Yokogawa In-Situ Gas Analyzer TDLS200 - Manual (Page 86)

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IM 11Y01B01-01E-A 6th Edition :Feb 13, 2013-00
<6. BASIC OPERATION>
9. Close the detector enclosure. Write down the final values of R21, R22 and R23 below for record.
R21 = ____________; R22 = ____________; R23 = ____________.
10. Keep the resistor bag and this procedure document by customer. DO NOT leave them in the detector box or
throw them away.
11. Enter these new resistor values into the analyzer configuration under Advanced Menu, Configure, System,
Adjustable Resistors Detect – R22, Detect R23 and Detect R-23. NOTE, all resistors values are entered in
kOhm units.
6.5.3 Detector Gain Adjustment Service Tips
• How to remove a gain resistor? On the detector board, find the location of the gain resistor. Please note that
the resistor is not soldered but resting in sockets. Carefully remove the resistor from the socket on the board.
Since the analyzer is still powered on, please take extreme caution to prevent a short circuit on the board, i.e.
loose wires or touching adjacent components with pliers or tool used to remove resistor.
• How to install a new gain resistor? First try the new resistor by molding and clipping the resistor leads to fit
into the socket. Then carefully insert the resistor into the socket on the detector board. Since the analyzer is
still powered on, please take extreme caution to prevent a short circuit on the board, i.e. loose wires or
touching adjacent components with pliers or tool used to install resistor.
• Please keep the factory/original gain resistors in the resistor bag as they will be used in the future for offline
calibration or test.
• The raw detector signal (MAX-MIN) is proportional to R21·R22·R23. Usually R21 is maintained as factory value.
R22 and R23 are optimized in the field. We want to avoid the situation where one of R22 and R23 resistors has
extreme low resistance and the other one has extreme high resistance. The analyzer gives best performance
when R22 and R23 are balanced. Based on this relation between raw detector signal and gain resistors,
service technician or customer can select R22 and R23 faster with the help of a calculator.
• Multiple alignment actions might be needed if Detector Signal High fault happens. Reduce the gain resistor
first as described in STEP 8-a, and then optimize the alignment again.
6.6 Valve Control Logic
The TDLS200 has three valve driver outputs (24VDC, 11W max each) available at Launch unit
connection terminal TB-3. those can be used for calibration/validation functions and/or stream switching
functions if being used in an extractive installation. The valve control logic is outlined below:
Manual Switch
• Turn the valve on.
o If time sequence is on, record valve_start[0] (current minute).
o No need to turn off other valves. Multiple valves can be on at the same time.
• Turn the valve off.