SPEC Sensors
DSDK Tool
3
www.spec-sensors.com
Quick Start Guide, Rev. 0.1
(510) 574-8300
To stop logging, press the
Start/Stop
Logging button again.
To read the contents of the EEPROM memory,
o
If necessary, stop logging.
o
Press the
Read EEPROM
button.
o
A single ppb gas measurement will display at the bottom of the window, followed by a read-out of
the EEPROM memory variables.
3.5. Advanced Settings
The sensor calibration may be modified by changing
both the zero value and the span value. For best
results, re-calibration should be done near room
temperature (20 °C, 50% RH).
o
To change the zero, ensure there is no target
gas present. Press the
Re-Zero
button. The
module will take up to a minute to calculate a
new zero.
o
To change the span, place the module in an
enclosed environment and safely expose it to
a known concentration of the target gas. Allow
the environment and module to stabilize at the
concentration. Type the known concentration
(in PPM) into the field next to the
Re-Span
button, then press the button. The module will take up to
two minutes to calculate a new span factor.
o
To reset the calibration, remove the sensor from the module and follow the instructions to
C
onfigure the D-ULPSM for a Different Gas Sensor
.
An offset may be added to the temperature sensor. Type the desired offset into the field to the right of the
button and then press
Set Temperature Offset
.
WARNING: Using the
Set 3 LMP bytes
button should be done with CAUTION. Changing these settings may
severely alter the operation of the sensor. Furthermore, it may temporarily or permanently damage the
sensor.
When the D-ULPSM module is reconfigured based on the sensor barcode, the potentiostat control circuit
settings are set to defaults that were determined to be optimal by SPEC Sensors. To change the settings
manually, first refer to the Texas Instruments LMP91000 data sheet for more information on the operation of
the chip and the available settings options.
In the SPEC Sensors DSDK Tool, there are 3 fields to the right of the
Set 3 LMP bytes
button. From left to
right, they correspond to: TIACN (TIA Control Register), REFCN (Reference Control Register), and
MODECN (Mode Control Register). Determine the desired binary word settings for each register, convert to
decimal, enter those decimal values into the 3 corresponding fields, and then press the button.
