiA. ………………………………0.0042 psiA
High-Range Saturation Pressure: >45 to 325 psiA……………………………………….0.03 psiA

UTILITIES

Electrical Power: ……………………………………… 208-240 V~, 20 A, 3 Ø, 50/60 Hz, 4 Wire
Gas Supply: ………………………………………………………………………. 350 psiG @ 100 L/min
Cooling Water: ………………………………………………. 2 gpm (8 L/min) Maximum @ 21 °C

ENVIRONMENTAL

Operating Temperature: ………………………………………………………………………. 15 to 30 °C
Storage Temperature: ……………………………………………………………………………. 0 to 50 °C
Humidity: ……………………………………………………………….. 5 to 95% RH Non-condensing

Traceable to the International System of Units (SI) through a national metrology institute (NIST) recognized through a CIPM MRA.
Using glycol/water as the temperature bath heat transfer fluid from 0 to 5 °C and water as the temperature bath heat transfer fluid from 5 °C to 72 °C.
Temperature Control Stability is defined as the maximum deviation from a best fit line, as measured by the bath temperature control sensor. If data is logged digitally, the best fit line will be defined as the average value over the 10 minute period. All measurements made with an insulated cover in place over bath.
Chamber Temperature Uniformity is defined as the maximum temperature difference between any two locations over the temperature range of 0 °C to 72 °C when using a thermal insulator over the bath, such as hallow bath balls. Locations are defined at the center of the chamber lid access ports, approximately 5″ into the chamber.
Refer to “Model_9500_Uncertainty_Analysis_Rev3.2.pdf” for more information.
Uncertainty is not specified at flow rates below 10 slpm and above 100 slpm.
Uncertainty values represent an expanded uncertainty using a coverage factor, k=2, at an approximate level of confidence of 95%.
Includes saturation temperature, chamber temperature, bath temperature, pre-saturator temperature, and exp-valve temperature.

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