Hach 1735 TRO, Hazardous Location Installation Manual, Page: 7 / 46

This allows the connection of equipment in an intrinsically safe manner, even when the equipment is
not tested together. No additional certification testing is needed if each piece of equipment is
approved with entity parameters and all safety requirements are met.
All equipment connected to the instrument must have entity parameters that meet the requirements
shown on the control drawings. Be sure to include the parameters of all cables and connections.
The information on the control drawings gives directions for a safe installation. Installation reference
drawings that show suggested connections for specific installations may be provided upon request.
In no way are any such drawings to supersede the approved control drawings of the instrument and
any connected equipment. Obey all safety requirements of the control drawing before the
requirements of additional installation reference drawings.
Approved installation drawings
D A N G E R
Explosion hazard. Any installation or configuration that is not specifically shown on the control
drawings is not allowed. In all cases, the local authority with jurisdiction will make the final installation
decision.
Figure 2 is the approved control drawing. The certified drawing shows the ONLY approved method or
methods for installation for the instrument.
English 7