+GF+Signet low conductivity pH pure water electrode

+GF+Signet low conductivity pH pure water electrode

3-2726-LC-00 159 001 557 electrode, pH， Light bulb type glass, low conductivity, PT1000, 3/4 in. NPT thread*

PH system calibration

How to Calculate the Slope Efficiency of pH Electrode

Select two pH buffer solutions to check the performance of the pH probe, pH 4.01 and pH 7.00. The ratio of the measured potential (E2-E1) to the pH value (7.00-4.01) gives the slope of the line.

1. Read the mV potential generated in two calibration buffers.

2. Determine the slope (mV potential generated per pH unit).

3. Divide this number by the theoretical slope, pH 59.16 mV/@ 25 ° C, and multiply by 100.

Example 1

The pH electrode generates -12 mV in pH 7.00 buffer solution, at pH

+162 mV is generated in buffer solution 4.01.

160 mV -(-12 mV)=172 mV

172 mV/3 =57.33 mV/pH unit

57.33/59.16 x 100=96.9% efficiency

Example 2

PH electrode generates -45 mV in pH 7.00 buffer solution, pH

+115mV in buffer solution 4.01.

115 mV -(-45 mV)=160 mV

160 mV/3 =53.33 mV/pH unit

53.33/59 .16 x 100 =90.1%

In Example 2, a slope efficiency of 90.1% is acceptable, but an offset of -45 mV is not acceptable. Offset is possible It is the result of contamination or poisoning of the reference electrode. Slope offset

It may be the result of glass being etched or adhering to hard objects.

As the electrode ages, the slope gradually decreases, and a slope of 85% -105% is generally acceptable. If the bias value (pH 7.00) is>+/-45mv, the electrode should be replaced. When the electrode needs to

When seeking high accuracy, the offset and slope values need to be as close as possible to the theoretical values.

Please refer to the calibration section of the instrument manual for 2-point pH calibration. If it is a 4-20mA non display application, please refer to the calibration section of 2751 Smart Sensor Signal Amplifier for further instructions

Two point pH calibration.

Due to the constantly changing characteristics of pH electrodes, pH electrode calibration is an important task that must be frequently carried out in electrode standardization work. The electrode contains a gel

The instrument will be depleted, so it must be regularly readjusted to maintain the accuracy of the system. There are many factors that affect the performance of probes, including aging, temperature, coating, and chemicals. in

After cleaning and adjustment, the Signet pH electrode can be calibrated in two pH buffer solutions with different pH values (two-point calibration).

The pH electrode is calibrated by placing it in a buffer solution with a known pH and measuring the battery potential. The pH value is a linear function within the pH range of 2-11

Number, therefore two calibration points are required. The most common calibration buffers are 4.01 and 7.00 (@ 25 ° C). If the pH value is measured in the acidic to neutral range,

We recommend using buffer pH 4.01 and buffer pH 7.00 for calibration. If measuring alkaline samples, we recommend using buffer 7.00 and buffer

Perform calibration on 10.01.

The response of glass electrodes is mainly composed of two parameters: offset and slope. The theoretical output of the pH electrode is 0 when the pH is 7

MV. Offset is the deviation of pH value from the nominal value. In Signet transmitters, offset calibration is performed under the standard.

The slope of the glass electrode is the mV generated per pH unit (mV/pH). At 25 ° C, the theoretical slope is 59.16 mV/pH. Therefore, at pH 4.01

At pH 10.01 (with lower H+concentration), a potential of -177 mV will be generated (see Table 2). For a new electricity

In extreme terms, at pH 7.00, 0-15 mV will be generated, with a slope efficiency ranging from 93.2% to 103%. In Signet

In the transmitter, the manual slope calibration operation menu is located in SLOPE.

+GF+Signet low conductivity pH pure water electrode

description

The Signet2724-2726 and 2734-2736 series pH/ORP electrode products are designed to reduce maintenance time and enable

Using value.

• Unique DryLoc ® The connector provides quick assembly and reliable connection, including gold-plated contact surfaces and O-ring seals.

The design has extended the lifespan of the electrode by lengthening the path inside the reference chamber.

The selection of liquid receiving materials can withstand various industrial applications.

Multiple installation methods address the need for installation flexibility. Fix on the pipe using NPT and ISO7/1 R-inch threads

On the road, immerse it in a tank or directly install it on a similar installation accessory of SIGNET.

• Pair the 2724-2726 or 2734-2736 electrodes with the Signet 2751 smart sensor signal amplifier for programmability

Logic controllers (PLCs), SCADA systems, or data acquisition programs provide 4-20mA loop signals.

Storage chips can store production, manufacturing, calibration, and operational data.

-Production and manufacturing information (serial number, model, and factory glass impedance).

-Calibration information (factory calibrated pH/ORP, factory calibrated temperature, user calibrated pH/ORP, user calibrated)

Temperature, offset pH/ORP, and slope% pH/ORP.

-Operating data (sensor operating time, minimum and maximum measured pH/ORP, minimum and maximum measured temperature)

To achieve greater flexibility and unique features, please pair the 2724-2726 or 2734-2736 series with the 2751 Smart

Sensor electronics paired with 9900 transmitter, 9950 dual channel transmitter, or 0486 Profibus hub

Use it. Other features include electrode health monitoring through glass impedance measurement, glass breakage detection, and reference impedance measurement

Testing and diagnosis. Convenient remote calibration eliminates the hassle of on-site calibration.

Using digital (S ³ L) signal output, connect six 2724-2726 or 2734-2736 electrodes to an 8900 multiparameter

On the controller, use 6 2751 pH/ORP sensor signal amplifiers

Using digital (S ³ L) signal output, pair two 2724-2726 or 2734-2736 electrodes with two 2751 pH/ORP

The sensor signal amplifier is connected to a 9950 dual channel transmitter.

The electrodes 2724-2726 are recommended for general use applications.

2734-2736 electrodes are recommended for harsh applications.

The 2734-2736 electrode utilizes advanced reference technology to extend its lifespan in almost all applications.

Technical Specifications

General

Compatibility 2751 pH/ORP signal amplifier

2760 pH/ORP preamplifier (applicable only)

2724-2726 3K Balco 型）

PH temperature sensor:

PT1000 and 2751 signal amplifiers are compatible

Connect to PLC, 9900 transmitter,

8900 multi parameter controller,

9950 dual channel transmitter

3 K Ω Balco compatible with 2760 preamplifier

Connect to ........................ 8750 transmitter

Process connection 3/4NPT ISO7/1R3/4 thread or SIGNET fittings

wetted material

PH (2724&2726) polyphenylene sulfide, glass, ultra-high molecular weight polyethylene,

fluororubber

ORP (2725) polyphenylene sulfide, glass, ultra-high molecular weight polyethylene,

Fluororubber, platinum

PH (2734&2736) polyphenylene sulfide, glass, PTFE， fluororubber

ORP (2735) polyphenylene sulfide, glass, PTFE， Fluororubber, platinum

Weight .....................................0.25 kg (0.55 lb)

performance

efficiency

2724-2726 >97%@25 °C (77 °F)

2734-2736 >95%@25 °C (77 °F)

Efficiency reflects the "health" indicator of the new electrode

Efficiency is the actual slope value (mV/pH) at 25 ° C

Ratio to theoretical value of 59.16 mV/PH

95% to 100% efficiency, equivalent to a slope between 56.20 and

59.16mV /pH

measurement range

pH.........................................0 to 14

ORP. .....................................±2000 mV

3-2726-LC Low Conductivity Fluid (20 to 100 μ S/cm)

≤ 20 µ S/cm...... The flow rate should be controlled at 150 ml/min

A reliable and grounded system

3-2724-HF,3-2726-HF,3-2734-HF,3-2736-HF:

Glass resistant, with a pH value of 6 or below; Trace HF ≤ 2%

In applications with a concentration of 2% or lower, ordinary pH glass is used at a pH of 6 or below

They will all be eroded.

Environmental Requirements

Operating Temperature

2724-2726* -10 °C to 85 °C (14 °F to 185 °F)

2734-2736* 10 °C to 100 °C (50 °F to 212 °F)

**3-2724-HF,3-2726-HF,3-2734-HF,3-2736-HF 温度高

Best performance at 10 ° C (50 ° F)