YOKOGAWA vigilantplant DM8, User Manual

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<4. OPERATION>
4-5
IM 12T03A01-02E
Enter the temperature of calibration solution 2 of which density at the reference temperature
is set at ‘7’.
Function No. ‘9’: Sets temperature coefficient of calibration solution 2
Enter the value which is -100000 times the temperature coefficient (g/cm 3 /°C) of the
calibration solution 2.
Function No. ‘A’: Starts calibration 2 (press SET key)
Pressing “SET” key executes 2nd calibration computation of two-point calibration.
(3) Maintenance mode (MAINT): Mode for adjusting and checking operating
conditions.
During this mode, analog and digital outputs are held (at the value just before holding).
F unction No. in maintenance mode is from ‘1.’ to ‘D.’ (see table 4.1).
Function No. ‘1.’: Cancellation of protection (enter 77)
Function to avoid data changing due to carelessness. When “0” is displayed, a function No.
is not entered. To release the protection, display “77” and press “SET” key. To reactivate the
protection, display "78" and then press the "SET" key. To avoid the possibility of hindering
normal measurement, when releasing or reactivating the protection, do not press the "SET"
key after displaying other numbers. In addition, the reactivation of protection does not take
effect until you perform another operation (e.g., change the function No. to '2') after you
release the protection.
Function No. ‘2.’: Displays frequency (density)
Checks operation of this converter. Frequency corresponding to measured density are
displayed. When the converter is normal, the frequency ranges from 600 to 700 Hz to 1000
or 1500 Hz.
(Note): Displayed frequency varies with measured density, liquid temperature and detector constant. If density is 0.5 to 2.0 g/cm 3 ,
temperature is 25 °C, detector constant (A) is 17074 and detector constant (B) is 36384, the frequency is 640 to 1400 Hz for
normal operation.
Function No. ‘3.’: Displays frequency (temperature)
Checks operation of this converter. A frequency signal converted from liquid temperature
voltage is displayed. If temperature is 25 °C, the frequency is about 25000 to 35000 Hz for
normal operation.
Function No. ‘4.’: Checks output signal
Checks zero point and span of an analog output signal.
(Note): The data at shipping is described in a data sheet in the converter.
Function No. ‘5.’: Checks LED (press SET key)
Function to check LED data display. When “SET” key is pressed, all displays flash five times
if it is normal.
Function No. ‘6.’: Sets low limit of the output range
Sets a low limit density value (g/cm 3 ) of an analog output range.
(Note): Set the value so that high limit - low limit is greater than equal to 0.05 g/cm 3 . You cannot enter a value that fails to meet this
condition.
Function No. ‘7.’: Sets high limit of the output range
Sets a high limit density value (g/cm 3 ) of an analog output range.
(Note): Set the value so that high limit - low limit is greater than equal to 0.05 g/cm 3 . You cannot enter a value that fails to meet this
condition.
Function No. ‘8.’: Sets reference temperature of measuring liquid
Sets a reference temperature (°C) of measuring solution.
Function No. ‘9.’: Sets temperature coefficient of measuring liquid
Sets the value which is -1 x 10 5 (= -100000) times the temperature coefficient of measuring
solution (g/cm
3
/°C) to change it to plus integer.
(Note): Purified water is an exception; its maximum density is at approx. 4 °C. Generally, temperature coefficients of any liquids are
minus number.
Function No. ‘A.’: Sets detector constant A
5th Edition : Dec. 11, 2015-00