RKI Instruments GD-70D Series - Manual (Page 42)

4 Detection Mode 4-4. Other functions
GD-70D - 42 -
<Calibration History/Alarm Trend History/Event History
Functions>
The detector and the sensor unit have their own history functions. To use these functions, contact our sales
department.
<Sensor Unit Automatic Recognition Function>
The detector has the function to automatically recognize the sensor unit when the sensor unit is replaced or
the specification is changed.
When a sensor unit with a different serial number or with a different principle or specification is attached,
one of the following messages is displayed for helping the correct installation.
C-01
CHG UNIT
MAINTENANCE
Unit Replacement
Displayed when a unit with the same specification (principle, type, range, and so
on) is attached (e.g. in a regular replacement).
Press the MODE key to recognize the new sensor unit and start the monitor.
↓
C-02
CHG SPEC
MAINTENANCE
Specification Change
Displayed when a unit with a different specification (principle, type, range, and so
on) from the previous one is attached.
Press the MODE key to recognize the unit with the new specification and start the
monitor.
If you do not intend the specification change, this message might mean the
installation error. Check the correct installation.
CAUTION
If you confirm the specification change (principle, sensor type, detected gases, detectable range, and so
on) of the sensor unit for "C-02", the specification of the gas detector head is changed. Note that it resets
the alarm setpoint (ALM P) as well as the following parameters to the standard setting values.
If you want to use nonstandard setting values, set them in the maintenance mode.
• Alarm delay time setting (ALM DLY)
• Suppression value (SUPPRESS)
• Alarm type (ALM TYP) ...... The OSU specification includes "L-LL", "L-H", and "H-HH".
<Standard Setting Values by Principle>
ESU SSU SGU OSU
(0 - 25 vol%) OSU
(0 - 5 vol%) OSU
(0 - 50 vol%)
Alarm delay 2 seconds 2 seconds 2 seconds 2 seconds 2 seconds 2 seconds
Suppression
value 6 %FS 2 ppm
(TEOS) 10 %FS 0.5 vol%
(AIR supp) 0 vol% 0 vol%
Alarm type H-HH H-HH H-HH L-LL H-HH H-HH
"Change from OSU (L-LL alarm)" or "change to OSU (L-LL alarm)" reverses the direction of the alarm. It
requires special care because the previous settings are kept for the external output and other settings in
the maintenance mode. Immediately after "C-02" is confirmed with the MODE key, the initial clear is
started and the new actions are enabled. (The initial clear output is shifted together.)
CAUTION
The sensitivity correction is just an auxiliary function. It uniformly lifts the span up based on the principled
degradation pattern only and cannot consider the sensitivity variation of an individual sensor.
To correct the sensitivity variation of an individual sensor, you must make the regular span adjustment
using an adjustment gas.