Wuhan Guide HTWS-V User manual

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Dear Client
Thank you for Purchasing our HTWS-V Dew Point Meter.
Please read the manual in detail prior to first use, which will help
you use the equipment skillfully.
Our aim is to improve and perfect the
company's products continually, so there may be
slight differences between your purchase equipment
and its instruction manual. You can find the changes
in the appendix. Sorry for the inconvenience. If you have further
questions, welcome to contact with our service department.
The input/output terminals and the test column
may bring voltage, when you plug/draw the test wire or
power outlet, they will cause electric spark. PLEASE
CAUTION RISK OF ELECTRICAL SHOCK!
Company Address:
T4，No. 41, High-tech 2 Road，East Lake High-tech Development Zone，
Wuhan
Sales Hotline: [phone]
After Service Hotline:[phone]
Fax: [phone]
E-mail: [email protected]
Website: www.hvtest.cc

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SERIOUS COMMITMENT
All products of our company carry one year limited warranty
from the date of shipment. If any such product proves defective
during this warranty period we will maintain it for free. Meanwhile
we implement lifetime service. Except otherwise agreed by
contract.
SAFETY REQUIREMENTS
Please read the following safety precautions carefully to avoid
body injury and prevent the product or other relevant subassembly
to damage. In order to avoid possible danger, this product can only
be used within the prescribed scope.
Only qualified technician can carry out maintenance or repair
work.
--To avoid fire and personal injury:
Use Proper Power Cord
Only use the power wire supplied by the product or meet the
specification of this produce.
Connect and Disconnect Correctly
When the test wire is connected to the live terminal, please do
not connect or disconnect the test wire.
Grounding
The product is grounded through the power wire; besides, the

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ground pole of the shell must be grounded. To prevent electric
shock, the grounding conductor must be connected to the ground.
Make sure the product has been grounded correctly before
connecting with the input/output port.
Pay Attention to the Ratings of All Terminals
To prevent the fire hazard or electric shock, please be care of
all ratings and labels/marks of this product. Before connecting,
please read the instruction manual to acquire information about the
ratings.
Do Not Operate without Covers
Do not operate this product when covers or panels removed.
Use Proper Fuse
Only use the fuse with type and rating specified for the product.
Avoid Touching Bare Circuit and Charged Metal
Do not touch the bare connection points and parts of energized
equipment.
Do Not Operate with Suspicious Failures
If you encounter operating failure, do not continue. Please
contact with our maintenance staff.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in Explosive Atmospheres.
Ensure Product Surfaces Clean and Dry.

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－Security Terms
Warning: indicates that death or severe personal injury may
result if proper precautions are not taken
Caution: indicates that property damage may result if proper
precautions are not taken.

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Contents
I. Overview......................................................................................... 6
II. Application..................................................................................... 6
III. Products features........................................................................ 6
IV. Product parameters.................................................................... 8
V. Panel structure..............................................................................9
VI. Operating principle................................................................... 10
VII. Operational approach............................................................. 10
VIII. Software operation.................................................................18
IX. Failure phenomenon and trouble shooting.......................... 26
X. Precautions.................................................................................26
XI. Packing list.................................................................................27
Appendix 1. Packing of transition joint of dew point meter..... 28
Appendix 2. Measurement requirement of water content in SF6
circuit breaker..................................................................................29

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I. Overview
HTWS-V Dew Point Meter is researched and designed by using imported
high-precision dew point sensor and the latest digital circuit control technology,
which is the intelligent precision instrument to measure the moisture content of
the SF6 gas
The instrument uses intelligent self-calibration technology, wide
measuring range, fast response, high accuracy, good linearity, dynamic display
measurement curve. While the instrument with automatic dryer, can greatly
shorten the measuring time.
II. Application
The device is suitable for the dew point value of SF6 gas measurement,
can also measure the dew point value of air, nitrogen, the inert gas and any
non-corrosive gases, especially used for the electric power, petrochemical,
metallurgy, environmental protection, scientific research institutes and other
departments, with high cost performance.
III. Products features
1. High stability: Under severe interference conditions, the measurement
data can be stabilized within ± 0.5 ℃, with excellent long-term stability, good
repeatability.
2. High precision: Adopts imported with original packaging
high-performance dew point sensor and high-speed 12 Σ-ΔAD
analog-to-digital converter (ADC), the highest resolution reaches 0.1 ℃, fully
meet the requirements of the actual measurement. The measurement results
are accurate and reliable within full range. Wide measuring range, fast

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response, stable and reliable.
3. Intellectualized: Boot self-calibration, the sensor probe can be
automatically calibrated zero, automatically eliminate systematic errors
introduced by zero drift, to ensure the accuracy of measurement.
4. Multiple protections: With oil filters, not affected by dust particles and
most of chemical contamination, to protect sensor resistance to oil, very
suitable for use in industrial environments. Dryer can effectively protect the
dew point sensor probe, prolong the service life of the sensor.
5. Rapid to save gas: after boot into measurement, the measurement time
of dew point is 3 ~ 5min. First use need to dry pipelines and sensors, slightly
longer time.
6. Powerful function: 4.7 inch colors touching LCD display. Direct display
dew point value (℃), micro-water value (uL / L), date and time, dynamic
display dew point measuring curve. Real-time save measurement data, can
store up to 100 sets of measurement data.
7. Communication: RS232 interface can be connected to PC serial port,
convenient for further process data.
8. Easy to use: Adopts imported self-locking connectors, easy to plug in or
draw out, safe and reliable, no leakage. Touching buttons easy to operate and
improve work efficiency. Built-in rechargeable lithium battery, small in size, light
in weight, easy to carry.

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IV. Product parameters
Measurement
Range
Dew point value
－80℃～+20℃
Micro water value
0～19999uL/L
Accuracy
±0.5℃（－60℃～＋20℃）
±1.0℃（－80℃～－60℃）
Resolution
Dew point value
0.1℃
Micro water value
1uL/L
Response time
(+20℃,0.1Mpa)
63% need 5s, 90% need 45s (-60 ℃~ +20 ℃)
63% need 10s, 90% need 240s (+20 ℃~ -60 ℃)
Sampling flow
rate
0.6L/min±20%
Pressure range
0～1.0Mpa
Temperature
－20℃～＋60℃
Humidity
0～100%RH
Storage
Temperature
－20℃～＋80℃
Charging time
4 hours
Dimension
250×150×300mm3
Weight
3.5kg

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V. Panel structure
1. The front panel layout of instrument is shown in Figure 1.
Figure 1 the front panel layout
①LCD screen
②Flow adjustment
③Power switch
④Status indicator
2. The back panel layout of instrument is shown in Figure 2
Figure 2 the back panel layout
①Gas inlet
②RS232 interface
③Charging hole
④Gas outlet
Note: at the same time press the bracket adjust button on both sides, can
adjust the angle of the bracket.

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VI. Operating principle
When measured gas into the sensor sampling chamber, the trace
moisture in the gas is adsorbed to the sensor, the sensor converts the change
into electrical signal, to be processed by the microprocessor, and finally display
on the LCD screen.
The device is composed of the gas path section, the sensor section, the
signal processing section and the liquid crystal display output section.
Operating schematic diagram as shown in Figure 3
Figure 3 operating schematic diagram
VII. Operational approach
1. LCD display description
The instrument adopts the 4.7-inch high-resolution color touch LCD
display; it can also be clearly displayed even in strong sunlight. Click on touch
screen button to complete the parameter setting, data storage and other
operations, the test results are displayed on the LCD screen. Graphics clear,
beautiful, easy to operate.
2. Connect to SF6 devices
Gas inlet
Flowmeter
Sensor
Gas outlet
AD conversion
Signal amplification
Time clock
Save
Communication
LCD display
Touch button

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As shown in figure 4 connection method, correct connect to inlet pipe and
outlet pipe
Figure 4 correct wiring
Note: ①according to Figure 4 correct wiring, do not connect inlet pipe and
outlet pipe wrong; ②with the wrench to tighten nut joints of inlet pipe and SF6
device; ③the other end of outlet pipe should be pointing downwind, or use
specialized equipment to collect waste gas.
3. Initialization
Turn on the power switch, the instrument into the initial interface, as
shown in Figure 5. In this process, the instrument will be self-calibrating
according to the state of sensors, at this time "status indicator" light flashes.
Self-calibration is completed, the "status indicator" light normally on.
Figure 5 initialization

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4. Check power
Initialization is completed, please check displayed battery power on the
bottom right corner of the LCD screen, as shown in Figure 6. If the power is
less than 20%, please continue to use after plug in charger. This instrument
can be used during charging.
Figure 6 check power
5. Main interface
After boot 3 seconds the instrument automatically enters the micro-water
main interface, as shown in Figure 7.
Figure 7 main interface
The left of main interface are touch keys, including "Calibration", "Save",
"Read", "Communication", and "Temperature", the user can select different
keys as needed; the main interface on the top real-time display dew point
value and volume ratio of SF6 gas ; the middle part dynamic display dew point
measurement curve; below with clock, battery power display.
6. Start to measure
After enter the main interface, the instrument automatically starts to
measure, adjust "flow adjustment" knob, the flow indication at the 0.6L/min or
so. The instrument real-time displays measurement curve, as shown in Figure

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7. Observe "status indicator" light, when the "status indicator" light flashes,
indicate that the instrument is self-calibrating, when "status indicator" light from
flashing to normally on state, indicating the instrument self-calibration is
completed, can read value at this time.
The instrument can simultaneously display dew point value, volume ratio
and measuring curve during the measurement, the main interface on the top,
the first data is "dew point value", the unit is ℃; the second data is "volume
ratio", the unit is uL / L , meaning the same as ppmV.
Note: The first time boot, the time of the sensor self-calibration is slightly
longer, usually 8 ~ 10min, if continuous measurement, do not turn off midway.
After entering the measuring mode, the measuring time of dew point value is 3
~ 5min.
Description: ①If "status indicator" light is normally on state, and the
dynamic measuring curve on the screen was completely become a straight line,
indicating that the data was stable, can read the data;
②During the measurement, do not press any keys, to complete the
measurement as soon as possible, save gas, save the measuring time;
③a sample measurement is completed, continue to measure next
sample, during this process do not have to turn off the power supply, directly
switch to the detected gas;
④general gas can be directly discharged into the atmosphere, for the
toxic, flammable and explosive gas and precious gas should be properly
handled;
7. Dew point calibration
This machine with calibration function, if the user has standard gas, can
calibrate the sensors on their own
Click on "Calibration" button to enter the "dew point calibration" interface,
the "dew point calibration" screen as shown in Figure 8.

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Figure 8 dew point calibration
Click on the left and right arrow keys to input the "Range" and "Zero" data,
click on "Confirm", the new calibration coefficient is stored in the instrument,
the instrument will calculate the dew point value according to the new
coefficient; Click "Cancel", "Range" and " Zero " data will recover previous
saved data; click" Return "to return to the main interface.
8. Save
Click on "Save" button to enter the "Save" interface, the "Save" interface
as shown in Figure 9.
Figure 9 save
Click on the left and right arrow keys to select data storage position, the

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instrument can store up to 100 data. After selected save position click
"Confirm" to save the data; click "Cancel", the save position back to "00"; click
"Return" to return to the main interface.
9. Read
Click on "Read" button to enter "Read" interface, the "Read" interface as
shown in Figure 10.
Figure 10 read
Click on the left and right arrow keys to select the read data position, click
"Confirm" to display the saved data. Continue to select the read data position,
click on "Confirm" to display the next data. Click "Return" to return to the main
interface.
10. Communication
Click on "Communication" button to enter "communication" interface, the
"Communication" interface as shown in Figure 11.
Connect one end of RS232 serial port cable to RS232 interface and
connect the other end to the computer serial port, click on "Start", using the
supplied PC software, can achieve communication between the instrument
and the computer. Details please refer to "VIII software operation" section.

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Figure 11 communication
11. Temperature
Click on "Temperature" button to enter the "Temperature" interface, the
"Temperature" interface as shown in Figure 12.
Figure 12 temperature
The interface displays the current temperature value. Click on
"Temperature Calibration", the instrument into the "Temperature Calibration"
interface, as shown in Figure 13.

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Figure 13 temperature calibration
The operation method of temperature calibration is same with dew point
calibration, no description here.
12. Time calibration
Click on clock icon to enter the "Time Calibration" interface, the "Time
Calibration" interface as shown in Figure 14.
Figure 14 time calibration
The operation method of time calibration is same with dew point
calibration, no description here.

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VIII. Software operation
1. Software function introduction
The software is used to synchronize the data from instrument to the
computer for further analysis and processing.
2. Software features
(1) Green software, no need to install.
(2) RS232 and USB two communication methods.
(3) Support Windows series operating system, running fast, easy to use.
3. Software running environment
Hardware requirements: CPU Celeron 533 or better, 512MB or better,
1GB or better the memory available hard disk space.
Support software: Windows98, Windows2000, Windows XP,
Windows2003, Vista, Windows and other Windows7 series operating system;
Office Microsoft 2000 and above version (must contain Excel).
4. CD files
Open the random configuration CD, copy to the local computer folder, the
file directory as shown in figure 15.
Figure 15 CD catalog
1:USB Driver
2MSCOMM32.OCX is required for the system.
3Running file of the program of the test instrument, double click can run
the program.
4Instruction manual.
5. Computer communication connection line using method

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(1) Serial data line or USB data line: connect the instrument and the
computer serial port or USB interface, to ensure the stability of the connection.
(2)USB data line: install the USB driver program before use and detailed
installation steps, please refer to the "6, software instructions" “(10) USB driver
installation instructions ". To install the USB driver, need to re plug the USB
data cable.
6. Software instructions
(1) Run the software, as shown in figure 16
Figure 16 software interface
Note: if the software is first run in Vista, Windows 7 or higher version of
the Windows system, please ensure that you have administrator privileges to
run the program (right click “HWS software.exe”, choose “Run as
Administrator”); If the antivirus software prompts the file to be at risk, click
"allow the program to run".
(2) Use the serial data line or USB data cable to connect computers and
instruments. The instrument on, enter the communication interface, as shown
in figure 11.
(3) Click the "communication connection" button, the computer and the

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instrument online, at this time there are the following two cases:
Online success: as shown in figure 17. On line success, the window below
shows "online success", button color turns green, while displaying the
corresponding communication port type (serial /USB).
Figure 17 Online success
On line failure: as shown in figure 18. Prompt for "on line failure".
Figure 18 On line failure