6
HTEC-500
5-4.
Connecting to the Autoinjector and the Autosampler
(Electrical Signal Connection)
A trigger signal needs to be sent from the online autoinjector or the autosampler to the data acquisition
unit to inform it of the injection timing. It also needs to be sent to the HTEC-500 in order to give the auto
zero signal. The auto zero works to shift the baseline to the zero level. Please connect the trigger signal
output on the autoinjector/autosampler with “signal in” of the terminal adapter located on the left side
of the HTEC-500. Please also refer to Fig. 6. There is no polarity on “signal in”. To find where the output of
the trigger signal is, please look at the user’s manual of your autoinjector/autosampler. If your
autosampler has an “emergency stop input”, please connect this terminal of the autosampler to the
pump error out on the HTEC-500 signal terminal. A non-polar contact closure signal will occur when the
pump on the HTEC-500 gives error readings (see chapter 8, page 12 for the errors). This way you can
prevent loosing samples when the HPLC pump HTEC-500 accidentally stops.
Please follow this diagram to figure out the electrical connections. The ports not s/- have no
polarity. AUTO ZERO and SIGNAL OUT 0sec are connected before installation. With this connection,
M.INJECTOR SIGNAL IN receives a signal when the manual injector is set to the inject position from the load
position and then SIGNAL OUT 0 sec sends a signal to AUTO ZERO IN. Through this signal, AUTO ZERO is
complete. SIGNAL OUT 3 sec sends a signal to the trigger port of the EPC-300 (not included in this system).
Through this signal, a chromatograph starts to be recorded. PUMP ERROR OUT is a signal port to stop the
auto sample injection from the auto sampler when the pump flow is not good. For more details, please
refer to the instruction manual for the auto sampler. PUMP PRESSURE and TEMPERATURE MONITOR are ports
to record operation condition of this system.
Connect to
EPC-300 (option) CH terminal
Autosampler emergency stop
EAS-20/Autosampler (option)
Manual injector
EPC-300 CTL terminal
EPC-300 TRG
Fig. 6 Electrical Connections
