Chromalox 1603 User Manual download pdf (Page 9)

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RTD INPUTRTD INPUT

RTD INPUT

Fig. 4 RTD CONNECTION

SAFETY NOTESSAFETY NOTES

SAFETY NOTES:

1) Do not run input wires together with power line

cables.

2) Pay attention to the line resistance; a resistance

higher than 20 Ω/wire may cause measurement

errors.

3) When shielded cable is used, it should be

grounded at one side only to avoid ground loop

currents.

4) The impedence of the 3 wires must be the

same.

RTD

9 8

RTD

Log. input 2

LOGIC INPUTLOGIC INPUT

LOGIC INPUT

SAFETY NOTE:SAFETY NOTE:

SAFETY NOTE:

1) Do not run logic input wiring together with

power cables.

2) Use an external dry contact capable of

switching 8 mA, 8 V DC.

3) The instrument needs 300 ms to recognize a

contact status variation.

4) The logic input is

NOT NOT

NOT isolated by the

measuring input

Fig. 5 - LOGIC INPUT WIRING

The logic input can be programmed as:

A) Set point selector

A.1) In this case it will operate as follows:

logic input operat. set point

open SP

close SP2

B) Start timer

In this case it will operate as described at

paragraph 5.10 (Timer modes description).

1601-03-1-CX.pmd 13/01/2004, 10.423

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Chromalox 1603 User Manual Page 9

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