RKI Instruments 65-2461RK - Manual (Page 11)

65-2461RK PPM Hexane Transmitter • 7
Start Up
This section describes procedures to start up the ppm hexane transmitter and place the
transmitter into normal operation.
Introducing Incoming Power
1. Complete the installation procedures described earlier in this manual.
2. Verify that the power wiring to the controller is correct and secure. Refer to the
controller operator’s manual.
NOTE: When a transmitter is first powered up after installation or being off power for an
extended period, its signal will increase rapidly over a few seconds to a high
level and then the signal will decrease so that it appears stable after a few
minutes. Be sure to make arrangements so that this does not cause unwanted
alarms.
3. Turn on power to the controller.
4. Turn on the controller.
5. Verify that the controller is on and operating properly. Refer to the controller
operator’s manual.
Transmitter Burn-In Period
Once power has been applied to the transmitter, it will take several days for the
transmitter signal to the controller to stabilize completely. This is the burn-in period. The
zero reading may be slightly above zero after startup and will stabilize in about 5 to 7
days. The transmitter is calibrated at the factory before shipment and it is not necessary to
calibrate the transmitter after startup. If calibration of the transmitter after startup is
desired, wait at least 5 days after startup before calibrating the transmitter. A burn-in
period of 7 days is recommended. See “Calibration” on page 15 for calibration
instructions.
After the burn-in period, set the zero reading if necessary as described in “Calibration” on
page 15.
CAUTION: Do not adjust the zero or span potentiometers for at least 5 days after startup. If the
fresh air reading is high enough to cause unwanted alarms during the burn-in
period, adjust the zero pot only enough to bring the reading below the alarm point.
Setting the Zero Signal
CAUTION: If you suspect the presence of combustible gas in the monitoring environment, use
the calibration kit and the zero air calibration cylinder to introduce “fresh air” to the
detector and verify an accurate zero setting. See “Calibration” on page 15 for
instructions to apply zero air when setting the zero signal.
1. Verify that the transmitter is in a fresh air environment (environment known to be free
of combustible gas).
2. Unscrew and remove the junction box cover from the junction box.
3. Set a voltmeter to measure in the millivolt (mV) range.