Section 3
•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).
3.9 12 V dc
This connection is for supplying power to the sampler controller electronics. Power is normally supplied to the sampler controller electronics from either a battery or a power supply located in the pocket directly behind the sampler controller housing.
In the event of a power outage, an optional 12 V dc battery backup is available (Cat. No. 1803). This power backup maintains power to the sampler when ac power fails.
Table 1 12 V dc Connector Pin Assignments
Pin
A
B
Signal Description
ground
12 to 17 V dc unregulated
3.10 Auxiliary Connection
The auxiliary interface connector is a general purpose input/output port. Each signal is described in Table 2.
Table 2 Auxiliary Pin Assignments
Pin | Signal Description | Wire Color | Purpose | Rating | |
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A | 12 V dc | White | This pin can be used to power an external device or flow meter. Must |
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be used in conjunction with Pin B (ground). | 13.8 V dc | ||||
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B | ground | Blue | Connected to dc ground and is isolated from the earth ground found | nominal | |
in the ac power line. |
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| With the sampler is in Flow Proportional mode and connected to an |
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| external flow meter, a 5 to 12 V dc input pulse lasting at least 25 |
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| milliseconds will cause the sampler to decrement one count. The | 5 to 17 V dc | |
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| sampler is capable of accumulating from 1 to 9999 input pulses. | pulse with | |
C | Flow Pulse Input | Yellow | The 12 V dc line found on Pin A can be used directly with a simple | duration of | |
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| contact closure to Pin C or an external 5 to 12 V dc pulse may be | at least | |
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| applied providing the ground side of the external signal is connected | 25 ms. | |
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| to the sampler ground at Pin B. This count is actuated at the |
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| beginning of the input signal (the leading edge of the pulse). |
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| Page 17 |
8544install.fm | 12 V dc |
