RKI Instruments Beacon 110 - Manual (Page 37)

Beacon 110 Operator’s Manual 33
Chapter 7: Maintenance
Overview
This chapter describes how to calibrate the Beacon 110 using Calibration Mode, replace
the AC fuses, and preventive maintenance procedures for the Beacon 110. It includes a
troubleshooting guide for problems you may encounter with the Beacon 110.
Calibration Frequency
Although there is no particular calibration frequency that is correct for all applications, a
calibration frequency of every 3 to 6 months is adequate for most Beacon 110
applications. Unless experience in a particular application dictates otherwise, RKI
Instruments, Inc. recommends a calibration frequency of every 3 months.
If an application is not very demanding, for example detection in a clean, temperature
controlled environment where a combustible or toxic gas is not normally present, and
calibration adjustments are minimal at calibration, then a calibration frequency of every 6
months may be adequate.
If an application is very demanding, for example if a combustible or toxic gas is present
often and in significant concentrations or the environment is not well controlled, then more
frequent calibration than every 3 months may be necessary. For combustible gas
detection, if potential catalyst poisons are known or likely to be present, more frequent
calibration than every 3 months will be necessary.
Calibration Mode
Calibration Mode is used to calibrate the Beacon 110’s detector head. The Beacon 110
can support both direct connect (internal amp) and 4-20 mA transmitter (remote amp)
detector heads. Each type has special considerations when calibrating:
• Direct connect detector head.
If a direct connect detector head is installed, then all calibration adjustments are made
at the Beacon 110 after calibration gas is applied to the detector.
• 4-20 mA transmitter detector head.
If a 4-20 mA transmitter detector head is installed, then all calibration adjustments are
made at the detector head while calibration gas is being applied to the detector.
Calibration Gas Response Memory Feature
When a direct connect detector head is installed, the Beacon 110 has the capability to
“remember” the detector’s response to the calibration gas after the gas is removed from
the detector during the fresh air or span (zero for an oxygen detector) adjustment
procedure. This feature enables one person to perform calibration if the detector is
mounted remotely from the Beacon 110. When zero air is applied to the Beacon 110
during a fresh air adjustment, the Beacon 110 will freeze the display reading at the lowest
(highest for an oxygen detector) response and the Beacon 110 will continue to display this
reading and retain it in its memory until the fresh air adjustment procedure is completed.