Delta OHM DO 9403T-R1, Quick Start Manual

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Manual temperature setting
If the temperature probe is not connected or if the probe is broken the
measuring unit °C or °F flashes. In this case it is possible to set the temperature
compensation value manually.
- Press the CAL key and the °C/°F key together; the
Δ
symbol appears and the
manual temperature is shown with the measuring unit flashing.
- Using the
▲
and
▼
keys, set the temperature value corresponding to the
temperature of the liquid in which you wish to measure the pH.
- Press CAL to confirm this value. The
Δ
symbol switches off and the instrument
returns to the previous display.
Calibration of the pH electrode
Calibration of the offset of the pH electrode:
- Immerse the electrode in the buffer solution used for calibrating the offset (6.86
pH).
- Press the CAL key and the pH/mV key together; the
Δ
symbol lights up on the
display.
- Using the
▲
and
▼
keys, adjust the pH value measured as a function of the
liquid temperature.
- Press CAL to confirm this value. The
Δ
symbol switches off.
Calibration of the slope of the pH electrode:
- Immerse the electrode in the buffer solution used for calibrating the slope (4.01
or 9.18 pH).
- Press the CAL key and the pH/mV key together; the
Δ
symbol lights up on the
display.
- Using the
▲
and
▼
keys, adjust the pH value measured as a function of the
liquid temperature.
- Press CAL to confirm this value. The
Δ
symbol switches off.
NOTE: If you want to quit without storing the new calibration, press the °C/°F
key.
N.B.: The instrument can automatically recognize three standard calibration
solutions: 4.01 pH, 6.86 pH and 9.18 pH.
Programming the parameters
P1 Relay control unit and analog output, pH or mV.
P2 pH/mV value corresponding to 4 mA at output. May be set between -1.00
pH and 15.00 pH or between -1999 mV and +1999 mV.
P3 pH/mV value corresponding to 20 mA at output. May be set between -1.00
pH and 15.00 pH or between -1999 mV and +1999 mV.
P4 Delay time in the intervention of relay A. May be set between 0 and 250
seconds.
P5 Delay time in the intervention of relay B. May be set between 0 and 250
seconds.
P6
Calibration of Pt100 probe.
P7
4 mA output current calibration.
P8
20 mA output current calibration.
P9
Input voltage calibration.
P10 Display of the offset voltage value and of the slope value of the electrode.
To change one of these parameters press key PRG until the message
corresponding to the parameter to be changed appears on the screen.
Press OK to show the value of the parameter.
Using the
▲
and
▼
keys, bring the parameter displayed to the desired value.
Press OK again to confirm.
Parameter P10 cannot be altered, it can only be displayed.
NOTE
P6-P7-P8-P9: calibration procedure to be carried out at a laboratory
by skilled workers.
Pt100 probe calibration (100
Ω
at 0°C)
- Connect the Pt100 probe to the instrument. Press the PRG key until the
message P6 appears on the display.
- Press the OK key; the currently measured temperature appears on the
display.
- Immerse the Pt100 probe and a precision thermometer for reference in the
zero calibration bath. Wait long enough for the reading to become stable.
- Using the
▲
and
▼
keys, adjust the value of the temperature measured
by the Pt100 probe so that it corresponds with the value on the reference
thermometer.
- Immerse the Pt100 probe and a precision thermometer in the full scale
calibration bath. Wait long enough for the reading to become stable.
- Using the
▲
and
▼
keys, adjust the value of the temperature measured
by the Pt100 probe so that it corresponds with the value on the reference
thermometer.
- Press OK to confirm. To quit programming, press PRG repeatedly.
N.B.: If the temperature shown by the instrument is between ±12°C, the instrument
calibrates the probe offset, otherwise it calibrates the gain.
Calibrating the analog output
- Connect a precision milliammeter to the analog output.
- Press the PRG key until the message P7 appears on the display.
- Press OK; the message 4.0 appears on the display, indicating calibration at 4
mA.
- Using the s and t keys, adjust the value of the output current so as to have an
indication of 4,00 mA on the precision milliammeter.
- Press the PRG key until the message P8 appears on the display.
- Press OK; the message 20.0 appears on the display, indicating calibration at
20 mA.
- Using the s and t keys, adjust the value of the output current so as to have an
indication of 20,00 mA on the precision milliammeter.
- Press OK to confirm. To quit programming, press PRG repeatedly.
Combined electrode
input
pH -1.00 pH...15.00 pH (-500...+500 mV)
ORP -1999...+1999 mV
Input impedance >10 Tohm
Cable length <50 metres screened (about 5 nF)
Accuracy
0.1% of reading ±1 digit ±0.01% of pH per °C of
temperature drift
Temper
ature
input
Pt100 2/4 wires -50...199.9°C
Transducer energizing 0.5 mA DC
Cable length
<10 metres unscreened
<20 metres screened (about 2 nF)
Accuracy 0.2°C ±0.1% of reading ±2 digits ±0.01°C/°C
pH electrode temp
.
compensation
Automatic According to Nerst
Current output
4.00...20.00 mA
Programmable and proportional to the pH or mV
value
Accuracy 0.5% of reading ±0.02 mA
Insulation 2500 Vac 1 minute
Rela
y
output
A and B Bistable, contact 3 A/230 Vac free potential
Po
w
er
supply
Active 24 or 230 Vac -15/+10% 1 VA, 48...62 Hz, see fig. 1
Passive 4÷20 mA, 2 wire configuration, 10÷35 V, see fig. 2
Temp
.
Operation 0...50°C
Storage -20...70°C, no condensation
Case
External dimensions 120x80x56 mm
Protection class IP64
Dimensions
PH-4 PH-5