UV-1900i Plus - Features

Multiple Measurement Modes

UV-1900i Plus has six basic measurement modes, which offer the optimal solution for a variety of measurements.

 

• Photometric

  Measures the photometric value at a single wavelength or multiple (up to eight) wavelengths.
   

  

• Spectrum

  Measures a sample spectrum using wavelength scanning.
  
   

  

• Quantitation

  Generates a calibration curve from the measurement of standards, and then calculates the concentrations of unknowns.

  

• 

  Kinetics

  Measures absorbance changes as a function of time and obtains the enzymatic activity values. The kinetics measurement method or the rate measurement method can be selected.

• 

  Time Course

  Measures changes over time in photometric values at a specified wavelength.

• 

  Biomethod

  Quantifies DNA or protein concentrations.

* The background color of the operation screen can also be set to white.

• Assist Function 

  The instrument assists the user to ensure that measurements
  are performed using the correct procedure.^*1
• 

• Checks whether or not baseline correction, auto zero correction or cell blank correction has been performed and informs the user if it has not been.
• 
  Informs the user if the last correction performed is not appropriate for the planned measurement.
• 
  Informs the user if the UV-1900i Plus is not ready to begin measurement and when starting measurements
  and 100 %T (0 Abs) corrections.

*1 This function can be enabled/disabled.

 

• Shutdown Function

  The shutdown function puts UV-1900i Plus to sleep after it's been used, or after a certain period of time. Putting the instrument into sleep mode limits power consumption and helps preserve the lamp.

  

  Wakeup Function

  Automatically wakes up a sleeping UV-1900i Plus at a specified time. This function eliminates the need for analysts to wait for it to warm up, allowing them to be more productive.

  
•  

Startup Validation Function

Instrument performance checks can be performed automatically　when the instrument is turned ON.^*2
This enables even more reliable instrument operation.
It can also be implemented in combination with the Wakeup function.

*2 This function can be enabled/disabled.
The performance check items that can be used with this function are as follows: wavelength accuracy (D2), wavelength repeat accuracy (D2), degradation, noise level, baseline flatness, baseline stability (drift), [EP] Control of Wavelength Accuracy (D2), and [USP] Control of Wavelengths (D2).

 

 

Network Connectivity Function

Data can now be transferred to a PC via a network. With wireless printing, multiple UV units can print from a single printer.^*3 (A router and other network equipment must be installed to use a network.)

*3 A router with a wireless function is required.
*4 Optional expanded memory is required. The instrument is not compatible with control via a network.
*5 A PictBridge-compatible printer is required.

Bar-Code Reader and Keyboard Entry Function

Sample names and numerical values can be entered by a bar-code reader or from the keyboard.
This saves time when entering sample names for a multiple-sample analysis, and prevents sample misidentification and other human errors.^*6

*6 Use a bar-code reader and keyboard with a USB connection.

High Reproducibility and Repeatability Accuracy

The photometric repeatability accuracy is 0.0002 Abs max. (0.5 Abs and 1.0 Abs). As a result, variance in the measurement results is suppressed, enabling more accurate quantitation and the detection of low-concentration samples.
The figure on the right is a calibration curve for caffeine, created with absorbance at 273 nm.
The calibration curve has an Abs = 0.0528 Conc. The lower limit of quantitation determined from the standard deviation is 0.0051 mg/L.

Note: One method of determining the lower limit of quantitation is to use ten times the standard deviation. This is an actual measured value and is not guaranteed.

No.	Absorbance of Blank Solution（273 nm）
1	-0.00001
2	0.00001
3	-0.00002
4	0.00002
5	0.00001
6	-0.00003
7	0.00001
8	-0.00004
9	0.00001
10	0.00005
Standard Deviationσ	0.000025

UV validation software (limited function edition) is included as standard. Using this software, inspections can be implemented as stipulated for 9 items in JIS and the JP. If optional UV validation software (USP/EP compatible edition) is added, examinations can be implemented as stipulated in the USP and the EP.