Hach 900 MAX manual 2.9Auxiliary Receptacle Pin Identification, Section

Section 2

Important: Whenever electricity is present, there is a possibility of electrical shock. Before connecting the sampler to an ac power source, the following safety precautions should be taken:

•Check the power source to make sure that it satisfies the ac power requirements of the sampler.

•Make sure that all electrical installations and connections are in accordance with national and local electrical codes.

•Before performing any maintenance, disconnect the sampler from the power source.

•Do not attempt to make any connection or otherwise handle the electrical components of the sampler when connected to ac line power if the immediate area is wet, or if hands or clothing are wet.

•If the circuit breaker or fuse in the ac power source is tripped, determine the cause before restoring power to the sampler.

•Make sure the power circuit is grounded and protected with a Ground Fault Interrupter (GFI).

2.9Auxiliary Receptacle Pin Identification

Pin A/White (12 V dc)	Powers an external device or flow meter. Must be used in conjunction with Pin B (ground).
Pin B/Blue (Ground)	Connected to dc ground and is isolated from the earth ground found in the ac power line.
	With the sampler in Flow Proportional mode and connected to an external flow meter, a 5 to
	12 V dc input pulse lasting at least 25 milliseconds will cause the sampler to decrement one
Pin C/Yellow (Pulse Input)	count. The 12 V dc line found on Pin A can be used directly with a simple contact closure to
	Pin C or an external 5 to 12 V dc pulse may be applied providing the ground side of the
	external signal is connected to the sampler ground at Pin B. This count is actuated at the
	beginning of the input signal (the leading edge of the pulse).
	This line is held at 5 V dc inside the sampler. When shorted to ground (Pin B), a signal is sent
	to the microprocessor inside the sampler causing it to “wake up” and begin or resume its
Pin D/Black	sampling program. It can be used in conjunction with a simple level float to actuate the
(Liquid Level Actuator/	sampler when liquid is present or to take over after a second sampler has finished its
Auxiliary Control Input)	program. It may also be used with any device (such as a pH meter) that produces a dry
	contact output to control the sampler in response to some user-defined condition (i.e. high or
	low pH); must be used in conjunction with Pin B.
Pin E/Red (Special Output)	Normally at 0 V dc, this line goes to 12 V dc upon any of the selected events described in.
	Normally an open circuit, this line switches to ground for 90 seconds at the conclusion of the
Pin F/Green	sampling program. Used to “wake up” another sampler to take over sampling or to signal an
	operator or data logger upon the completion of the sampling program. This pin is also used to
(Program Complete Output)
	signal the bottle full condition in a single bottle/continuous mode, and will transmit the bottle #
	to an 950 Flow Meter if the program complete signal is disabled.
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Auxiliary Receptacle Pin Identification		8990hrd.fm