Delta OHM HD3406.2, User Manual, Page: 8 / 44

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tion year is not displayed. The cell constant change, using the K CELL parameter, resets the
date.
8) ALPH_T (Temperature coefficient
α
T
): the temperature coefficient
α
T
is the percentage
measurement of the conductivity variation according to temperature and is expressed in
%/°C (or %/°F). The admitted values vary from 0.00 to 4.00%/°C. Use the arrows (
and
) to set the desired coefficient
α
T
, and confirm with ENTER.
9) REF_TEMP (reference temperature) : it indicates the temperature to which the displayed
conductivity value is standardized and can be equal to 20°C or 25°C. Using the arrows (
and ), set the desired value and confirm with ENTER.
10) TDS (Conversion factor
χ /TDS)
: it represents the ratio between the measured conductivity
value and the total quantity of dissolved solids in the solution, expressed in mg/l (ppm) or g/l
(ppt). This conversion factor depends on the nature of the salts present in the solution: in the
field of water quality treatment and control, where the main component is CaCO
3
(Calcium
Carbonate), a value of 0.5 is usually used. For agriculture water, for fertilizers preparation,
and in hydroponics, a factor of about 0.7 is used. Using the arrows (
and ), set the de-
sired value, selecting it in the 0.4…0.8 range, and confirm with ENTER.
11) RCD MODE (Record mode) : the instrument captures a conductivity and a temperature
value every second. If the RCD MODE parameter is set to " conductivity " (factory default),
the maximum (MAX) and minimum (MIN) values displayed using FUNC refer to conduc-
tivity: the indicated temperature is that measured at the maximum and minimum conductiv-
ity and is not the maximum and minimum temperature.
If the RCD MODE parameter is set to "
tp " (=temperature), the maximum and minimum
values displayed using FUNC refer to temperature: the indicated conductivity is that meas-
ured at the maximum and minimum temperature and is not the maximum and minimum
conductivity.
Finally, if the RCD MODE parameter is set to "
Indep " (=independent), the maximum and
minimum values displayed using FUNC are independent: the indicated conductivity and
temperature are the maximum and minimum measured values but are not necessarily re-
ferred to the same measurement moment.
12) Probe type ( the message "PRBE_TYPE" is scrolled in the comment line. The main line in
the center of the display shows the type of temperature probe connected to the instrument.
Conductivity/temperature combined probes with Pt100 or Pt1000 sensor, or temperature
only probes can be connected to the input:
•
4 wire PT100 using the TP47 module
•
2 wire PT1000 using the TP47 module
Upon being turned on, the instrument automatically detects the temperature probes: the
Probe Type menu item is configured by the instrument and cannot be modified by the user.
If no temperature probe or combined probe with temperature sensor is connected, the in-
strument displays a dotted line (- - - -).
13) YEAR : to set the current year. Use the arrows to modify this parameter and confirm using
ENTER.
14) MNTH (month) : to set the current month. Use the arrows to modify this parameter and con-
firm using ENTER.
15) DAY : to set the current day. Use the arrows to modify this parameter and confirm using
ENTER.