Hach-Lange SI792 P, SI792x P, SI792x P-FF, SI792x P-PA User Manual - Manual (Page 17)

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Section 3 Installation
DANGER
Explosion hazard. The installation and commissioning of this
equipment must only be carried out by trained personnel.
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
Explosion hazard. The safety of the transmitter may be impaired if
any of the following conditions have occurred:
• visible damage
• storage above 70 °C for prolonged periods
• exposure to severe transport stresses
• previous installation
• failure to operate properly
If any of these conditions have occurred, return the device to the
manufacturer for recertification.
DANGER
Explosion hazard. pHD sensors (PDxxx and RDxxx) must have a
serial number greater than 0712431582 to be used in C1D1
hazardous locations. Check the serial number of the pHD sensor
before wiring the sensor to si792x P, si792x P-FF or
si792x P-PA instruments.
The si792 and si792x transmitters differ in hazard classification. The
si792 transmitter is designed for non-hazardous or Class I, Division 2,
Groups A, B, C, D hazardous locations. The si792x transmitter is
designed for Class I, Division 1, Groups A, B, C, D hazardous locations.
Refer to the control drawing or listing applicable to the site location.