Myron-l TH1 User Manual download pdf (Page 29)

D. Soft Protective Carry Cases

Padded Nylon carrying case features a belt clip for hands-free mobility.

Two colors to choose from;

Blue - Model #: UCC

Desert Tan - Model #: UCCDT

E. Hard Protective Carry Cases

Large case with 2 oz. bottles of calibration Standard Solutions (KCl-7000,

442-3000, 4, 7, & 10 pH buffers and pH storage solution) -

Model #: PKUU

Small case (no calibration Standard Solutions) -

Model #: UPP

F. Replacement pH Sensor (TPH1 & TH1)

pH sensor is gel lled and features a unique porous liquid junction. It is

user-replaceable and comes with easy to follow instructions.

Model #: RPG

XVII. TEMPERATURE COMPENSATION (Tempco)

of Aqueous Solutions (TPH1 & TP1)

Electrical conductivity indicates solution concentration and ionization

of the dissolved material. Since temperature greatly affects ionization,

conductivity measurements are temperature dependent and are normally

corrected to read what they would be at 25°C.

A. Standardized to 25°C

Conductivity is measured with great accuracy in the TechPro II using a

method that ignores ll level, electrolysis, electrode characteristics, etc.,

and features a unique circuit to perform temperature compensation. In

simpler instruments, conductivity values are usually assigned an average

correction similar to that of KCl solutions for correction to 25°C. The

correction to an equivalent KCl solution is a standard set by chemists

that standardizes the measurements and allows calibration with precise

KCl solutions. In the TechPro II, this correction can be set to either KCl,

NaCl or 442 to best match your applications.

B. Tempco Variation

Most conductivity instruments use an approximation of the

temperature characteristics of solutions, perhaps even assuming

a constant value. The value for KCl is often quoted simply as

2%/°C. In fact, KCl tempco varies with concentration and temperature

in a non-linear fashion. Other solutions have more variation still. The

TechPro II uses corrections that change with concentration and

temperature instead of single average values. (see Chart 1 on pg. 26).

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Myron-l TH1 User Manual Page 29