SenSmart 3000 User's Manual
Document: UM-1003
Revision Level B
33
Analyzer range of 500
– 1000 BTU’s. In this case, 0% of full scale equals 500 BTU’s and may be
the desired zero calibration point. Other upscale values may also be used for the zero calibration
point by setting this menu item to the desired engineering unit value. Do not exceed 25% of full
scale.
6.7
Raw Min / Max Counts (Technicians only!):
The
Raw Min / Max Counts
menus determine the range of 10-bit analog to digital (A/D)
converter counts that define 0 & 100% of full scale. Raw Min A/D counts create 0% readings and
Raw Max A/D counts create 100% readings. These menus are very useful in application with
non-standard input ranges. For example, if instead of a standard 4-20mA input 8-18mA must be
accepted by the SenSmart 3000. Set RAW MIN COUNTS to match the 8mA input counts value
and RAW MAX COUNTS to match the 18mA input counts value. The corresponding
Zero 0%
and
Span 100%
readings are entered in the Configuration Menu describe in section 5.3. Live
A/D count values may be viewed from the CAL MODE Information screen described section 4.1.
6.8
4-20mA Input Marker / Message (Technicians only!):
See section 7.3.1 for description of the 4-20mA Input Marker / Message menus. This
feature is only available with SenSmart 3000 models.
SECTION 7
– SPECIAL ORDER CONFIGURATIONS
7.1
ARCTIC Option
SenSmart 3000 models may be ordered with a special
ARCTIC
configuration to include a 175
ohm 4-watt heater / temperature controller circuit mounted to the back of the 10-0233 Power
Supply PCB (Figure 2-5). In addition, when equipped with a locally mounted 10-0247 Smart
Sensor Head (Figure 2-9) ARCTIC Smart sensors are available with a 1-watt heater /
temperature controller for warming the sensor compartment. This is important since many
electrochemical sensors have a low temperature rating of only -20C. If incoming 10-30VDC
power is at least 24VDC, the ARCTIC option extends SenSmart 3000 operation down to -55C.
Important! ARCTIC SenSmart 3000
’s consume more power when it is cold!
When
temperature inside the SenSmart 3000 enclosure is below -25C the 175 ohm 10-0233 PCB
heater is connected across the incoming DC power terminals. When an ARCTIC Smart Sensor is
installed, its 1-watt heater is connected across the SenSmart 3000
’s internal 5VDC power supply
when Sensor Temp is below the Setpoint (see section 7.1.1). These additional loads must be
considered when sizing t
he installation’s DC power supply.
7.1.1 ARCTIC Smart Sensor Temperature Setpoint Option
Both the O2/TOXIC and LEL/Current channels (see section 3.1.1) are capable of accepting
ARCTIC Smart Sensors with 1-watt heater / temperature controller circuits. ARCTIC sensor
temperature controllers have a unique address that is automatically detected by the SenSmart
3000. This activates the
Sensor Temp
menu on page 2 of the channel’s main menu as shown
below in Figure 7-1. Selecting
Sensor Temp
and pressing EDIT opens a window displaying the
sensor’s current temperature and the 1-watt heater’s
Setpoint
. When the
Sensor Temp
value is
below the
Setpoint
value the heater is on. This feature is helpful in applications where the
sensor temperature must be higher than the ambient temperature to function properly.
