Geotech GT-HR User manual

Model GT-HR
Operation Manual
Multi-function Readout
Copyright Ⓒ1993-2018 Geotech Cooperation. All right reserved. Doc Rev 1.2 (2018/03/31)
2F., No.200, Sec 3, Datung Rd, Xizhi Dist
New Taipei City 221, Taiwan (R.O.C)
Geotech Science Cooperation Ltd

Notes on use of product
•For safe and efficient use of the product, please read carefully the following
instructions before starting any operation.
•Any use of the product other than the one described in this manual shall be
considered the user’s full responsibility.
•The same applies for any unauthorized modifications.
•In addition to the hereby listed standards, the user must comply with the provisions of
the current legislation regarding personal safety and health together with all other
persons in the workplace.
•GEOTECH is not responsible for any accident, breakdown or other problems due to
lack of knowledge and / or non-compliance with the requirements contained in this
manual. Check that the product has not been damaged during the transport.
•Verify that the package includes all items as well as any requested optional
accessories; if anything is missing, please promptly contact GEOTECH.
•The user must strictly follow all the operations described in this manual.
•Maintenance or repair of the device is permitted only by authorized operators.
•These operators must be physically and intellectually suitable.
•For information about instrument or to order spare parts, always specify the product
information which can be found on the identification label.
•When replacing parts, always use ORIGINAL SPARE PARTS.
•The manufacturer reserves the right to make either technical and / or commercial
changes without prior notice.
•It is our policy to keep manuals continuously updated.
Instruments can be identified
•From a production lot number (written on the Compliance Certificate)
•From a serial number (s/n) engraved indelibly on the instrument
•From a label on the instrument
•From a label on the cable

GT-HR Multi-Functional Readout
Package includes

Table of Contents
Notes for Using the Product............................................................................................................1
GT-HR Front Panel............................................................................................................................... 1
Product Introduction .........................................................................................................................3
Accessories ............................................................................................................................................4
Battery ..................................................................................................................................................... 5
How to Charge the Battery ..............................................................................................................5
Taking Care of Lithium Battery.......................................................................................................6
Operational Instructions...................................................................................................................7
Front Panel Controls.................................................................................................................7
1. “Up” and “Down” Keys ..............................................................................................7
2.”Left” Key .........................................................................................................................7
3.”Right” Key ......................................................................................................................7
4.”Enter”Key .......................................................................................................................7
5. Key Note .........................................................................................................................8
Operational Diagram................................................................................................................ 8
Main Menu ...................................................................................................................................9
1. DC Voltage Measurement.................................................................................10
2. AC Voltage Measurement .................................................................................12
3. Vibrating Wire Type Measurement................................................................13
4. Current!Measurement.........................................................................................15
5. Language Selection.............................................................................................16

GT-HR Multi-Functional Readout
1!
Notes for Using the Product
For safety and convenient operation, please carefully read this user manual before using
the product.
GT-HR Front Panel
Display
Keypad
Charge Light
Power Light

GT-HR Multi-Functional Readout
2!
Label
Battery Housing
On/Off Switch
“Sensor” Connector
Micro USB Charger
Connector

GT-HR Multi-Functional Readout
3!
Product Introduction
GT-HR Multi-Functional Readout (Herein called GT-HR) is an instrument designed to
provide precise readings of any kind of sensors including DC-voltage, AC-voltage, and
Vibrating-Wire type sensors. It is suitable for measuring sensors such as strain gages, LVDT,
piezometer, tiltmeter, load cell, EL-beam, DSM sensor, etc. While measuring the reading of
a sensor, GT-HR could transmit an excitation voltage, and could directly read feedback
voltage as reading from sensor. Thus, the data of sensor, site temperature, and current
battery capacity could be measured and displayed on its screen. The user could select and
display the language in Traditional Chinese or English. GT-HR also has LED backlight display.
For different kind of sensor, the user should select the excitation voltage. For vibrating-wire
related measurement, GT-HR has 6 position switches, and temperature measurement. It is
powered by lithium battery, which could be charged by using USB Micro connector. The
long standby time and short charging time allow this instrument to be conveniently used
on the construction site.
GT-HR could generate DC and AC excitation voltages, which could be set at 2.5V, 5V to 12V.
The output voltage reading of sensor is then measured and displayed on the screen.
Besides that, GT-HR could also provide current measurement for 2-wire 4-20mA sensors.
For this measurement, 12V DC excitation will be excited to sensor, and the respective
output current from sensor will be measured. For vibrating wire sensor measurement,
6-types of position modes (A-F) are selectable for measuring different types of sensors.

GT-HR Multi-Functional Readout
4!
Accessories
The following accessories are come up with GT-HR:
1. A MicroUSB charging cable (Figure 1)
2. An AC Power Adapter with DC-5V,1A output (Figure 1)
3. A set of alligator cables and ground (Figure 2)
Figure 1 AC Power Adapter and Micro USB charging cable
Figure 2 Alligator cables and ground

GT-HR Multi-Functional Readout
5!
Battery
Each unit GT-HR is come with a 1000mA lithium battery. According to the test result, a
lithium battery under proper operation has a rated life for 500 or more charging cycles. The
battery lifetime is depending on design and quality of the production, normally the
capacity will gradually degrade with relative to time, or number of cycling cycles.
It is important to notice that, the depth of discharge (DoD) determines the cycle count or
the life of the battery. The smaller the discharge (low DoD), the longer the battery will last.
The condition of high Discharge (high DoD) is not good for lithium battery. Thus, to
prolong battery’s life, it recommended charging the device before the battery power level
drop to a critical power point.
How to Charge the Battery
The power could be supplied either from AC-power source by using adapter, or from
computer/PC by directly connecting Micro USB charging cable. In case USB Multi-port Hub
is used, the charging time of the device is depending on the output current of the port.
GT-HR has a charge light to determine whether the device is fully charged. Please notice
that, if the device is being used for measurement while re-charging, the battery indicator
will display 100% although haven’t fully charged yet. Please always see the charge light to
check whether the device is fully charged.

GT-HR Multi-Functional Readout
6!
Taking Care of Lithium Battery
§ The battery lifetime will be depended on the storage or operating environment
§ For first time usage, it doesn’t need to charge the battery for 8-12 hours.
§ Re-charging the battery anytime will not harm the battery, it is recommended to
recharge the battery when the battery level is drop to 30%
§ When the battery is drop to 0%, it is strongly recommended to recharge the battery
immediately, in order to avoid battery degrades substantially, and couldn’t be used.
§ Please don’t store the batteries at a place where temperature greater than 60
degrees Celsius, such as car garage, etc.
§ When storing the batteries, please put at storage where temperature is below 40
degrees Celsius and in dry condition,
§ Please don’t overcharge the battery for more than 12 hours.
§ If the battery will not use for a long time, for example 2-3 years, it would be better
to remove it from GT-HR
The current battery capacity of GT-HR is displayed in percentage when “measurement”
option is selected. The readout has an internal IC which controls the flow of electrical
current during re-charging. For prolong battery life, the electrical output current is
maintained at 500mA/HR, thus, the fastest charging process is approximately 1.5 hour for
fully re-charging the battery. The supply voltage for charging is 5V. The device has a charge
light to indicate when the battery is fully charged.
LED Color
Indicator meaning
Green
Charging process
Orange
Fully Charged

GT-HR Multi-Functional Readout
7!
Operational Instructions
Every time start up the GT-HR, the readout will display manufacture logo “Geotech” for
about 3 seconds, before entering the main menu.
Front Panel Controls
1. “Up” and “Down” Keys
§ At the main menu display option: Choose measurement item.
§ Vibrating wire measurement display option: Change position modes. For detail
about position modes please refer to Table1.
2.”Left” Key
Switch on, and switch off display background light
3.”Right” Key
Go back to the previous menu option
4.”Enter”Key
§ Select the menu item an option.
§ At measurement display, it will exit the measurement and go back to the main
menu.

GT-HR Multi-Functional Readout
8!
5. Key Note
§ Press “Enter” key, for exit measurement display and back to main menu
§ Please carefully notice the excitation voltage for connected sensor. For DC and AC
voltage measurement, user has to select the excitation voltage prior to
measurement.
Operational Diagram
Operating and Selecting Measurement Parameter
Page 1: Press “Up” and “Down” key, select language and sensor type. Press “Enter” key to
select the menu option and go to Page 2.
Page 2: Press “Up” and “Down” key to select excitation voltage. Press ”Right” key to jump
back to Page 1. Press “Enter” key to begin measurement.
Measurement display: Press “Enter” key, for exit measurement display
DC Voltage AC Voltage Vibrating Wire
Measurement
Switch on (Wait for 3 sec)
Enter main menu option
2.5V
5V
12V
Begin Measurement
Current
Measurement

GT-HR Multi-Functional Readout
9!
Main Menu
There are 5 options inside main menu as shown in Figure 3 and Figure 4 below:
1. DC Voltage Measurement (Electronic)
2. AC Voltage Measurement (Exchange)
3. Vibrating Wire Measurement (VW Sensor)
4. Current Measurement (4-20 mA)
5. Language Selection
Figure 3. Main Menu Display no.1
Figure 4. Main Menu Display no.2 (scrolled down)

GT-HR Multi-Functional Readout
10!
1. DC Voltage Measurement
§ Typical sensor for this type of measurement including LVDT and IPI
§ For Single-End Type: Connect Yellow alligator cable to sensor power input wire
(Yellow); Connect Black alligator cable to sensor common ground wire (Black);
Connect Green alligator cable to sensor signal output wire (Green);
§ For Differential Type: Connect Yellow alligator cable to sensor power input wire
(Yellow); Connect Black alligator cable to sensor common ground wire (Black);
Connect Green alligator cable to sensor signal + output wire (Green); Connect Blue
alligator cable to sensor signal - output wire (Blue);
§ Select the excitation voltage and begin the measurement (Figure 5 and 6)

GT-HR Multi-Functional Readout
11!
Figure 5 Selecting Sensor Excitation Voltage
Figure 6 Measurement Display.
§ At the top of measurement display, user could see the sensor type as well as
excitation voltage

GT-HR Multi-Functional Readout
12!
2. AC Voltage Measurement
§ Typical sensor for this type of measurement including ETI and EL-Beam
§ Connect Yellow alligator cable to sensor power input wire (Yellow); Connect Black
alligator cable to sensor common ground wire (Black); Connect Green alligator cable
to sensor signal output wire (Green);
§ Select the excitation voltage and begin the measurement (Figure 7)
Figure 7 Selecting Sensor Excitation Voltage (For AC voltage type measurement)

GT-HR Multi-Functional Readout
13!
3. Vibrating Wire Type Measurement
§ Typical sensor for this type of measurement including Strain Gage and VW
Piezometer.
§ Connect White alligator cable to sensor Red wire; Connect Black alligator cable to
sensor common ground wire (Black wire); Connect Green alligator cable to sensor
Green wire.
§ At measurement display, Press “up” or “down” key to select the position modes. For
detail please refer to Table 1.
Figure 8 Measurement Display
for VW-type sensor (A-Mode)
!
Figure 9 Measurement Display for
VW-type sensor (B-Mode)
!