WT.050.130.000.UA.IM.1108
ACUTEC
™
35 SYSTEM
36
4.4
Gas Generator Replacement (See Dwg. 50.130.150.001)
To replace, disconnect the Generator leads from the terminal block marked
TB2. Loosen the cable gland, pull the wires out of the enclosure, and
unscrew the Generator from the sensor. Reverse the process to install
the new Generator. Observe the wiring polarity when installing the new
Generator.
Once installed, the new Generator should be tested by running the Manual
Auto-Test procedure described in paragraph 3.3.6. If no sensor response
is observed, recheck the Generator connection to be sure the polarity is
correct and that switch D1 in the Receiver Module is in the “on” position.
If the sensor still does not respond, test the sensor with the appropriate
Sensor Response Test described in paragraph 4.2. If the sensor does not
respond, replace it. If the sensor responds properly, contact Siemens
Water Technologies for assistance with the Generator.
4.5
Sensor Calibration (See Dwg. 50.130.150.001)
The zero may drift with temperature, and it is recommended that the
sensor zero be adjusted upon initial installation and every month after.
At minimum, seasonal adjustments should be made to avoid false alarms
due to zero drift.
For applications where precise indication of gas level is required, Sen-
sor/Transmitters should be spanned every three to six months. The best
calibration sources are generally 10% accurate, and a Sensor/Transmitter
will normally change sensitivity by less than 25% over 12-months time. If
on-site calibration is not practical, it is recommended that a new, factory
calibrated Sensor/Transmitter be purchased every two years.
NOTE: It is essential that the transmitter zero and span adjustments
be re-calibrated whenever sensors or transmitter circuit boards are
replaced independently.
Calibration of the Sensor/Transmitter requires a digital volt meter (DVM),
a source of calibration gas and a calibration adapter for the sensor.
For CHLORINE, electrochemical generators are typically used for calibra-
tion gas. SULFUR DIOXIDE gas can be obtained in disposable cylinders
from specialty gas suppliers. AMMONIA calibration gas can be obtained
in refillable high pressure cylinders from specialty gas suppliers. For more
information on calibration gas equipment, contact your Siemens Water
Technologies equipment distributor.
Proper tubing should be used to connect gas sources to sensors, particu-
larly chlorine. Polyethylene tubing is recommended for all gases.
