Trident™ Moisture content in sand, fine, and coarse aggregates
A microwave meter for rapid determination of moisture content in sand and other fine and coarse aggregrates.
A Microwave meter for rapid determination of moisture content in sand and other fine and coarse aggregates.
The Trident™ T-T-90 utilizes the latest microwave and microprocessor technology to measure moisture content in various fine and coarse-grained materials. The prongs of the probe are inserted into the material to be tested and the percentage of moisture content is instantaneously shown on the easy to read display.
An average of five to ten readings is normally taken in order to ensure a valid result. This output is converted by the integrated microprocessor and the moisture content is displayed directly as a percentage of dry weight. The Trident™ comes calibrated for both sand and aggregate, and can be programmed by the user with up to ten different materials.
The Trident™ can store more than 150 readings - complete with time and date for future reference. Data can be recalled via RS-232 interface to a personal computer.
Features & Benefits:
Fast and easy to use: Simply insert the prongs into the sand or aggregate.
Accurate.
Completely portable.
Easy to read display.
Instantaneous readings
Technical The James Trident™ represents a break-through in modern moisture measurement technology. By utilizing the latest microwave and microprocessor technology, the Trident™ can determine the moisture content of sand, gravel, crushed stone and other fine and coarse aggregate. Simply insert the prongs of the probe into the material to be measured and instantaniously the percentage of moisture content is shown on the easy to read display.
The Trident™ Microwave moisture meter uses a five prong sensor to measure the complex dielectric constant of the material encompassed by the outer four prongs. As the dielectric constant of water is four to eight times greater than most aggregates, changes in water content directly effect the sensor output. An average of five to ten readings is normally taken in order to ensure a valid reading. This output is then converted by the integrated microprocessor and moisture content is dis-played directly as a percentage of dry weight.
The unit comes calibrated for both sand and aggregate. It can also be programmed with up to ten different materials by the user. For highest accuracy, the unit should be programed for the material being tested. Simple to use WIN95/WINNT software is provided for calibrating the unit to the various materials.
Finally, the Trident™ can store over 150 readings. Storage is complete with the time and date for future reference. Data can be recalled via RS-232 interface to a personal computer running The James Trident™ T-90 Moisture Meter Computer display of the Trident™'s actual readings of moisture content within a sand test sample.
Specifications
Moisture Range:
0 - 20% by Dry Weight
Frequency:
50 Mhz
Power:
4 AA Batteries
Display:
4 x 16 Char. Trans - reflective
Data Link:
RS - 232
Weight:
4 lbs. (1.8 kg)
Sales Numbers
T-T-90:
Trident™ Microwave Moisture Meter
T-T-92:
Trident™ Microwave Sensor
T-T-93:
Trident™ Microwave Meter
Instructions GENERAL OVERVIEW The James Instruments Trident™ is a revolutionary digital moisture meter for granular materials. It allows the user to measure the complex dielectric constant of the mixture of water and material under investigation. As it has been shown in many studies that the complex dielectric constant is directly related to the amount of water present, the built in microprocessor can convert this value directly into the percentage of moisture. The Trident™ consist of a 100 MHZ probe and logging unit that can processes the data from the unit and can store it for later retrieval.
The Trident™ probe has 5 stainless steel prongs to insert in the material to get a moisture content reading. Each prong is 3.5 inches in length with a diameter of 0.125 inches. They should be inserted so that the entire prong is covered by the material under investigation. The volume tested is that enclosed by the four outer prongs of the sensor unit. The robust prongs have been designed to be inserted into various materials. Most commonly used materials are sand, aggregate, and gravel.
Proper cleaning and maintenance of probes is required for accurate readings. Any contaminating material attached to the probes can influence subsequent readings. Stainless steel probes should be cleaned before and after testing has been completed. The Trident™ prongs cover a surface depth of about 5 inches. For accurate readings, it is recommended to remove the top layer of the material to be tested as this is generally the driest region. Keep in mind that moisture always flows to the bottom of these materials. The more moisture suspected in the material, the deeper the depth you want your testing to be. A note of caution is in order; it has been found that the moisture content of sand and aggregates, etc. can vary by as much as 5 percent through a rather small volume.
The unit comes from the factory with a variety of modes to assist the user in determining moisture content. The unit comes pre-programmed to analyze sand, gravel, and crushed stone. There is also a mode to read the output of the sensor directly. The Trident™ can also be programmed with up to ten different user programs. These are correlation factors that pertain to the direct material the user is dealing with and should be used for the most accurate readings. There are also the capabilities to upload the data stored in the unit to a P.C. for later analysis, as well as a clock to help synchronize and differentiate the data.
Finally, the unit comes with our P.C. software which simplifies uploading of data to a windows compatible P.C. and analyzing the data for later programming of the unit. When required, the software will automatically monitor the serial communication port specified by the user. Once transmission of data from the Trident™ unit has occurred, this information will appear in the edit window in the software. This data can then be analyzed by the built in software of the program or with a common spread sheet. The built in software will take the user step by step through each record and allow the user to enter the moisture percentage associated with each reading. Once all the readings have an associated moisture percentage, the data can be graphically displayed and the optimal correlation relationship determined. Coefficients representing this relationship are displayed for subsequent loading into the Trident™ unit.
The Trident™ is an easy and accurate way of testing moisture in a controlled or uncontrolled environment. Every effort has been made in providing a user friendly robust and accurate system for the measurement of moisture in granular materials. A robust sensor which responds to water content has been created. This feeds into the main microprocessor unit of the Trident™ allowing the user an instantaneous direct reading of the moisture under test.
GENERAL NOTES ON THE USER PROGRAM For best results with the James Instruments’ Trident™, user programs should be created for the different materials that the equipment will be used with. These are precise correlations that account for material differences inherent in local conditions. A simple least squares linear correlation between the output of the probe and the moisture content of the material is all that is required.
This can be obtained via a simple test method. Please follow the points below describing the test procedure.
First a two to three kilogram sample should be collected.
The material under investigation should be baked at a relatively low temperature (50° C to 60° C) until the sample no longer loses any weight. The loss in weight should be below 1% of the total mass of the sample.
Approximately five to ten readings from the sample should then be taken with the Trident™ in Direct Mode and the moisture as well as the corresponding reading should be recorded. The reading can be recorded either digitally or manually. The moisture content should be recorded manually.
Water should be added and the sample mixed thoroughly. Enough water should be added to increase the water content by 1 – 3% increments. The increment depends upon the number of sets of data the end user wishes to use. From five to ten sets of data are normally adequate to produce accurate and reliable results.
Continue adding water and taking data readings. This procedure should be repeated until the sample reaches saturation, at this point the reading from the meter will become constant. For sand this point will be between 20 – 30%. For aggregate, this point will be between 7 – 15%. Constant data points from the instrument should not be used for correlation.
After the data has been collected, a correlation relationship needs to be established. This is a linear relationship of the form
% Moisture = Gain * Direct Reading + Offset
Where: % Moisture – Final Value Gain – Multiplier obtained from the Data Direct Reading – Value obtained from the meter Offset – additive factor from gathered data
From the data generated above a best fit line through data can be generated. This can be accomplished either with a spreadsheet or with the accompanying software. In inserting the percentage moisture with the software, the time, and date stamp field can be used to identify which tests were associated with which moisture percentages. The Gain and Offset parameters are the two values that need to be programmed into the Trident™ in order to define the User program (see Ch. User prog).
Trident™ LOGGING UNIT
Menu Items
UNIT OPERATION The Trident™ was designed for simple operation. Upon start up, the unit should show a brief (five second) display of our company name and software version. The unit will then proceed directly to the menu item it was last on before it was turned off. The menu structure is as follows:
Sand Gravel Crushed Stone Direct User 1-10 Ch. User Mat. Upload Data Change Date
You can scroll through the menu by pressing an arrow key. Either arrow key will allow you to scroll through the memory. The Sand, Gravel, Crushed Stone, Direct, and User menu items will each simply show the instantaneous reading of the sensor, menu item selected, and the date/time. Pressing the Enter key while in any of these modes will record the reading, menu item selected, and date/time that the reading was taken in the main memory for later upload to a personal computer. The memory is non–volatile and will not be erased by turning off the power.
SAND The Trident™’s reading of moisture in sand is superior to other techniques. Moisture contents of beyond 20 percent by weight can be rapidly and accurately determined by the Trident™. The reading obtained in this mode is generally within 2 – 3% of the actual moisture level. More accurate readings can be obtained by pre-calibrating the unit to the specific sand being tested.
GRAVEL This is the general category for the smaller aggregates with rounded edges that is commonly used in construction. The Trident™ will generally read moisture levels to the 12 percent range by wet weight.
CRUSHED STONE Crushed stone refers to rock building material that has sharper corners and packs less densely than the gravel. Maximum size of the pieces is determined by the prongs on the probe and is approximately 3/8 to ½ inch square. The maximum percentage of moisture detected depends heavily on the size of the stones. Small finely crushed stones have a moisture percentage detection of up to 10 percent. Bigger crushed stones have a maximum percentage range of up to 8 percent.
DIRECT This mode is used when calibrating the unit directly to a user material. This shows the raw reading coming to the A-D converter of the unit from the sensor. By recording the value for a range of moisture and correlating this value, the unit will then be calibrated for the specific material being monitored by the Trident™.
USER PROGRAM The Trident™ can be programmed with up to ten different user materials for subsequent testing. These are labeled on the unit 0 – 9 and are displayed in sequential order. Their programming is performed in the Ch. User Mat. section. The final value from the user generated calibration function will be displayed instantaneously with different outputs from the probe.
CHANGE USER PROGRAM To change the user program please follow these steps:
Use the plus and minus keys to select the menu item Ch. User Mat.? (Enter for Yes)
Pressing enter will bring up the following message: User Pog.? X (0-9) where X is the user program that you wish to change ranging from 0 to 9.
Use the plus and minus keys to change the value of X until you have reached the user program you are interested in.
Pressing enter brings the message OFFSET sXX.XX Where: s is the sign either + or – X is the value
Pressing the plus or minus keys will increment this value. Pressing and holding the plus or minus key will rapidly increment this value.
Once the proper value has been reached, press the enter key. The unit will display the following: GAIN x.xxx where: x is the value to be entered.
Again pressing the plus or minus keys will increment this value. Pressing and holding the plus or minus key will rapidly increment this value.
Finally pressing the enter key enters these values into memory and sets up the user program for subsequent use.
For further information regarding the meaning of the OFFSET and GAIN parameters, please refer to the General Notes on the User Program.
UPLOAD DATA Please follow the bottom steps in order to upload the data stored in the unit to a P.C.
Connect the unit to the correct serial port of the P.C. using the supplied serial cable.
Use the plus or minus keys until the following message is displayed: Upload Data (Enter for Yes)
Pressing enter will display the following message: Erase Data? + for Y – for N
Pressing either button will commence the upload process and display the message: Data Upload in Process Once the process is complete the following message will be displayed: Upload Complete! for a few seconds and then the Upload Data message from above will appear.
For more information regarding uploading the data to a personal computer please refer to Tools.
CHANGE DATE To change date and time please follow these steps:
Press the + or – arrow key until you get to Change Date? (Enter for Yes)
Pressing enter will display the date and time in the following format: hh:mm MM/DD/YY Where: hh – hour range 0 – 24 mm – minute range 1 – 60 MM – month range 1 – 12 DD – day range 1 – 31 YY – Year range 00 – 99
The cursor should be blinking over the two hour digits
Pressing the plus or minus keys will increment the digits at the cursor. Holding the plus or minus key will increment the value rapidly.
Pressing the enter Key will store the value selected and move the cursor to the next proper position.
Pressing the enter key at the year position will bring the user to the “Change Date” menu screen describe above.
Power Key – Momentarily push this key to turn on the unit. Pressing it again turns off the unit. The unit will power up displaying the same menu selection as when it was powered down.
Average Key – Depressing this key holds the current value and an “A” appears next to this value on the display. This then displays a running average of readings entered by pressing this key.
Enter Key – This key can be used to store data points in the units. Depressing this will display an “S” next to the value being read for a few seconds. The reading will then be stored in the unit along with the type of material being used and the date and time. This can subsequently uploaded to the P.C. for later retrieval. It is also used in various ancillary functions such as changing the date and the time, uploading the data to a P.C. and programming the unit for user materials.
Plus Key – This key is used to scroll through various settings.
Minus Key – This key is used to scroll through various settings.
X – Menu item currently being used
n – Current moisture reading
A – auxiliary character used to show data being stored and held
hh – Current hour
mm – Current time
MM – Current month
DD – Current day
P.C. SOFTWARE
FILE
Open (Ctrl + O) Opens previously saved files containing data.
Close Closes currently open files
Save
Saves As
Saves uploaded data. Files are saved as *.TXT for later analysis via spreadsheet or insertion in your favorite word processor.
Exit Terminates the program and returns to your operating system.
TOOLS
Upload (Ctrl + U) This command is used to upload data from module to the CPU.
For proper upload of data to a P.C. please follow these steps:
Open Trident™ software (title of screen should read Trident™ Regression Analysis) on the P.C.
Connect P.C. and Trident™ by the RS-232 serial port
On the Trident™ use the + or – arrow keys until the “Upload Data screen appears on the display.
Press Enter.
Go to the Trident™ software (needs to be installed on P.C.) click on the upload icon or press CTRL + U
Trident™ software will ask you to “Please start upload.”
At this moment press the + arrow to erase data or the – arrow to save data after upload (Trident™ software waits 10 seconds for the upload information). If no data is received after 10 seconds, a “No data received” sub screen will appear.
Data will appear on the screen after the + or – arrow key selection was made.
Save data in desired folder.
Analyze (Ctrl + A)
Allows the user to view individual record, graph data, and determine the correct coefficients for the user program. This key should only be used when data is uploaded from the unit that was saved in direct mode. It is then used to analyze the data and generate a user program. This feature is not enabled until a data file has been brought up on the screen.
This shows the record number, date the record was taken, time the record was taken, value of the direct readout, and a corresponding percentage moisture that needs to be completed by the user in order to generate a correlation curve.
Pressing the OK button updates the data in the file and brings up the next record in the file. Pressing the cancel button cancels the entire operation.
Once the last data point has been entered the Finish button can be pressed in order to generate a correlation curve.
This will produce a display of the correlated data and the appropriate OFFSET and GAIN parameters to be entered in the Trident™.
Ports This command allows setting the correct (RS – 232) Com port. It can be Com 1 through Com 4. The default setting is Com 1.
LEAST SQUARES ANALYSIS OF A STRAIGHT LINE FIT
For this method, we assume that there exists a linear relationship between the output of the probe and the amount of moisture in the material to be tested.
This relationship takes the form:
% Moisture = Gain * Direct Reading + Offset or y = a*x + b
What need to be determined are the parameters Gain or Mand Offset or b from a given set of points determined by testing.
We can then define:
Where x¡ and y¡ are individual pairs of values for x and y defining each of the pairs of points to be plotted. The quantity n is the number of points.
The Gain of the line, a is now simply: a = Sxy/Sxx
The Offset, b can be calculated as: b = y¡/n – ax¡/n
This is performed automatically by the accompanying software and is also available in most spread sheet programs.
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Calibration Procedures
Dry sample in low heat using oven. It is suggested to weight sample prior to drying.
When sample has lost all moisture, calibration can be started. Weight dried sample
Add water by 2 percent increments. i.e. 4,000 grams – 2 percent water = 80 grams of water Turn T-90 on
Using up or down arrows, scroll through the menu selection until Direct mode appears on the T-90 display. (It is recommended to erase all prior data saved in the T-90. (T-90 manual page 11))
Take 10 readings for each percentage. Store each reading by pressing enter.
After T-90 has hit full saturation (direct reading 409.5 percent), uploading data to C. Software is necessary.
Uploading can be done by connecting the Trident™ to the P.C. using the supplied RS232 cable.
Use instructions in the T-90 manual pages 14-17 to successfully accomplish calibration.
Once analyzation has been completed with the T-90 P.C. Software, the Offset and the Gain will be displayed. Write down these two values.
Return to the T-90 and enter a user program. (T-90 manual page 7 “Change user program”) Once the gain and offset have been enter
d in the T-90, calibration has been completed.
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