Yokogawa Pneumatic Retractables RF20H - Manual (Page 4)

IM 12B06K05-E-E
4
1.1 General safety instructions
The RF20H (Extract 810 and 820) retractable
holder is designed in a way that when the operation
manual is observed the product does not cause any
hazards.
• Read the operation manual before use.
• Do only install and operate the retractable holder
before having read and understood all notes on
the safe and proper use.
• Keep the operation manual for future reference.
• Operate the retractable holder only in trouble-free
condition.
• In addition, observe laws, regulations, guidelines
and standards applicable in the operator’s country
and at the site of use.
1.2 Proper use
The RF20H (Extract 810 and 820) retractable holder
is attached to tanks or piping. A sensor is inserted
in the process liquid by the drive unit in order to
measure chemical or physical properties. The
procedure is controlled automatically and can not
be operated manually.
The choice of material properties of holder and
equipment depends on the process properties.
The retractable holder should be serviced on a
regular basis.
• Establish a service plan adapted to your process.
• Only perform the service, maintenance described
in the operation manual!
• Modifications to the holder must be agreed with
the manufacturer.
The manufacturer is not liable for any damages
resulting from improper or inappropriate use.
1.3 Hazard areas and residual hazards
Retractable holders are connected to tanks and
piping that may be under pressure. Leaking of
process liquid only occurs in case of negligence and
improper operation.
• Prior to commissioning and after every servicing,
ensure that all seals and connections are
complete and in working order.
• Never remove the lower and top housing cramp
screws during operation of the holder.
• Take applicable protection measures prior to
touching the holder as parts of the retractable
holder may adopt the process temperature.
1.4 Equipment
Only use certified and approved accessories and
equipment.
Seals Choose material properties
of process seals and O rings
according to process medium and
cleaning liquid(s).
Observe swelling ability and acid
and alkaline resistance of seal
material.
Sensor Choose a suitable sensor and
observe information in chapter 8
“technical specifications”.
Pressure air Filter (40 µm), clean and deoil
compressed air.
Ensure that the pressure is between
4 and 6 bar.
Cleaning Choose cleaning liquid and
liquid/ detergent according to process,
detergent holder, and seal material and
dispose it an appropriate way.
1. Safety and protection measures
CAUTION!
DANGER!
WARNING!