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Thermo Fisher Scientific Alpha TDS 200 User Manual

Page 29

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9 RELAYS

The TDS 200 features two SPDT non-powered relays; rated for 6A at 110 VAC, 250 VAC
maximum. When your process exceeds the set parameters of a relay set point, the REL
1 or REL 2 indicator lights up.

To set parameters for relay one and relay two, see Setup programs P1.0 and P2.0.

10 TRANSMITTER FUNCTION

If remote data logging is required, a 4-20 mA current loop can be connected. The current
will be proportional to the TDS value displayed on the panel and according to the
measurement range selected.

TDS Range

Range No., R

Cell Constant

4 mA current

20 mA current

0.00 – 10.00 ppm

1

0.1

0.00 ppm

10.00 ppm

0.0 – 100.0 ppm

2

0.1

0.0 ppm

100.0 ppm

0.0 – 100.0 ppm

3

1

0.0 ppm

100.0 ppm

0 – 1000 ppm

4

1

0 ppm

1000 ppm

0.00 – 5.00 ppt

5

1

0.00 ppt

5.0 ppt

0.00 – 10.00 ppt

6

1

0.00 ppt

10.0 ppt

0.0 – 100.0 ppt

7

1

0.0 ppt

100.0 ppt

0.0 – 100.0 ppt

8

10

0.0 ppt

100.0 ppt



The 4-20 mA current loop can drive a load resistance of no more than 200 Ω.