Teledyne TIENet 301, Инструкция по установке и эксплуатации, Страница: 11 / 30

TIENet
®
301 pH/Temperature Device
Section 1 Introduction
1-3
The ISCO pH probe combines both electrodes in a single housing
and also contains an amplifier to reduce the extremely high
impedance of the circuit. This improves the reaction of the probe
to stray capacitance and reduces interference caused by electrical
noise in the vicinity.
Like any other chemical reaction, pH measurement is affected
significantly by temperature. Consequently, temperature com-
pensation is provided in the 301. The pH probe has a built-in
temperature sensor that is exposed for faster response.
When the ion-selective electrode and the reference electrode are
connected to a high-impedance voltmeter and submerged in
solution, ions move to the surface of the membrane. The elec-
trical charge on the ions creates a potential difference across the
barrier between the solution and the membrane. This potential,
or voltage difference, is proportional to the activity of the ions in
solution.
The potential, when read by a sensitive voltmeter, translates into
a reading of pH. With the Signature flow meter, the voltage is
sent first to a preamplifier inside the probe to reduce the
impedance of the circuit and improve the signal-to-noise ratio,
and then on to the 301 to allow greater operating distance from
the flow meter.
Note that pH probes are a consumable item, and not covered
under the standard one year warranty.
CAUTION
Never allow the pH glass bulb to dry out. When storing the
probe, always protect the bulb by covering the end with the
plastic cap with a moistened sponge or cloth inside.
1.3 Technical
Specifications
Table 1-1 Technical Specifications
a
TIENet 301 Device
301 Weight (w/o sensor) w/ 10m cable: 3.5 lb
Ambient Operating Temperature
-20 to 50 °C (-4 to 122 °F)
pH Measurement Range 0 to 14 pH units
Temperature Compensation Performed by the 301 device
pH Accuracy
±0.1 pH units (new probe, freshly calibrated within range)
pH Probe
Dimensions 1.12"

; 6" long,
3
/
4
NPT; Cable 25ft
Body Material 316SST
pH Electrode Junction Double porous
Temperature Measurement Range
0 to 80°C (32 to 176°F)
a. All specifications are subject to change without notice.