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Conductivity Meter - 2402B
 

The 2402B conductivity meter is suitable for water, waste water or pure water conditioning in continuous or batch-type operating modes, for liquid chromato-graphy or for general chemical process monitoring. 

The accuracy is better than 0.5% at 2.25%/C between 15C and 120C.

Temperature coefficient of the cell is compensated either manually or automatically by an external Pt-100 platinum resistor probe within the range of 0C to 120C. The slope can be adjusted between 1.5%/C and 3.0%/C. Commercially available conductivity cells - K-factor 0.01, 0.1 and 1.0 cover a dynamic range from 0.01S to 20mS full scale. An internal synchronous rectifier eliminates the capacitive error currents induced by the cell cable.

The measuring signal is transferred to the output as a signal current of either 0...20mA or 4....20mA. Two floating limit or alarm contacts can be set over the entire range. Each can be defined as a normally open or as a normally closed contact. 

Supply lines and all other lines, either from or to the conductivity meter, are protected by internal noise limiters against HF- noise.

Cond_02-02

2402B

 

Technical Data 

Measuring ranges

0...2.000S K=0.1, K=0.01

0...20.00S K=1.0, K=0.1, K=0.01 

0...200.0S K=1.0, K=0.1, K=0.01 

0...2.000mS K=1.0, K=0.1, inductive cell 

0...20.00mS K=1.0, inductive cell 

0...200.0mS inductive cell

0...2.000S inductive cell

Range indicators

3 green lamps

Display

Red LED-display 3-digit, character high12.7mm

Accuracy

0.5%

Measuring frequency

80Hz...7kHz

Measuring amplitude

70mV and 150mV, conductive cell only

Step response

Time between a conductivity change from 0% to 100% or reverse, measured between 10% and 90% = 4 seconds

Temperature compensation

manual from 0 to 120C, automatic by an external Pt-100 platinum by 2 or 3-wire. The unit calculates with 25C when the Pt-100 sensor wires are broken

Temperature slope

0.00%/C (=without compensation) to 8.00%/C.

Conductivity of water

is measured and temperature compensated

Reference temperature

25C

Maximum length of cell cable

Cable capacity is compensated automatically. The max. capacity must be <0.02F

Limit or alarm contacts

two floating change-over contacts can be adjusted over the full range. Each can be defined as a normally open or normally closed contact by an internal slide switch

Adjustment of the limit contacts

Each limit value can be adjusted by a button on the front panel. The limit value is displayed by pressing the corresponding button and can be changed with the + or - button over the full measuring range

Status

Status: the limit status is indicated by two green lamps 

Hysteresis

10 parts fixed

Contacts rating

change over at 6A/230VAC with resistive load

Contact live

200`000 operations at max. load, 20`000`000 operation mechanically, without load 

Output current signal

0. . . 20mA or 4 . . . 20mA over the selected range. 0...20mA or 4...20mA can be defined by an internal slide switch which is accessible to the user. The output signal is galvanically isolated

Output impedance

>1MW at 20mA

Maximum load

>500W

Supply voltage

230V/50-60Hz, ca. 8VA

CE-Conformity

Fulfilled

Case

Black plastic case 96 x 96 mm

Mounting

2 mounting clamps

Terminals

2 plug-in screw terminals for supply, limit contacts and signals

Cut out

91 mm x 91 mm, Depth 158 mm.

Weight

670 grams (23.5 ounces)

Options

Different cell constants

Leak proof housing IP54

Supply voltages: 230VAC

Output signal voltage

Limit contacts with different hysteresis

Output current with signal isolation

 

Wiring 

Terminal

Description

1

Cond_02-0255Conductivity cell +

2

Conductivity cell -

3

Conductivity cell PE

4

Output current signal +

5

Output current signal -

6

Output current signal PE

7

Limit contact 2 norm. open

8

Limit contact 2 norm. closed

9

Limit contact 2 change over

10

Limit contact 1 norm. open

11

Limit contact 1 norm. closed

12

Limit contact 1 change over

13

Protective earth PE

14

Supply voltage N

15

Supply voltage L

16

Pt-100 platinum sensor wire 1

17

Pt-100 platinum sensor sense 1

18

Pt-100 platinum sensor wire 2

 

Probes 

 

M8836

M8836S

M8836S1

2401B-0.01

HS

HS-C1

Range

0...20S 

0...2000S 

0...10mS

Cell constant

K=0.01 

K=1.0

K=1.0

Accuracy

+/-2%

+/-2%

+/-2%

Temperature range

0...130C

-30...100C

0...60C

Internal temperature sensor

Pt-100, 2-wire

Pt-100, 2-wire

Pt-100, 2-wire

Time constant temperature sensor

60 sec

110 sec

90 sec

Electrode holder

Stainless steel

PTFE (Teflon)

PVC

Electrode body

Cr-Ni-Mo-alloy, quality 1.4435

Cr-Ni-alloy, quality 1.4337

Graphite

Thread

3/4" gas (cylindrical), with O-ring

3/4" gas (cylindrical), with O-ring

3/4" gas (cylindrical), with O-ring

Tool size

36mm

36mm

36mm

Max. Pressure

15bar

6bar

6bar

Probe diameter

18mm

21mm

21mm

Probe depth

44mm

44mm

44mm

Connector

DIN 40 050, IP67, cable connector included

DIN 40 050, IP67, cable connector included

DIN 40 050, IP67, cable connector included

Max. cable diameter

7.5mm

7.5mm

7.5mm, use shielded cable only

Options

Other temperature sensor

Other temperature sensor

Other temperature sensor

 

Wiring

M8836W