Hach SIGMA 900 Bedienungsanleitung PDF herunterladen (Seite 17)

Section 3

Page 17

8544install.fm 12 V dc

• 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.

3.10 Auxiliary Connection

The auxiliary interface connector is a general purpose input/output port. Each

signal is described in

Tabl e 2 .

Table 1 12 V dc Connector Pin Assignments

Pin Signal Description

A ground

B 12 to 17 V dc unregulated

Table 2 Auxiliary Pin Assignments

Pin Signal Description Wire Color Purpose Rating

A 12 V dc White

This pin can be used to power an external device or flow meter. Must

be used in conjunction with Pin B (ground).

13.8 V dc

nominal

B ground Blue

Connected to dc ground and is isolated from the earth ground found

in the ac power line.

C Flow Pulse Input Ye l l o w

With the sampler is 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 count. The

sampler is capable of accumulating from 1 to 9999 input pulses.

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).

5 to 17 V dc

pulse with

duration of

at least

25 ms.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 51 52

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