RKI Instruments GD-70D Series User Manual

GD-70D - 48 -
● LN Specification
Specifications
LONWORKS (LN)
Signal
transmission
method
LONWORKS
Transmission
path
KPEV-S
Transmission
rate
78kbps
Transmission
distance
Max 2700m
* When bus topology (Double ended termination ) is used.
Connection load
resistance
―
Example of Gas Concentration and External Output
4 - 20 mA Specification
(Maintenance output: 2.5 mA setting)
CAUTION
<<4 - 20 mA Specification>>
• The 4 - 20 mA output is already adjusted. In case of over scale, an output will not exceed 22 mA.
• Output during inhibit or warmup is based on 4 - 20 mA output setting in Maintenance Mode.
The output may drop as low as 2.5 mA during warmup for oxygen units. Understand how the
detector functions, and take actions to prepare for false alarms.
<
Special Cases>
Maintenance output setting
Sensor unit
Details
2.5 mA
Use OSU (L-LL, L-H).
Output 2.5 mA during maintenance or inhibit.
Possibility of false alarm in the upper unit (L
alarm)
4 mA, HOLD, 4 - 20 mA
Specification change
(To OSU - 0 - 25 vol%)
When changing from a H-HH alarm pattern to
an L-LL or L-H alarm pattern, 4 mA (equivalent
of concentration zero) is used until the “C-02”
change message is confirmed.
Specification change
(From OSU - 0 - 25
vol%)
When changing from an L-LL or L-H alarm
pattern to a H-HH alarm pattern, 17.4 mA
(equivalent of approx. 84%FS) is used until the
“C-02” change message is confirmed.
2.5mA
4mA
20mA
22mA
Full scale
Gas concentration
External output
Zero
suppression
Detection mode
Maintenance mode

RKI Instruments GD-70D Series Specifications

General

Brand	RKI Instruments
Model	GD-70D Series
Category	Gas Detectors
Language	English