SenSmart 3000 User's Manual
Document: UM-1003
Revision Level B
37
events. Once detected, the SenSmart 3000 transmits a constant mA output equal to the
Marker
value.
Entering
YES
in the
Marker Active
menu also activates
Marker TX LED
,
Mark Level
, and
Mark
As
menus.
Mark Level
allows entering the <3.75mA value (+.2mA) to detect.
Mark As
allows
entry of the up to 10 digit ASCII message the LCD readout will display when the
Marker
is
detected.
Marker TX LED
menu = YES, causes the front panel TXD LED (see Figure 2-1) to
also illuminate when the
Marker
is detected.
Important: Optional 10-0234 RS-485 modbus
port will not function if “Marker TX LED” menu must = YES.
T E C H N I C A L P A GE 2
R a w Mi n C n t s 5 11
R a w Ma x C n t s 10 0 0
Ma r k e r A c t i v e Y e s
Ma r k e r T X L E D N O
Ma r k L e v e l 1. 5 mA
Ma r k A s * * I N C A L *
Figure 7-4: 4-
20mA Input “MARKER” Menus
A
Marker
application example is as follows: Many gas detection monitors transmit
a “Cal Marker”
value of between 1 - 3mA during their calibration mode. Configuring SenSmart 3000 marker
menus as shown in Figure 7-4 will provide the LCD readout in Figure 7-5 when 1.5mA is the 4-
20mA input. In this example, the SenSmart 3000 4-20mA output will also transmit a 1.5mA
marker signal.
Me a s u r e me n t N a me
I N C A L
0
Figure 7-5: 4-
20mA Input Type “MARKER” Message
SECTION 8
– Millenium Sensor Calibration
The R.C. Systems Inc. MILLENIUM is factory calibrated zeroed and spanned.
Unlike catalytic
sensors it does not require routine span gas calibration to ensure proper operation.
The R.C. Systems Inc. MILLENIUM can be calibrated for almost any hydrocarbon using a
calibration gas of the hydrocarbon that is to be detected (
target
gas). The R.C. Systems Inc.
MILLENIUM is required to be spanned with gas only one time with the target gas. Typically this is
done at the factory, but it is possible to field span the device by connecting the R.C. Systems Inc.
MILLENIUM to a computer and using a software package provided by R.C. Systems Inc.. Please
contact the factory for further details.
A typical field calibration only requires the use of zero air (or 99.99% nitrogen).
If the sensor is
located in an area that is known to be free of the hydrocarbon gases then ambient air can be
used as a zero reference.
If zero air is used for the calibration, there is a fitting on the bottom of the sensor for a 1/8” ID
tubing connection.