ZHYQ GND15 User manual
Instruction manual
Thank you for purchasing an in-line refractometer. This instruction manual is designed to guide you to understand
the functions and characteristics of the sensor. Before using the instrument, please read this manual carefully to
ensure safe and correct use. Please keep this manual for future reference
In-line Refractometer
Model : GND15（high temperature Application）
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The In-line Brix-Monitor GND15 is a refractometer that detects the Refractive Index of a sample and outputs the
Brix(%) value on the display , can also transmit measured data to external devices via 4 to 20mA or RS485 .
GND15 series has the function of automatic temperature compensation according to the temperature of the tested
medium , when the tested medium temperature changes , the Brix value ( soluble solids ) after temperature
compensation is displays and the output changes accordingly . This product is designed for medium and high
temperature (90~150 degrees C) applications . with a water cooling device, one is the water inlet pipe and the
other is the water outlet pipe, through the water circulation to reduce the temperature of the liquid contacting our
mirror, which can solve the impact of excessive temperature on the product accuracy and the damage to PCB .
The rapid flow of the medium is driven by external equipment, and the temperature of the heat source of the
liquid-contacting part of the measuring instrument is brought out with the flow of the medium, so that the
temperature of the liquid-contacting part of the measuring instrument can be reduced to the range that the
instrument can withstand; the cooling medium can be cold gas or Corrosive clean cold water; the equipment that
drives the cooling medium can choose a suitable air pump or liquid pump according to the form of the medium.
The flow rate of the pump to drive the cooling medium should not be lower than 0.5m/S, and the pressure should
not be higher than 0.6MPa; At the same time, pay attention to the sealing of the cooling medium installation pipe,
and must not leak the liquid cooling medium into the electrical part of the product shell.
Note: Since the type in-line refractometer is equipped with a water cooling device, the temperature value on the
LED panel shows the temperature value after cooling by the water cooling device. If the temperature needs to be
accurately measured at the same time, the product with the water cooling device structure is not suitable.
Description
In-line Refractometer
Model : GND15（high temperature Application）
Water cooling principle
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If the Refractive Index of air under atmospheric pressure is 1, then when
light enters medium χ, the ratio of the sine of the incident angle α
measured against the phase boundary to the sine of the refracting angle
β is called the Refractive Index of the medium χ.
The Refractive Index varies with the wavelength of light and
temperature and is represented as follows:
For example: Refractive Index of water at 20℃under the D-line is: = 1.33299: , (Generally expressed as
nD = 1.33299.)
n ：Represents the Refractive Index
t ：Temperature (℃)
D ：D-line of natrium (589nm)
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Working Principle
In-line Refractometer
Model : GND15（high temperature Application）
Automatic temperature compensation
Lightweight , compact and easy to install on site .
LED display ,
Easy to operate, easy to connect with other devices for automatic control
Inline real-time monitoring and control of liquid substance concentration in various industries
suitable medium and high temperature (90~150 degrees C) applications
Cutting oil , mold release agent , quenching liquid , cleaning liquid , emulsion in the machining industry
Chemicals and allied , pulp & paper , tobacco , environmental protection
Biorefining , Metals and mining
Food industry , Dairy , Beverage industry , Fruit and effect processing
Starch sweetener , Sugar and sweeteners
Water-based solutions
In factories that produce liquid products such as beverages, medicines, chemicals, etc., the raw materials (stock
solution) must be processed in multiple processes, or two or more mixed solutions must be added through multiple
production lines and multiple processes, such as: juicing, filtering , cooking, dilution, blending, mixing, fermentation,
etc., each process, the concentration will change. If only detectthe finished product concentration, when there is a
substandard product, it is impossible to know which process has the problem, and the produced defective product
causes cost waste. Therefore, an online refractometer is installed on the production line (production pipeline, tank)
of each process. , It can continuously detect the concentration of samples in the pipeline in real time, monitor the
quality of samples in each process, and discover unqualified products in time, which can reduce production costs,
improve the pass rate and product quality. cost, improve inspection efficiency, real-time display of brix value , and
intuitively guide production personnel to operate.
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Why need to install in-line refractomter ?
Applications
Features
In-line Refractometer
Model : GND15（high temperature Application）
Model:
GND15
Measure Parameters:
Refractive index(nD), Brix (%), Temperature (°C)
Measure range:
0-15% , 0-33% , 0-53% , 93%
Min Resolution Ratio:
Brix: 0.1% ( Range for 15% , 33% & 53% )
Brix: 0.5% ( Range for 93% )
Measurement Accuracy:
Brix:±0.1%,
Brix:±0.3% (standard )
Measurement Temperature:
0-150℃(Automatic Temperature Compensation)
Operating current:
≤200mA
Display menu:
Refractive index(nD) , Brix(%), Temperature (°C)
Output :
4-20mA , 4-20mA+ RS485 optional
Power:
12-24V DC
Wetted parts material:
Prism: sapphire, Prism stage: SS304 , SS316L (can be customized)
Optical source:
LED(the wave length approximate to D line)
Max Pressure:
1MPa
Environment Temperature:
0-120℃
Protection grade:
IP67
Instrument Size:
306.5mm*120mm*120mm
Process connection
3” tri-clamp , other size supply free adaptor
High and low limit settings
Buttons can be set
Recorder output cable
2M ,3M ,5M,10M optional
Temperature sensor
Thin film platinum sensor
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Specification
In-line Refractometer
Model : GND15（high temperature Application）
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Dimension
In-line Refractometer
Model : GND15（high temperature Application）
Prism ①: Corrosion resistant optical glass, with a polished surface to reflect light.
Outlet ②: the cooling medium outlet from this tube
Inlet ③: the cooling medium inlet from this tube
Radiator ④: Disperses heat when measuring high temperature samples to prevent the electric circuit from
overheating.
2-pins plug ⑤: for unit power (24VDC)
4-pins plug ⑥: for output ( 4-20mA or 4-20mA+ RS485 ) , connect to a recorder.
Note: our GND15 as no power switch. Turn off the power (DC24V) prior to connecting cables to the individual units.
When power is supplied to the GND15 , The Brix(%) value will be displayed when sample flows onto the prism
surface, the measurement value display illuminates , the unit work commences. If there is no sample on the prism
surface (only air), the error message [LLLL] will be displayed.
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Names and Functions of Components
In-line Refractometer
Model : GND15（high temperature Application）
①Measurement brix value display : Digitally displays the measurement value [Brix(%)], setting mode, and
other setting values.
②Measurement value display : Digital switch displays the measure value [ nD and T]
③Menu: Switches or sets the display mode of the measurement value and the setting mode, and save the
setting value .
④ESC: Exit key
⑤︿：Up keys ：Increase the value in each setting mode.
⑥﹀：Down key: decrease the value in each setting mode .
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Names and Functions of keys
In-line Refractometer
Model : GND15（high temperature Application）
In the measurement interface, press Menu to enter the first level menu, and ESC to return to the measurement
interface. Under the first level menu, you can use the up and down keys to select the corresponding options. When
you press Menu, you will enter the second level menu. The up and down keys will adjust the corresponding
options. After adjustment, press Menu to save the settings and return to the first level menu. After adjustment,
press ESC to not save and Return to the first level menu.
First level menu
Second level menu
1
Measurement interval
4,6,8,10 S
2
Calibrate 0
Calibration 0 returns to the main page successfully, EE0 is displayed if it
fails
3
Brix corresponding to the upper limit
of 20mA in the current 4~20mA
Default value depend on the measurement range
4
Decimal places
0 , 1 , 2
5
Display temperature, refractive index
or polling display
1=temperature, 2=refractive index, 3=polling display
6
Mode-S measurement stability
1, 2, 3, 4, 5 total 5 gears
7
Temperature correction in units of 0.1
Increase or decrease by 0.1
8
Brix corresponding to the lower limit
4mA in the current 4-20mA
Default 0%
9
Temperature 4-20mA upper limit 1 as
the unit (Reserved functions)
Increase or decrease the upper limit of the solution 4-20mA output by 1.
When the temperature value is greater than or equal to the upper limit,
the output is 20mA, and the value range is -10-130
10
Temperature 4-20mA lower limit 1 as
the unit (Reserved functions)
Increment or decrement the lower limit of the 4-20mA output of the
solution by 1, when the temperature value ≥ the upper limit, the output
4mA, the value range is -10-130
11
The alarm high limit is 1 as the unit
When the measured concentration exceeds the high limit, the display
flashes quickly, and the value range is 0-100 When the setting value is
greater than 95, it is equivalent to turning off the alarm output
12
Alarm low limit 1 as unit
Increase or decrease by 1 when the measured concentration is lower
than the low limit, display
Slow flashing, when the set value is less than 0, it is equivalent to
turning off the alarm output
13
Device ID address
Default is 1
14
Reset
Return to the main page after successful reset, display EE1 on failure
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Button definition and operation
In-line Refractometer
Model : GND15（high temperature Application）
Step ①: Wipe the prism surface clean before starting the measurement
Step ②: Connect the power to GND15 the measurement starts .
Step ③: Calibrate 0 with distilled water ( The factory Settings of the product have been validated )
Step ④: Install well our GND15 on the location that needs to be measure .
Step ⑤: When the sample flows into the prism surface
Step ⑥: measurement starts , brix (%) value and current temperature T will be displayed .
Boot displayNo solution display Brix exceeds the measuring range ay
Normal measurement display nD & T polling displayCalibration 0 failure display EE0
You can choose to display only T
or nD or both through the menu.
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Operation instructions
Screen display code definition
In-line Refractometer
Model : GND15（high temperature Application）
①Install the GND15 so that the prism surface is at a
right angle to the ground.
②Attach the flow pipe to the GND15 with
O-ring (accessory) inserted between them, and fasten
them together with the clamp band (accessory).
③The prism surface may become contaminated with
solids, dirt and/or grease. If this happens, the prism
surface must be cleaned by hand.
④2 PU pipe connect with inlet and output separately
Note : Cleaning the Prism instruction in the next page
The sample inlet unit should be installed in such a
manner that it can be easily removed to allow access
to the prism for cleaning
Note : Suspending the GND15 (2.5kg) when using the
sample inlet unit to connect to the piping is dangerous ,
Use of the optional stand is recommended.
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Mounting procedure:
In-line Refractometer
Model : GND15（high temperature Application）
◆The installation form of this product is a hoop quick-installation type;
◆When installing, please pay special attention not to scratch the prism and probe;
◆When installing, please pay special attention to avoid strong impact on the instrument;
◆When installing, please pay special attention not to miss the sealing ring;
◆Ensure that the cable is correctly connected to the port;
◆The power can be turned on only after the product is installed;
◆Immediately turn off the power (DC24V) if the unit begins to overheat, smoke or emit an abnormal smell.
Small curve pipe Neck to increase flow rate pipe Normal curve pipe
Digester with scraper and steam Container
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Mounting Precautions
Mounting type
In-line Refractometer
Model : GND15（high temperature Application）
Big pipe There-way pipe
◆If the sample solution could potentially stain the prism, immediately clean the prism after measurement .
◆Before running hazardous substance(s) through any precautions should be taken to ensure the safe handling of
the hazardous system, necessary substance(s). If using a sample inlet unit, use caution when disconnecting the
GND15 .
◆Cleaning liquids up to 150℃can be used for CIP or SIP . The cleaning liquid can be used safely for 30 minutes
at one time. The momentary difference between the sample liquid temperature and the cleaning liquid temperature
must be no more than 80℃. When using cleaning liquids at temperatures over 150℃, the power source (DC24V)
must be turned off.
◆Detach the clamp band that connects the main unit to the sample inlet unit, piping or tank.
◆Clean the prism surface carefully with a soft tissue soaked with warm water or ethyl alcohol. If the sample
solution contains oil or grease, use ethyl alcohol
to ensure the prism surface does not develop a film. Development of a film on the prism could cause erroneous
measurements.
◆NEVER clean the prism with an abrasive material.
◆Cleaning the prism with an abrasive material could cause scratches on the prism which could lead to erroneous
measurements.
◆After cleaning is complete, re-attach the GND15 unit to the sample inlet unit, piping or tank. The procedure is
described on the instruction manual.
Note :we also can supply Auto or manual washing device for optional, if need , Please specify when
confirming the order
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Cleaning the Prism
In-line Refractometer
Model : GND15（high temperature Application）
◆If the unit begins to overheat, smoke, or emit an abnormal smell , immediately turn off the power and unplug the
unit from the power supply.
◆DO NOT measure any sample that can damage the prism or the sample inlet unit , sample temperature should
be kept between 5℃and 100℃when the power is turned on .
◆Do not put the instrument in a damp place, Maximum average relative humidity: 95% RH (25℃);
◆Atmospheric pressure: 80kPa ~ 106kPa;
◆Places where there is no corrosion or destruction of insulating gas, steam or dust;
◆Use the instrument at altitudes below 2000 meters (altitude).
◆Use the instrument indoor.
◆Do not change the ambient temperature of the instrument suddenly
◆Do not use instrument in areas with large amount dust and strong vibrations
◆Do not put the instrument in low temperature place
◆Do not put heavy objects on the instrument
◆Do not install the instrument In direct sunlight or near the heating source.
If measurement of concentration transmitter is abnormal, please check input power supply first. If power supply is
ok, check if the measurement window of transmitter has been covered by contamination or not, and make sure
that measurement window can contact solution well at the mean time. If it is problem of transmitter itself, please
return it to the factory for maintenance.
◆Protected from direct rain and snow, the packaged transmitter can be applied to various modes of
transportation, such as water, land and air transportation.
◆The packaged transmitter can be stored for more than 12 months with temperature ranging from -40℃~60℃,
and relative humidity less than 90%
◆Live plug-in and pull-out should be strictly prohibited under live working condition, otherwise, it will damage the
concentration and infrared transmitter easily.
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Environmental conditions:
Breakdowns And Trouble Shooting :
Caution :
In-line Refractometer
Model : GND15（high temperature Application）
2-pins plug for unit power
(24VDC)
Pin1: 24V Power+ (V+): Red
Pin 2: 24V Power- (V-): Black
4-pins plug for output
( 4-20mA )
(4-20Ma +RS485)
Pin 1: 4-20mA+ (I+): Red
Pin 2: 4-20mA- (I-) , Black
Pin 3: RS485B , Yellow
Pin 4: RS485A , Green
with * are required, with --- is optional
Model
Range
(%)
Output
Process
connection
Electric
connection
Accuracy
Other requirement
GND15
*
*
*
*
*
---
Example: GND15-33%-4-20mA-3” tri-clamp- 4pins -0.5%
5-6F No.8 Building No.115 ,Lane 1276 Nanle Road Songjiang District Shanghai 201600 China
Tel:+86-21-51691919 67755189 Fax:+86-21-67755185
E-mail: info@zhyqsensor.com
www.zhyqsensor.com
Shanghai Zhaohui Pressure Apparatus Co., Ltd.
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Ordering Guide:
Plug wiring definition:
In-line Refractometer
Model : GND15（high temperature Application）
Product and accessories :
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