Sensorex CT-1000 Bedienungsanleitung

Specifications/Operating Instruction

Model CT-1000

General Description

The model CT-1000 (encapsulated miniature transmitter) is a 2-wire, 4-20mA blind conductivity

transmitter featuring encapsulated construction, high performance and compact size.

Connect a conductivity cell of k=0.1 or 1.0 to it to then transform the output to a 4-20mA current

proportional to the conductivity level. This output may be transmitter over 2 wires to a control

location. The same 2 wires provide power to the transmitter. Any DC power supply from

12 to 36V DC may be used. There are two adjustments on the transmitter to standardize the

conductivity output marked as “SPAN” and “ZERO”. The output can be monitored with a loop-

powered meter, a loop resistor or a multimeter during the standardization process.

SPECIFICATIONS

Input: ………………………………………. 0-100,000 uS (see range

label on transmitter)

Output: ………………………………………4-20mA

Power Supply: ……………………………….12-36V DC

Load Resistor: ……………………………….0-750

at 24V DC

Linearity: …………………………………… + 0.02uS

Operating Temperature Range: ………………-25 to 70

Reverse Polarity Protection: …………………Internal diode

Dimensions: …………………………………1.5” x 2.0” x 1.0”

Maximum sensor to transmitter distance ….. DO NOT EXCEED 25ft.

Installation

1. Two 6-32 mounting holes 9” centers are provided. The transmitter can be mounted in a

head, weather-proof box, or DIN rail.

2. The output wires are isolated from ground; connections are made at the terminal strip

observing polarity to the terminals marked + , -out. These wires are to be connected to a

DC power supply through a load resistor. The wires can be as long as necessary.

Connect the ground terminal to earth ground.

3. The loop resistor can be either in the positive or negative power supply lead. The value

of the loop resistor depends on the voltage required at the monitoring location. Calculate

the required power supply voltage from the following equation:

minimum Vpower supply = 12 + (0.02 x Rloop)

A convenient value for the loop resistor (Rloop) might be 250Ωand so the minimum power

voltage would be:

minimum Vpower supply = 12 + (0.02 x 250) = 17V DC

The maximum supply voltage is 36V DC.

4. Connect sensor to transmitter by matching wire color to designated color on terminal

block (i.e. electrode’s red wire to terminal block “RED”, …)

5. Turn the unit on end with the conductivity cell in the air and adjust the “ZERO” to an

output current of 4.00mA

6. Put the conductivity cell in a conductivity solution that exceeds the highest expected

value and adjust “SLOPE” to an output current of 20.00mA

7. SPECIAL NOTE: The transmitter is supplied with a 10K resistor in place of where the

temperature compensation can be connected. Leave the resistor in place if your

electrode does not have temperature compensation (2-wires only). Remove the resistor

if your electrode has 3 wires.

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