6 hart communication connection, Installation – Hach-Lange SI792 P, SI792x P, SI792x P-FF, SI792x P-PA User Manual User Manual

Page 31

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Installation

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3.6 HART communication connection

DANGER
Explosion hazard. Never connect items to the transmitter that are
not specified on the control drawing. Do not connect or
disconnect any equipment unless power has been switched off or
the area is known to be non-hazardous.

DANGER
The si792x transmitter must be used with an explosion-proof
HART communication device. Refer to the appropriate control
drawing for the location of the HART (Rosemount) device.

The handheld HART communication device can only be connected to
the transmitter in US Class I, Division 1 classified locations (permitted
only by FM). Do not connect the handheld Hart communication device
to the transmitter in any Zone or Canadian Class I, Division 1 classified
location. Refer to

Figure 4 on page 24

for the connector location.

Table 5 Terminal assignments—differential sensors

Terminal No. Assignment

Hach wire color

1

Measure electrode (pHD is Reference)

red

4

Reference electrode (pHD is Measure)

green

5

Cable shield connections (2 shield wires for
Hach pHD, 1 shield wire for Hach LCP)
Note: Do not connect to earth ground.

shield

8

RTD (resistive temperature device)

yellow

17

–6 V

white

18

GND

black

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