Dionex Detectors), the Shodex RI-101 Refractive Index Detector supports the following commands and properties (please note that the display Filter level determines which commands and properties are displayed):Shodex Refractive Index Detectors (RI-101, RI-102, RI-104): Commands and Tips
The Shodex RI-101 Refractive Index Detector is available from Dionex as part of the Summit HPLC System whereas the RI-102 and RI-104 detectors are not. However, the commands listed below are also supported for the Shodex RI-102 and RI-104 detectors.
In addition to the commands available for various detector types, such as Step, Average, and Autozero (see Dionex Detectors), the Shodex RI-101 Refractive Index Detector supports the following commands and properties (please note that the display Filter level determines which commands and properties are displayed):
|
Property |
Minimum |
Maximum |
Description |
|
Baseline_Shift |
0 mV |
500 mV |
Baseline offset (10 mV increments only). (Display level: Advanced) |
|
Data_Collection_Rate |
0.50 Hz |
10 Hz |
Enter the rate [Hz] at which Chromeleon collects digital data from the detector. |
|
DemoFileName |
|
|
Name of the standard demo file (Display level: Expert. The property is read-only.) |
|
Drift |
0 nRIU/h |
9990 nRIU/h |
Drift value (Display level: Advanced. The property is read-only.) |
|
FirmwareVersion |
"1.06" (Note: This is the version number displayed on the startup screen. Other information is not retrievable.) |
Standard firmware version. |
|
|
Integrator_Range |
125 µRIU/V or 500 µRIU/V |
Voltage scale for analog integrator output (display level: Advanced) |
|
|
LampAge |
0 h |
99999 h |
Reports the total operating hours of the lamp. Display level: Advanced. The property is read-only.) |
|
LampVoltage |
0.0V |
9.9V |
Lamp voltage (The value should not exceed 4.5V. Display level: Advanced. The property is read-only.) |
|
Noise |
0 nRIU |
9990 nRIU |
Noise value (Display level: Advanced. The property is read-only.) |
|
NotReadyCauses |
Text string (128 characters) |
Explanation of why the device is not ready (read-only). |
|
|
Polarity |
Plus |
Minus |
Output polarity (Display level: Advanced) |
|
Purge |
Off |
On |
Controls the purge valve. |
|
Recorder_Range |
0.25 µRIU |
512.00 µRIU |
Voltage scale for full-scale analog recorder output. Only powers of 2 are allowed. (Display level: Advanced) |
|
Rise_Time |
0.10, 0.25, 0.50,1.00, 1.50, 2.00, 3.00, 6.00 s |
Sets the response time of the detector upon a signal change in [s] (see also: Rise Time). |
|
|
Span |
0 µRIU |
999 µRIU |
Validation span (The value should be between 487 and 537 µRIU. Display level: Advanced. The property is read-only.) |
|
TemperatureDelta |
-99°C |
99°C |
Temperature delta (also see: Temperature.Nominal and Temperature.Value. Display level: Advanced. The property is read-only.) |
|
Temperature.Nominal |
30°C |
50°C |
Temperature set point. |
|
Temperature.Value |
0°C |
99°C |
Measured temperature. |
Message: "A communication timeout occurred while waiting for device answer in TaskGetAquData".
Possible error cause:
The error message indicates a communication error which occurs if the refractive index exceeds the maximum RI range. This error occurs with earlier firmware versions (1.09 and below).
Solution:
Upgrade the firmware to 1.10 to solve the problem.
The error occurs when running very long chromatograms (longer than 20 hours).
Solution:
With digital data acquisition the length of an analysis (any one injection) is limited to about 20 hours. Longer runs may be interrupted with a "communication timeout" error. In this case use analog data acquisition, for example, by means of a UCI-100 interface.
Further Information
For information about how to install the Shodex RI-detectors, refer to 
Shodex HPLC Refractive Index Detectors (RI-101, RI-102, RI-104).