<6. Calibration>
6-2
IM 11R02A01-02E
5th Edition : Dec. 28, 2016-00
6.1.2
For Steel Mill Use
Refer to Figure 3.4 Flow Sheet (Steel Mill Use).
1) Close V-4 and open V-5. The burner is extinguished. However, if the pump being attached,
turn off the power supply of it in advance.
2) Set the secondary pressure of the pressure reducing valve for calibration gas cylinder to
approx. 200 kPa.
3) Open V-9 or V-10 and introduce the calibration gas.
4) Using the pressure reducing valve (4-1), adjust the indication of the flowmeter (4-2) to
become about 10 l/min. In case of only indication check, the adjustment to approximately 2
to 3 l/min is permissible.
5) Push the “START” switch of the calorie detector to ignite.
6) Set the computing station to Input/Output status display. The indication of “X3 (G-PRESS)”
is adjusted to ”500” with the pressure reducing valve (3-6). In the case of the density meter
being attached, confirm and readjust the flow rate.
7) Confirm “X2 (A-PRESS)” in Input/Output status display and adjust “X2” to “500” by using
V-16.
8) When the calibration is completed, close V-9, V-10, V-5 and open V-4. When the pump is
attached, turn on the power of the pump.
9) Push the “START” switch of the calorie detector to ignite.
10)
Readjust both the gas differential pressure and the flow rate to the density meter.
11) Do not forget to close the root valve of the calibration gas cylinder.
6.2
Span Adjustment of the Calorie Detector
This adjustment is not necessary for the usual calibration. This adjustment is held when
replacement such as the thermocouple of the burner unit takes place. This adjustment is
different depending upon if the preheating circuit exists or not. This adjustment is to be held after
regulating each differential pressure to “500”.
n
When no Preheating Circuit Exist
1) Set the computing station to Input/Output status display with X1 (NON-CORR. WI%).
2) Introduce the span gas and after ignition, wait until the indication “X1” becomes stable.
3) Adjust the indication, using the “SPAN” potentiometer on the front side of the calorie
detector, to become the specified value (x%). WI is used to find out the x value.
Example:
WI value of the span gas = 59.00 WI
WI value of the upper range = 60.00 WI
x =
100 = 98.3%
60.00
59.00
n
When Preheating Circuit Exists
1) Suspend the supply of the sample gas.
2) Same as the gas line pressure adjustment explained in paragraph 4.8), introduce
the air to
the gas line.
3) Set the “SAFE-EV” switch of the calorie detector to “RELEASE”, when the preheating
voltage is applied to the ignition heater of the burner unit, by which the increased
temperature with an effect of the preheating is detected by the thermocouple.
