General specifications – Yokogawa SC25F User Manual

Page 8

IM 12B6J1-41E-E

2. GENERAL SPECIFICATIONS

2.1 Measuring elements : pH glass electrode

: Silver Chloride reference

: Solid Titanium electrode

: Pt1000 temperature sensor

2.2 Wetted parts
Sensor body

: Glass, PPS

Measuring sensor

: G-glass or L-glass

Reference junction

: Porous PTFE

Earth pin

: Solid Titanium

O-ring

: FKM (Viton)

2.3 Functional specifications (at 25°C)
Measuring system
Isothermal point

: pH 7

Reference system

: Ag/AgCl with saturated KCl

Glass impedance - G-glass : 400 M

Ω nominal

- L-glass : 775 M

Ω nominal

Liquid outlet

: Non-flow junction

Junction resistance

: < 10 k

Temperature element

: Pt1000 to IEC 751

Asymmetry potential(zero) : 8 ± 15 mV
Slope

: > 96 % (of theoretical value)

Note: The SC25F temperature sensor is designed for cell compensation and for indication.

It is

NOT designed for process temperature control.

2.4 Dynamic specifications
Startup time sensor

: < 60 sec.

Response time pH

: t

< 15 sec. (for 7 to 4 pH step at 25 ºC)

Response time temperature : t

< 1.5 min. (for 10 °C step)

Stabilization time pH

: < 2 min. (for 0.02 pH unit during 10 sec.)

2.5 Operating range
pH*

: 0 to 14

Temperature** - G-glass

: -10 °C to 80 °C (14 °F to 176 °F)

- L-glass

: +15 °C to 125 °C (59 °F to 257 °F)

Pressure (static) ***

Conductivity

: > 10 µS/cm

Note* : The pH operating range is 0-14 pH, but using the sensor at temperature- and / or

pH-extremes will seriously shorten the lifetime.

Note** : The operating temperature for sensor in combination with PR10 retractable fitting

is limited to 80 ºC

Note*** : Process pressure fluctuations will shorten the lifetime of the sensor

p(bar)

Temp. (ºC)

-10

130

100