Digital Density Meter DA-645

Digital Density / Specific Gravity Meter DA-645
Density / Specific Gravity Meter DA-645

Kyoto Electronics Manufacturing is a renowned specialist for density measurement and the only JCSS (Japan Calibration Service System) accredited supplier of liquid density standards. The DA-645 Density Meter is the result of 3 decades of experience in manufacturing Digital Density Meters and the market experience gained in close cooperation with our customers. It combines the most recent measuring technology with an intuitive user interface in a robust housing.

Highest dependability even in harsh environments
A rugged metal housing and internal high quality shock absorbers protect the sensitive parts of the instrument reliably against damage and minimize measurement errors caused by external influences. An easy to replace fine-dust filter prevents contamination of the internal parts. And last but not least: A new patented reference temperature sensor makes sure variations of the surrounding temperature do not influence the measuring accuracy.

Highest accuracy within the shortest possible time
A new optimized measuring algorithm provides reliable results within less than 30 seconds.

Sampling and drying pumps built-in
High operating comfort without any extra costs – no jumble of cables and tubing.

Easy selection of measuring parameters and measuring methods
It often makes sense to develop a measuring method suitable to measure different types of products, sometimes it is much easier and quicker to change only one parameter without having to edit and store a complete measuring method. With the DA-645 both approaches are possible - according to the individual preferences of the operator or the requirements of the standard operating procedures.

Minimization of error sources
Automatic detection of insufficient cleaning or drying prior to calibration and automatic alerts for regular system performance checks are just two examples of the built-in features the DA-645 Density Meter offers to ensure reliable and traceable results.

API degree or gravity, Brix, Alcohol
The DA-645 Density Meter shows the results directly in the desired unit. It is ideally suited for concentration determinations: Thanks to a special concentration scan function it is not even necessary to manually input concentration tables or formulas – the Density Meter can teach itself how to perform the calculation.

Well equipped for measurements at different temperatures
A calibration at one temperature covers the whole temperature range, a temperature scan function determines the volume expansion and temperature compensation coefficients automatically and heated versions of the automation units allow to measure products which are solid at ambient temperatures.

Energy-efficient
In addition to a low power consumption the DA-645 features an electronic time switch clock for the built-in thermostat. This ensures permanent immediate availability without waste of electricity.

Versatile and customizable
Several interfaces allow the connection of different peripheral devices such as keyboards, memory sticks, barcode scanners, printers, computers and different types of automation units in order to increase the degree of automation, to archive measured data, etc. 

Details

Advanced power save functions

Density meters with a built in solid state thermostat are normally permanently kept turned on during working hours as it takes some time for the cell to reach the target temperature after power on. With the DA-6XX Density Meters saving power and constant immediate availability are not mutually exclusive anymore: These instrument have a very low power consumption of approx. 40 watts and offer several energy saving functions which switch the two greatest consumers of energy - the thermostat and the display - automatically off when they are not needed. A freely configurable time switch makes sure the instrument is always ready to measure during working hours.

DA-6XX Density Meters | Power Save Functions
Auto dim function of the display
Brightness adjustment of the display
Programmable time switch for the thermosat

Automation without jumble of tubes and cables

Improper filling and insufficient cleaning of the measuring cell are the most frequent sources of error when performing measurements with digital density meters. For this reason the DA-6XX Density Meters come with built in pumps to fill, rinse and dry the measuring cell. The built-in pumps allow a semi automatic operation of the instrument. To make operation even more comfortable, the Density Meter can be fitted with a DCU-600 sampling unit which can be mounted directly onto the instrument.

For special applications like very highly viscous samples or samples which are solid at ambient temperature, a DCU-551 Auto Clean and Sampling Unit can be connected to the instrument.

DA-6XX Density Meters | Built-in sampling pump
Built-in sampling pump of the DA-6XX Density Meters (1/3)
Built-in sampling pump of the DA-6XX Density Meters (2/3)
Built-in sampling pump of the DA-6XX Density Meters (3/3)
DCU-600 Auto Sampling Unit

Correct adjustments ensured

Incorrect adjustments lead to wrong results. To avoid them, a calibration navigator does not only guide the operator through each single step of the calibration procedure but also detects insufficient cleaning prior to the calibration and the usage of a liquid which is not suitable for calibration.

Prior to the calibration with air, complete cleaning and drying of the measuring cell is required. To reliably exclude the formation of condensed water in the cell the Density Meter automatically alerts the operator when the desiccant must be replaced. When working with an automatic sampling unit, the user gets a warning when the rinsing solvents need to be replenished.

Improper cleaning after measurement can lead to stubborn residues in the cell, frequent measurements of strongly alkaline products can slowly attack the cell. Both are likely to have a negative effect on the accuracy of the measurements. These sources of error can easily be detected by analyzing the history of the calibrations and system performance checks. The DA-6XX density meters allow to display a ten years record of the oscillation frequencies measured in all the calibrations and performance checks. If required, these data can be exported to an USB memory stick and analyzed on a PC or be transmitted to the local KEM representative for assessment.

DA-6XX Density Meter | Calibration Navigator
Calibration Navigator (1/5)
Calibration Navigator (2/5)
Calibration Navigator (3/5)
Calibration Navigator (4/5)
Calibration Navigator (5/5)
Setup of the alert to replace the desiccant
Alert to replace the desiccant
Record of performed calibrations

No need to touch the touch screen

The DA-6XX Density Meters are equipped with a large touch screen which offers an easy and intuitive operation of the instrument. In certain cases, however, an operation without touchscreen is easier or even required:

  • Dirty hands or protection gloves soil the display. For this reason all the keys required to perform measurements (Start, Reset, Pump, etc.) are located outside the touch screen.
  • It can be quite time consuming to enter longer texts on a touch screen. For this purpose a standard PC keyboard can be connected to the DA-6XX Density Meters.
  • When measuring toxic samples, the instrument must be placed in a hood. In such cases the DA-6XX can be connected to a personal computer and remote controlled. No special software needs to be installed for this purpose – all it requires is a standard web browser like Firefox, Internet Explorer or Chrome.
  • To input sample names, select measuring methods or operator names, a barcode reader can be used.
DA-6XX Denisity Meters | Touchscreen
DA-6XX control panel
DA-6XX web interface

Automatic scan functions

No more need for time consuming regression calculations in order to perform temperature compensated measurements or concentration determinations: The automatic temperature and concentration scan functions of the DA-6XX density meters make the determination of concentration tables and temperature compensation formulas an easy task.

DA-6XX Density Meters | temperature scan
Automatic temperature scan function
Concentration tables can automatically be determined

Applications

Food and Beverage

  • Fruit juices (Brix)
  • Syrup
  • Beer (Plato)
  • Wine
  • Edible oils
  • Vinegar
  • Salad dressings
  • Milk
  • Cream
  • Soy milk
  • Lactic acid drinks
  • Soy sauce
  • Bouillon
  • Brine

Petroleum and Chemicals

  • Crude oil
  • Light oil
  • Kerosene
  • Gasoline
  • Organic solvents
  • Quenching oils
  • Cutting oils
  • Lubricants
  • Water sol. lubricants
  • Insulating oils
  • Hydraulic oils
  • Metal working oils
  • Rust preventive oils
  • Water sol. quenching oils
  • Antifreeze
  • Ethylene glycol
  • Propylene glycol

Standards

ASTM D1250
D1475
D4052
D4806
D5002
D5798
D5931

 

ISO 12185
15212

Pharmaceuticals, Flavours & Fragrances, Cosmetics

  • Injection solutions
  • Chinese herbal remedy
  • Eyedrops
  • Shampoos
  • Glycerol
  • Hair conditioners
  • Detergents
  • Skin toner
  • Hair tonic
  • Serum
  • Disinfectants
  • Ethyl alcohol
  • Flavors
  • Fragrances
  • Essential oils

Electronics, Surface Treatment, Power Generation, Transport

  • Plating baths
  • Paints
  • Battery acid

Technical Specifications

Measuring principle Oscillating u-tube  
Minimum sample amount approx. 1.2 mL with syringe | approx. 2 mL with pump  
Supported measuring units Density, Specific Gravity,
User defined unit such as Baumé, Twaddle, Milk Degrees, etc.
 
Measuring range

Density [g/cm³]

0.00000 … 3.00000
Temperature range

[°C]
[°F]

0.00 … 96.00
32.0 … 204.8
Limit of error 1) Density [g/cm³]
Temperature [°C]
Temperature [°F]
±0.00005
±0.03
±0.05
Repeatability 1) Density [g/cm³] 0.00001
Viscosity correction yes 2)  
Display 5.7 inch color TFT LCD; VGA (640x480)  
Display contents Density, specific gravity, oscillation frequency, temperature,
concentration and other messages
 
Sampling
  1. Manual by syringe
  2. Automatic by built-in peristaltic pump
 
Methods Stores up to 100 methods including measurement parameters,
density auto correction, concentration conversion, etc.
 
Stability Four stability modes to shorten the time required for measurement by extrapolation  
Temperature compensation
  1. By product specific temperature conversion tables or formulas
  2. By preprogrammed conversion tables for petroleum, petroleum products or lubricants according to ASTM
 
Automatic conversions
  1. Between density and concentration
  2. Conversion of the density to a reference temperature
 
Statistic reevaluations
  1. Automatic or manual calculation of mean value and standard deviation
  2. Recalculation of stored results
 
Interfaces LAN (x1) for personal computer
USB 1.1 (x2) for USB memory stick, keyboard, barcode reader, Epson inkjet printer, thermal printer
RS-232C (x2) for dot matrix printer, Auto Clean and Sampling Unit, external measuring cell, sample changer
 
Data I/O
  1. USB memory stick (flash drive)
  2. Application notes supplied on USB memory stick
 
Ambient conditions Temperature
Humidity
5 … 35 °C
85% RH max. (no condensation)
Wetted materials PTFE, borosilicate glass, SUS304  
Power supply DC 24V 5A (Main Unit)
AC 100 … 240 V | 50/60 Hz (comes with AC adapter)
 
Power consumption 40 W (max. 120 W, min 20 W)  
Dimensions 320 (W) x 382 (D) x 272 (H) mm | 12.6 (W) x 14.3 (D) x 10.7 (H) inches  
Weight 18 kg | 39.7 lbs  

1) according to KEM's standard measuring conditions
2) as well available without viscosity correction, model DA-645B

Automation

Single Sample Automation

DCU-600 Auto Sampling Unit
DCU-600 Auto Sampling Unit

DCU-600 Auto Sampling Unit

Sampling - measuring - cleaning with up to two solvents and drying: The DCU-600 Auto Sampling unit does not only automate the entire density measuring cycle, it is as well capable of performing calibrations and system performance checks automatically. Sampling is done by aspiration, for the samples different types of containers from 20 mL vials to 100 mL standard beakers can be used. Rinsing can be done with 2 solvents. During the rinsing cycle, the solvents are mixed with air. The resulting turbulent flow increases the efficiency of the rinsing cycles, which means that time required for cleaning and the amount of solvents used is considerably reduced.

The DCU-600 is a cost-effective, compact and and easy to install option for the all DA-6XX density meters, as it uses the built in sampling and drying pumps of the instrument.

DCU-551N Auto Clean and Sampling Unit for 20 ml vials
DCU-551N Auto Clean and Sampling Unit

DCU-551N Auto Clean and Sampling Unit for 20 ml vials

The DCU-551N does not only save operators a great deal of work, it enhances at the same time safety in the working place and significantly increases the reproducibility and accuracy of measurement especially when non homogeneous, highly viscous, volatile hygroscopic or toxic samples must be measured.

  • Powerful cleaning and drying of the measuring cell and the tubing after each measurement.Sampling by overpressure. Advantages:
    • High availability, low maintenance as the sampling pump is contacted by dry air only.
    • Handles even highly viscous samples with a viscosity of up to 30'000 mPa·s.
    • Automatic sample recovery

DCU-551SS Auto Clean and Sampling Unit for 8 ml vials

The DCU-551SS sample changer allows to measure samples in 9 ml vials. All the other characteristics are the same as the ones of the DCU-551N.

 

DCU-551H Auto Clean and Sampling Unit for 20 ml vials with heater
DCU-551H Auto Clean and Sampling Unit

DCU-551H Auto Clean and Sampling Unit for 20 ml vials with heater

The DCU-551H is equipped with a heater (maximum temperature 80 °C) and allows to automatically perform density determinations of samples which are very highly viscous or even solid at ambient temperature. It is the ideal solution to measure samples like paraffin or crude oils which contain big quantities of paraffin, bunker oils or grease and fats at elevated temperatures.

 

SpecificationDCU-551N, DCU-551HDCU-551SSDCU-600
Size of vials 20 mL 8 mL 20 ml vial … 100 mL beaker
Max. sample viscosity 50'000 mPa·s 50'000 mPa·s 2'000 mPa·s 
Ambient conditions 5 … 35°C
85% RH max.
(no condensation)
5 … 35°C
85% RH max.
(no condensation) 
5 … 35°C
85% RH max.
(no condensation) 

Sample Changers

CHD-502N Sample Changer with 30 positions
CHD-502N Sample Changer

CHD-502N Sample Changer with 30 positions

The CHD-502N sample changer does not only save operators a great deal of work, it enhances at the same time safety in the working place and significantly increases the reproducibility and accuracy of measurement especially when non homogeneous, highly viscous, volatile or toxic samples must be measured.

  • Automatic measurement of up to 30 samples in 20 mL vials.
  • Powerful cleaning and drying of the measuring cell and the tubing after each measurement.
  • Sampling by overpressure. Advantages:
    • High availability, low maintenance as the sampling pump is contacted by dry air only.
    • Handles even highly viscous samples with a viscosity of up to 30'000 mPa·s.
    • Automatic sample recovery.
  • Emergency sample function. A running series can easily be interrupted to measure an urgent sample.

CHD-502SS Sample Changer with 48 Positions

The CHD-502SS sample changer allows to measure up to 48 samples in 9 ml vials. All the other characteristics are the same as the ones of the CHD-502N.

CHD-502H Heated Sample Changer with 30 Positions
CHD-502H Sample Changer with heater

CHD-502H Heated Sample Changer with 30 Positions

The CHD-502H Sample Changer is equipped with a heater and has 30 positions. The samples can be heated up to a temperature of 80°C. With this sample changer it is thus possible to automatically perform density determinations of samples which are very highly viscous or even solid at ambient temperature. It is the ideal solution to measure samples like paraffin or crude oils which contain big quantities of paraffin, bunker oils or grease and fats at elevated temperatures.

CHD-502C Sample Changer with 30 Positions and cooling jacket
CHD-502C Sample Changer with cooling jacket

CHD-502C Sample Changer with 30 Positions and cooling jacket

The CHD-502H Sample Changer is equipped with a cooling jacket and has 30 positions. The samples can be cooled down with a circulating thermostat prior to measurement. With this sample changer it is possible to automatically perform density determinations of samples which are highly volatile. The CHD-502C is thus an ideal solution to measure samples like light naphta, petroleum ether, diethyl ether, etc.

 

SpecificationCHD-502N, CHD-502H, CHD-502CCHD-502SS
Number of sample vials 30 48
Size of vials 20 mL 8 mL
Max. sample viscosity
(at meas. temperature)
50'000 mPa·s 50'000 mPa·s
Ambient conditions 5 … 35°C
85% RH max.
(no condensation)
5 … 35°C
85% RH max.
(no condensation)

Software

Soft Cap Data Capture Software

SOFT CAP Data Capture Software
SOFT CAP Data Capture Software

The easy way to transfer your results directly to Microsoft EXCEL

The Data Capture Software is an easy to use and flexible solution to collect measurement results from different KEM instruments (Refractometers, Density Meters, Potentiometric or Karl-Fischer Titrators, Thermal Conductivity Meters) on a Windows personal computer.

  • Up to four different instruments can be connected to one single PC and be used simultaneously. Two of these instruments can be of the same model.
  • The results can directly be stored in EXCEL workbooks. The measured results are always available at a glance in a clear and concise manner.
    • As soon as a measurement has finished, the result appears in the corresponding worksheet.
    • The layout, order and the format how the results are stored in EXCEL can freely be adapted to specific needs.
    • Results can be automatically be processed by EXCEL macros as they are transmitted to the PC. Additional data (comments, sample data, etc.) can be entered at any time by means of the PC keyboard or a barcode reader.
  • All results can at the same time be stored in as CSV files.

System Requirements for PC

SpecificationDescription
Computer Personal computer with Pentium II CPU of 233MHz or better
Operating system Microsoft Windows 2000, XP,
Vista (Home Basic, Business), 7 (Home Premium, Professional)
Other programs Microsoft EXCEL 97 / 2000 / 2003 / 2007
RAM at least 128 MB / 512 MB recommended
Hard disc space 10 MB required for installation
Display Resolution higher than 640 * 480
Disk drive CD-ROM or DVD-ROM
Interface 1 USB port
RS-232C D-sub (male) 9 pin required for each additional instrument
to be connected to the same computer.

Accessories

Printers

IDP-100 Printer
IDP-100 Printer

IDP-100 Printer

Dot matrix ink printer for GLP compliance.

  • Dot matrix printer with ink ribbon, prints on regular paper (width 57.5 ± 0.5mm).
  • 24 digits, 144 dots per line.
  • Automatic paper end detection - no loss of data!
  • 2 kB internal buffer memory. Advantage: Less time required per measurement, as the instrument does not have to wait until the results are printed out.
DP-600 Thermal Printer
DP-600 Thermal Printer

DP-600 Thermal Printer

Thermal printer.

  • High printing speed.
  • Silent operation.

Certified Standard Reference Material

Density determination by hydrostatic weighing
Density determination by hydrostatic weighing

Liquid Density Standards

 

jcsslogo.png

 

KEM does not only have several decades of experience in producing digital density meter it also has a JCSS (Japan Calibration Service System) Accredited Calibration Laboratory (assessed on JIS Q 17025:2000 (ISO/IEC 17025:1999) where a wide range of certified liquid density standard reference material is produced. KEM has the JCSS accreditation number 0115.

The density of these standards is determined with by hydrostatic weighing using a mono-cristal silicon body (see picture) and is thus directly traceable to recognized national standards. All standards come with a certificate bearing the JCSS symbol which assures their traceability to National Measurement Standards of Japan which are recognized worldwide through the ILAC and APLAC MRA.

Although calibration with air and water is common practice, regular system performance checks using reference standards has benefits with regard to GLP compliance and traceability of the results to recognized national standards.

Density standard reference material
Certified Density Standard Reference Material

Density meters are often used to determine the ethanol content. For this reason, KEM offers a range of certified ethanol / water density standards. The ethanol standards come in three vials of 20 mL each.

Due to their measuring principle, the reading of digital density meters based on an oscillating U-tube is influenced by the viscosity of the measured sample because the oscillation of the U-tube is dampened due to the shear forces that occur in viscous samples. Modern digital density meter can automatically correct for this so called viscosity error. If frequently samples are measured having a viscosity which necessitate a correction of the viscosity error, regular system performance checks using certified density reference material having approximately the same viscosity as the samples should be performed. This is the only way to ensure the viscosity correction of the density meter is working correctly. For this reason KEM is offering certified density standard reference material having different viscosities.

 

StandardDensity (g/cm³ at 20°C)Limit of error (g/cm³)Ordering number
Water 1) 0.99821  ±0.00003  12-02708-02
Iso-octane 2) 0.691.. ±0.00003  12-03288-02
Dichlorotoluene 2) 1.249.. ±0.00003 12-03289-02
Bromobenzene 2) 1.494.. ±0.00003 12-03290-02
1) two vials of 10 mL 2) two vials of 10 mL (organic solvent | water)
StandardDensity (g/cm³ at 20°C)Limit of error (g/cm³)Ordering number
5% ethanol sol.1) 0.991.. ±0.00003 12-03536
10% ethanol sol.1) 0.985.. ±0.00003 12-03536-01
15% ethanol sol.1) 0.980.. ±0.00003 12-03289-02
20% ethanol sol.1) 0.975.. ±0.00003 12-03536-03
25% ethanol sol.1) 0.970.. ±0.00003 12-03536-04
30% ethanol sol.1) 0.964.. ±0.00003 12-03536-05
35% ethanol sol.1) 0.958.. ±0.00003 12-03536-05
40% ethanol sol.1) 0.948.. ±0.00003 12-03536-07
1) three vials of 20 mL
StandardDensity (g/cm³ at 20°C)Limit of error (g/cm³)Ordering number
Visco Liquid 5 (JCSS Certif.)1) 0.882.. ±0.00003 12-03528
Visco Liquid 20 (JCSS Certif.)1) 0.839.. ±0.00003 12-03528-01
Visco Liquid 50 (JCSS Certif.)1) 0.848.. ±0.00003 12-03528-02
Visco Liquid 100 (JCSS Certif.)1) 0.855.. ±0.00003 12-03528-03
Visco Liquid 200 (JCSS Certif.)1) 0.861.. ±0.00003 12-03528-04
Visco Liquid 500 (JCSS Certif.)1) 0.871.. ±0.00003 12-03528-05
Visco Liquid 2000 (JCSS Certif.)1) 0.879.. ±0.00003 12-03528-06
1) includes two vials of 10 mL, density standard mentioned in the table + density standard water
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