Waters Alliance 2790/2795: Column Heater and Sample Temperature Control

Commands and Tips for Third-Party Devices
Waters Alliance 2790/2795: Column Heater and Sample Temperature Control

For information about the standard commands for temperature control, refer to Temperature Control.

In addition, the following properties allow you to determine, e.g., the maximum allowed deviation of the actual temperature from the expected temperature:

Property	Min	Max	Default	Description
MaxTempDeviation²	0°C	10°C	5°C	If the actual column temperature deviates from the expected temperature by more than the set value, an error message appears. The following setting is required on the instrument: Follow the description in the instrument's manual to set the Column Temperature/On error field to Alert User, Stop Funct, or StopFlow. For the column oven, this setting is made on page 4 (Column); for sample temperature control, it is made on page 2 (Sample).
Ready²	NotReady	Ready	Ready	Indicates the state of the column heater. The column heater is Ready when temperature control (TempCtrl) is Off or when the difference between the actual temperature and the target temperature is equal or less than 2°C for at least 30 minutes.
Temperature.Nominal²	20°C (4°C)	60°C (40°C)	20°C	Sets the target operating temperature (sample temperature control). The temperature must be at least 5°C above ambient.
Temperature.Value²	0°C	80°C		Indicates the actual temperature. (The property is read--only.)
TempCtrl²	Off	On	Off	Sets the state of the temperature control. (Temperature control is active only if TempCtrl = On.)

Note:

For better understanding, [°C] is used as unit, even though [K] would be correct to indicate temperature differences.

Tip:

² The temperature control commands of the column oven can be used only if an injection is made. In all other cases, e.g. for Blank Run Samples, an error message appears.

It is not possible to change the MaxTempDeviation setting during an injection, during gradient runs, or at negative retention times.

The standard relay commands are available to control the relays of the Waters Alliance 2790 and 2795 HPLC modules (refer to Practical Tips for Device Control Relay, TTL, and Remote Input Commands).

For information about how to install the Waters Alliance 2790 and 2795 HPLC modules, refer to Hardware Installation Waters Alliance 2790/2795 HPLC Modules: Installation in the Administrator Help section.