Agilent Technologies Helium Leak Detector
50
DRAFT 12
/11/17
I/O Connector is a 25-pin female D-sub connector to interface with an external PLC via a
parallel cable.
❑ Inputs:
❑ Four level inputs: optically isolated, (+5 to+24) VDC.
❑ Four momentary inputs: optically isolated, (+5 to+24) VDC, requires 200 ms
pulse width.
All inputs are opto-isolator LEDs with a series 3300 Ohm resistor.
❑ Outputs: Eight optically isolated emitter followers with a 10 Ohm series resistor,
14 mA max drive current, +24VDC max.
❑ Power: An external power supply is supplied by the user.
A detailed summary of information related to I/O pin identifications is provided in Table A-6
on page 152.
Nitrogen Vent Port
Serial Connector A 9-pin male D-type connector to interface with an external PC via
RS-232 type communications protocol for system diagnostic or
control
A detailed summary of information related to serial communication
is provided in
Section A “Communications Protocol” on page 139.
Power Entry
Module
Provides supply power, overcurrent and EMI protection for the leak
detector. The Power Entry Module consists of:
❑ Power Input Connector - An IEC/EN60320/C20 standard,
three-prong grounded inlet connector.
❑ Power Switch (I/O) - A 20A rocker type Power
Switch/Thermal Circuit Breaker.
❑ 20 A EMC line filter.
Fore Pump Power
Connection
An IEC/EN60320/C19 standard, three-prong grounded outlet con-
nector.
Analog Output The Agilent Technologies Helium Mass Spectrometer leak detector
is equipped with a DB9F connector for the analog output. Pin #1 is
signal (positive) and Pin #2 is return (negative). Signal range: From
0 to 10 VDC
Chassis (Earth)
Ter min al
Provided for additional connection of the leak detector to the
building grounding system to improve ESD protection.
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