d width=10 nowrap>Yahoo! is not affiliated with the authors of this page or responsible for its content.
CONDUCTIVITY TRANSMITTER (v4) CDT128


ANALOG PROCESS CONTROL SERVICES PTY. LTD.
24 FRED ST, LILYFIELD 2040 N.S.W., AUSTRALIA
Fax 02 9555 1055
Tel 02 9555 1044
Page: 1
CONDUCTIVITY TRANSMITTER (v4) CDT128

No.

DS12841

Issue:
3
12/11/02

CONDUCTIVITY TRANSMITTER (v4) CDT128
DESCRIPTION
The CONDUCTIVITY TRANSMITTER CDT128 is a low cost
4-wire transmitter designed for any type of conductivity input
and process signal output. The CDT128 suits a wide range of
conductivity measurement applications using suitable probes.
Temperature compensation is also available as an option using
probes with a built-in NTC thermistor or any other suitable
compensation element. Excitation to the probe is via a low level
AC voltage with short circuit protection to maximise the life of
the probe. Final calibration is trimmed using the front accessible
'offs' and 'span' 15-turn trim adjustments. The output process
signal is indicated by the front L.E.D., giving a clear indication of
module function, presence of signal, and output loop continuity
(current outputs only). The Conductivity Transmitter has
input/output isolation avoiding grounding problems with
interfacing equipment due to the conductivity of the fluid forming
a connection to ground potential. RF and power transient
protection is standard as it is with all A.P.C.S. modules. Various
power supply choices are available varying from 240Vac down
to 8Vdc, all provide power isolation.

General Specifications
Size:
52 W x 70 H x 110 D (mm).
Mounting:
DIN-Rail, gear plate.
Termination:
Screw terminals on front.
Protection class:
IP40 (IP65 Enclosure opt.)
Weight:
0.300 kg.
Housing material:
Polycarbonate.
Accuracy:
0.2% of span.
Front OFFS adjust:
�20% typical
Front SPAN adjust:
�20% typical
Temperature effect:
0.01% per �C.
Operating temp. range:
-10...+60�C.
Storage temp. range:
-20...+70�C.
Input range:
1mS/cm up to 1000mS/cm.
Probe excitation:
800Hz bipolar square wave.
Output load effect:
less than 0.2% up to max. load.
Output loop drive:
10mA into 0 - 2000 .
20mA into 0 - 900 .
50mA into 0 - 360 .
Input/output isolation:
>2kV r.m.s.
Power requirements:
ac supply 4W, dc supply 3W.
Power supply Isolation:
2kV r.m.s.
Electromagnetic compatibility: Complies with AS/NZS 4251.1 (EN 50081.1)

Suitable conductivity probes with temperature compensation.
APCS: PR128-1, k=1.35, temperature compensation = 10k NTC.
AIC:
P-K1TBTH
Any other probes can be used provided the thermistor characteristic is available.
If temperature compensation is not required use standard probes.



For input / output combinations refer to TYPE NO. DESIGNATION overleaf.


ANALOG PROCESS CONTROL SERVICES PTY. LTD.
24 FRED ST, LILYFIELD 2040 N.S.W., AUSTRALIA
Fax 02 9555 1055
Tel 02 9555 1044
Page: 2
CONDUCTIVITY TRANSMITTER (v4) CDT128

No.

DS12841

Issue:
3
12/11/02

TYPE NO. DESIGNATION
Power Supply:

1 = 240V, 50/60Hz �10%.
*) 6 = 8 - 60Vdc Isolated.

2 = 120V, 50/60Hz �10%.
*) 7 = 48Vdc (use 6).

3 = 24V, 50/60Hz �10%.
*) 8 = 60 - 240Vdc Isolated.
*) 5 = 12Vdc (use 6).
*) 9 = Other (Specify).
Input:
Standard Probe K-factor
05 = 50
�
S/cm
#C

16 = 200mS/cm #D

#A - use 0.01
06 = 100
�
S/cm
#C

17 = 500mS/cm #D

#B - use 0.1

07 = 200
�
S/cm
#C

18 = 1000mS/cm #D

#C - use 1.0

08 = 500
�
S/cm
#C

21 = 2000mS/cm (k = 1.35).

#D - use 10.0
09 = 1000
�
S/cm
#C

22 = 5000mS/cm (k = 1.35).




10 = 2mS/cm
#C




11 = 5mS/cm
#C

01 = 1
�
S/cm #A
12 = 10mS/cm
#C

02 = 2
�
S/cm #B
13 = 20mS/cm
#C

03 = 5
�
S/cm #B
14 = 50mS/cm
#C
*) 50 = 2M ohm (current excitation)

04 = 10
�
S/cm #B
15 = 100mS/cm
#C
*) 99 = Other (Specify).

Output:

1 = 0 - 5V (50k min).
6 = 10 - 50mA (360 max).

2 = 0 - 10V (100k min).
7 = 0 - 10mA (1.8k max).

3 = 0 - 20mA (900 max).
8 = 1 - 5V
(50k min).

4 = 4 - 20mA (900 max).
*) 9 = Other
(Specify).

5 = 0 - 50mA (360 max).
Action:

1 = Direct.

2 = Reverse.
Options:

0 = None.
*) 1 = Temp. compensation (10k NTC).
*) 2 = Output ramp.

Connection Diagram



*) Price Extra.
In the interest of development and improvement, A.P.C.S. Pty. Ltd. reserve the right to amend, without notice, details contained in this publication. A.P.C.S. PTY. LTD. will accept
no legal liability for any errors, omissions or amendments.
CDT128 - X XX X X X