Waters ACQUITY UPLC Operator's, Overview And Maintenance Manual page 16

For each column in a two- or four-column configuration, you can use an active
preheater. In the two-column configuration, the column manager supports
guard columns or filters. When the column manager is configured for four
50-mm columns, you cannot use guard columns or filters (see
ACQUITY UPLC 30-cm column heater/cooler (ACQUITY UPLC 30-cm
CHC)
The ACQUITY 30-cm column heater/cooler is a combination
forced-air-convection heater and cooler with a temperature range of 20 to
65 °C.
30-cm column heater/cooler:
The ACQUITY UPLC 30-cm column heater/cooler offers these features for
ease of use:
• Adjustable column clips that slide, for easy column mounting.
• Extended column compartment that allows for the use of two 300-mm
columns, with column guards; four 150-mm columns, without column
guards; or six 50-mm columns, without column guards.
• Grommet in the column mounting plate, for attaching a calibrated probe
(thermistor) for validation.
12
page 10).