Instruction Manual
Installation
LIQ_MAN_6081-P
February 2014
Installation
5
Section 2: Installation
2.1 Considerations
The transmitter can be commissioned before or after installation. It may be useful to commission
it on the bench, before installation, to ensure proper operation and to become familiar with
its functionality. When applicable, make sure the instruments are installed in accordance with
intrinsically safe or non-incendive field wiring practices. The device will be powered whenever the
power module is installed. To avoid depleting the power module, make sure it is removed when
the device is not in use.
Power module
The 6081 is battery powered. The power module with the wireless unit contains 2 “C” size
primary lithium/thionyl chloride batteries. Each power module contains approximately .5 grams
of lithium. Under normal conditions, the power module materials are self-contained and are not
reactive as long as the power module integrity is maintained. Care should be taken to prevent
thermal, electrical or mechanical damage. Contacts should be protected to prevent premature
discharge. Use caution when handling the power module. The power module may be damaged if
dropped from heights in excess of 20 feet.
Sensor
Make sensor connections through the cable entry in the enclosure. Be sure to provide adequate
clearance for cover removal.
Environmental
Verify that the operating atmosphere of the transmitter is consistent with the appropriate
hazardous locations certifications.
2.2 Unpacking and Inspection
Inspect the shipping container. If it is damaged, contact the shipper immediately for instructions.
Save the box. If there is no apparent damage, remove the transmitter. Be sure all items shown on
the packing list are present. If items are missing, immediately notify Rosemount Analytical.
Save the shipping container and packaging. They can be reused if it is later necessary to return
the transmitter to the factory.
2.3 Pre-Installation Set-up
2.3.1 Temperature Element
The 6081-P pH/ORP transmitter is compatible with sensors having Pt 100 and Pt 1000. Sensors
from other manufacturers may have a Pt 1000 RTD. For Rosemount Analytical sensors, the type
of temperature element in the sensor is printed on the tag attached to the sensor cable. For
the majority of sensors manufactured by Rosemount Analytical, the RTD IN lead is red and the
RTD RTN lead is white. The 328A sensor has no RTD. The 320HP system has a readily identifiable
separate temperature element. Resistance at room temperature for common RTDs is given in the
table.
If the resistance is...
the temperature element is a
about 110 ohms
Pt 100 RTD
about 1100 ohms
Pt 1000 RTD
2.3.2 Reference Electrode Impedance
The standard silver-silver chloride reference electrode used in most industrial and laboratory pH
electrodes is low impedance. EVERY pH and ORP sensor manufactured by Rosemount Analytical
has a low impedance reference. Certain specialized applications require a high impedance
reference electrode. The transmitter must be re-programmed to recognize the high impedance
reference.
