RKI Instruments SDM-2012 PC Controlled Configuration - Manual (Page 22)

17 • Hardware Setup
GAS 1 and GAS 2 Tubing
NOTE: If you have only standard 4-gas GX-2012s, you do not need to
assemble a GAS 2 manifold. For every other instrument configuration,
a GAS 2 manifold does need to be assembled.
NOTE: If you are planning to bump test or calibrate GX-2012s and Gas
Tracers at the same time, create one manifold for the SDM-2012s that
will test the GX-2012s and a separate manifold for the SDM-2012s that
will test the Gas Tracers. See “Appendix A: Multiple Instrument
Configurations” on page 178 for instructions to bump test or calibrate
GX-2012s and Gas Tracers at once.
GX-2012 GAS 1, GAS 2 and Gas Tracer GAS 1 Tubing
Reference Figure 16 and Figure 17 for the instructions below.
1. Cut a 3-4” piece of 3/16 inch tubing for each GAS 1 and GAS 2 fitting on every
SDM-2012 except the last one.
2. Connect the tubing to the GAS 1 and GAS 2 fittings on every SDM-2012
except the last one.
3. Insert the smaller T-fittings into the tubing so that the remaining two ports on
the T-fitting are perpendicular to the GAS fitting.
4. Cut 6-7” pieces of 3/16 inch tubing and connect the T-fittings.
5. Cut two more 6-7” pieces of 3/16 inch tubing and connect the GAS 1 and GAS
2 fittings of the last SDM-2012 to the appropriate T-fittings from the second to
last SDM-2012.
6. Cut 2 pieces of 3/16 inch tubing long enough for easy access to the calibration
cylinders and connect them to the T-fittings on the first SDM-2012.
Gas Tracer GAS 2 Tubing
You must use a 6 inch humidifier during calibration of the ppm combustible gas
sensor. There are 3 options for calibration:
• use one calibration cylinder, one demand flow regulator, and one 6 inch
humidifier per SDM-2012
• have one calibration cylinder, one demand flow regulator, and one 6 inch
humidifier and calibrate all Gas Tracers one at a time using one SDM-2012
• use one calibration cylinder, one demand flow regulator, and a manifold of up to
ten 6 inch humidifiers
If you choose to manifold the humidifiers together, complete the following manifold
assembly instructions, and reference Figure 18.