pH Meter

pH Meter - Model APX 175 E and APX 175 C

CD pH Meter incorporates the latest technological advancements. It has a very high stability, reproducibility and a continuous duty cycle.

This laboratory pH Meter incorporates an advanced C-MOS FET input operational amplifier and modular construction. It has a relative accuracy of ±0.01 pH unit or ±1 mV based on a low point calibration, repeatability of ±0.01 pH unit or ±1 mV and a stability (drift/24 hrs) of less than 0.01 pH.

It provides a digital LED (Model APX 175 E) and LCD (Model APX 175 C) display of pH 0.00 to pH 14.00 in 0.01 pH unit or milli Volts from 0 to ±1999 to nearest 1 mV.

Automatically indicated on the digital display are decimal point, pH/mV mode and mV polarity.

The following controls are provided on the front panel:

Push button controls :

Standby/Read position
pH / mV measurements
Manual / Automatic Temperature Compensation.
Dial Controls:

Temperature compensation control to read from -10°C to 130°C.
Slope control for correcting Electrode slope
Asymmetry control - adjustable span ± 1 pH by a 10 turn potentiometer, in steps of 0.01 pH.

The CD pH Meter is a light-weight instrument with aluminium sheet metal housing and is epoxy painted.

A unique feature is the two-dimentional electrode stand with a flexible spring balanced arm. A third socket is also provided for the optional auto temperature compensator.

Along with pH Meter we provide a combined electrode, electrode stand, electrode holder, buffers, wash bottle, dust protective cover and handy Instruction manual.

The ON / OFF Mains switch is mounted on the back panel with a status flag. Also mounted on the back panel are plug-in sockets for Electrodes, Automatic Temperature Compensator, Recorder Output

SPECIFICATIONS MODEL APX 175 E MODEL APX 175 C

Display Range 3½ Digit LED
7 Segment 0.5" Height
0.00 to 14 pH / 0 to ± 1999 mV 3½ Digit LCD
7 Segment 0.5" Height
0.00 to 14 pH / 0 to ± 1999 mV

Relative Accuracy ±0.01 pH / ±1.0 mV ±0.01 pH / ±1.0 mV

Repeatability ±0.01 pH / ±1.0 mV ±0.01 pH / ±1.0 mV

Stability (dirft/24 hrs) <0.01 pH after warm up period of 30 minutes non-cumulative <0.01 pH after warm up period of 30 minutes non-cumulative

Slope Adjustment

Asymmetry Potential Adjustable ±1 pH by a 10 turn potentiometer Adjustable ±1 pH by a 10 turn potentiometer

Temperature Compensation
Automatic(with Compensator probe APX 160) -10°C to 130°C -10°C to 130°C

Manual -10°C to 130°C -10°C to 130°C

Input Impedance >10 ¹⁴ Ohms >10 ¹⁴ Ohms

Polarizing current 10 µAmps 10 µAmps

Recorder output 0 to 100 mV full scale 0 to 100 mV full scale

Battery operation No Yes, 6 nos. 1.5V Cells Type Eveready 1050

Auto switch over from mains to battery during power failure No Yes

Mains Supply 230V AC 50Hz ±10% 230V AC 50Hz ±10%