Waters HPLC - Page 177

B-3
Time or operator
controllable switch
closures
Four controllable switch closures to ground. Open
collector terminals pulled up to +5 VAC through 10 K
ohm resistors. Can be pulled up to 12 VAC.
Maximum allowable current = 1.0 A total. Maximum
allowable voltage = 12 VAC. Outputs are controlled
directly from keyboard or events program.
Two modes available from keyboard and events
program:
• ON = Switch closed to ground.
• OFF = Switch open (+5 VAC to ground).
Additional mode available from events program:
• Pulse = Single contact closure to opposite state for
100 ms.
Auxiliary power
supply
12 VAC to ground fused supply. 1.3-A maximum
current.
Hold output One open connector switch closure to ground.
Maximum current sink 40 mA. Low output indicates
pumps stopped due to:
• Exceeding high pressure limit
• Below low pressure limit
•Abort input
• Startup condition
Used to communicate with Hold input on Waters
autoinjectors or other compatible inputs to prevent
further injections.
Chart output
(analog signal)
Two terminals (+, –) for recording pump flow rate
traces or monitoring solvent composition (10-mV
output).
Press output
(analog signal)
Two terminals (+, –) for recording pump pressure
traces (10-mV output).
Ground terminals Connected to signal ground used as reference for
outputs (Hold, INJect, and switches S1 to S4), inputs
(Inject and Abort), or 12 VAC power supply (not for
use with 10-mV outputs).
Electrical specifications (Continued)
Item Specification