GX-281 Liquid Handler



Manufacturing Standards

Meets applicable safety and EMC certification standards; UL and CE certified

Arm Speed

X and Y: 0.01-600.00 mm/sec
Z: 0.01-125.00 mm/sec

Communication Interface

RS-232 or GSIOC; Four inputs (contact closure, TTL), four relay outputs, four switched +24V DC 1A outputs, one safety input and one analog input

Liquid Handling†

Reproducibility: <2%
Accuracy: ±2% for (100 µL - 25 mL) water

Front Panel

ON/OFF and STOP soft keys, LED indicator for power

Horizontal Motion Strength

X: 1.4 kg (3 lbs.)
Y: 0.7 kg (1.5 lbs.)
Z: 5.4 kg (12 lbs.)

Injection Carryover


Injection Reproducibility

<1.0% CV (total loop injection), <3.5% (partial loop injection)

Reservoir Solvents

Up to 5

Rinse Solvents

Up to 6

Rinse Speed

High: 200 rpm
Low: 120 rpm

Bed Capacity

Holds up to six Code 200-Series racks
Quantity 576 of 13 mm test tubes
Quantity 450 of 16 mm test tubes
Quantity 420 of 18 mm test tubes
Quantity 180 of 25 mm test tubes
Quantity 62 of 25 or 50 mL scintillation vials

Power Requirements

Frequency: 50-60 Hz
Voltage: 100-240V (Universal Input)
Current rating: 5.0A for 100-120V or 2.5A for 220-240V
Power consumption: 500W maximum

Probe Positioning Performance

Accuracy: ±0.05 mm in X/Y/Z dimensions
Repeatability: ±0.025 mm in X/Y/Z dimensions

Fraction Collector 3-way Valve

3-port, PTFE, 114 µL internal volume, 10 µL dead volume, up to 200 mL/min

Sampler Type

X/Y/Z with stationary rack design


Gilson TRILUTION™ Software

Solvent Delivery Dynamic Range*

 2 µL to >100 mL
*For volumes below 100 µL, Liquid Handling and Injection specifications may differ from those listed above.

Flow Rate

Up to 25 mL/min

Liquid Contact Materials

Valcon H, Nitronic 60 (N60), PTFE

Vertical Punch Strength

4.5 kg (10 lbs.)

Display Panel

Two lines of 40 alphanumeric characters, vacuum fluorescent display


68 kg (150 lbs.)


88.9 x 76.2 x 96.5 cm (35 x 30 x 38 in.)

† Contact Gilson Customer Service to learn what methods and conditions were used to obtain the values.
Test tube