11. Measuring with the measuring menus
1. Setting up a means of calibration for the zero point:
Function
Select setpoint 1
Setpoint 1:
07.00
pH
Zero-point adjustment
by pressing
<ADJ>
Adjustment value is retained
00:
07.00
pH º
In the case of pH probes you can by pressing
<CLEAR>
restore the
default values, base value 7.00 and gain -0.1689.
2. Setting up a means of calibration for the slope:
Function
Select setpoint 2
Setpoint 2
10.00
pH
Gain adjustment
by pressing
<ADJ>
Adjustment value is retained
00:
10.00
pH º
Gain shows approx.
Gain : -0.1689
The
gain error
shows the deviation from the
rated value and thus the status of the probe.
Gain error
9 %
If sensors are locked they can be temporarily unlocked by pressing
<FREE>
.
11.2.4 Two-point adjustment with setpoint entry
In menu
U1 Measured value correction
two-point adjustment can also be per-
formed for other sensors. In addition to zero-point adjustment11.2.2gain is also
corrected in the
Setpoint
function by means of a second measuring point. The
correction factor is calculated automatically at the touch of a button and stored
as factor on the sensor connector.
1. Zero-point adjustment
Put sensor in its
zero status
(icy water, unpressurized, etc.)
To set measured value to zero (see 11.2.2) press
<ZERO>
/
<ADJ>
,
PROG
2. Final value correction
Adjust sensor in a defined
setpoint
00: 098.7 °C
(boiling water, known weight, etc.)
With
ALMEMO force
transducers
activate calibration resistance (see Man. 3.6.2)
<ON>
or
<OFF>
Enter setpoint
in function ´Setpoint´
Setpoint
: 100.0 °C
Adjust measured value in function ´Setpoint´ :
<ADJ>
The measured value shown should then be the setpoint.
00: 100.0 °C
If the sensor is locked at level 4 the correction factor is programmed
as ´Factor´; if the sensor is locked at level <= 3 or temporarily un-
locked by pressing
<FREE>
, the correction factor is programmed as
gain correction (see 12.3.7).
34 ALMEMO
®
5690-2M