ProMinent DULCOMETER D1C A D Series, DULCOMETER D1C A W Series Operating Instructions Manual

Operating Instructions

DULCOMETER® D1C

Part 2: Adjustment and Operation,
Measured Variable Redox/ORP

®

ProMinent

D1C2-001-D

Redox/ORP

STOP

START

mV

750

DULCOMETER

Redox/ORP

750

DULCOMETER

STOP

START

Type WType D

mV

D1C A

___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___

Please enter the identity code of your device here.

Please completely read through operating instructions! · Do not discard!

The operator shall be liable for any damage caused

Part No. 987850 ProMinent Dosiertechnik GmbH · 69123 Heidelberg · Germany BA DM 183 10/10 EN

by installation or operating errors!

1 Device Identification / Identity Code

D1C A DULCOMETER® Controller Series D1C / Version A

Type of mounting

D Control panel installation 96 x 96 mm

W Wall mounting

Operating voltage

0 230 V 50/60 Hz
1 115 V 50/60 Hz
2 200 V 50/60 Hz (only with type of mounting D)
3 100 V 50/60 Hz (only with type of mounting D)
4 24 V AC/DC

Measured variable

R Redox/ORP (-1000...+1000 mV)

Connection of measured variable

1 Terminal, standard signal 0/4-20 mA
2 SN6 connector
5 Terminal mV

Correction variable

0 None

Feed forward control

0 None
1 via standard signal 0/4-20 mA
2 via frequency 0-500 Hz
3 via frequency 0-10 Hz

Control input

0 None
1 Pause

Signal output

0 None
1 standard signal 0/4-20 mA measured value
2 standard signal 0/4-20 mA control variable
42 standard signal outputs 0/4-20 mA, freely programmable

Power control

G Alarm and 2 limit value/timer relays
M Alarm and 2 solenoid valve relays
R Alarm relay and servomotor with feedback

0 None
2 Two pumps

Pump control

Control characteristics

0 None
1 Proportional control
2 PID control

Log output

0 None

Language

D German
E English
F French

I Italian
N Dutch
S Spanish
PPolish
ASwedish
B Portuguese
U Hungarian

J Japanese

G Czech

D1C A

Please enter the identity code of your device here!

2

2 General User Information

Page

1 Device Identification / Identity Code ....................................................................................................... 2

2 General User Information ......................................................................................................................... 3

3 Device Overview / Controls ..................................................................................................................... 4

4 Functional Description ............................................................................................................................. 5

5 Display Symbols ...................................................................................................................................... 6

6 Operation ................................................................................................................................................. 7

7 Restricted Operating Menu ..................................................................................................................... 8

Layout .............................................................................................................................................. 8

Description ...................................................................................................................................... 9

8 Complete Operating Menu .................................................................................................................... 12

Overview ........................................................................................................................................ 12

Description .................................................................................................................................... 13

9 Fault / Remarks / Troubleshooting ........................................................................................................ 24

General User Information

These operating instructions describe the technical data and function of the series DULCOMETER® D1C
controller, provide detailed safety information and are divided into clear steps.

IMPORTANT

• Please observe the parts of these operating instructions applicable to your particular
version! This is indicated in the Section “Device Identification / Identity Code”.

• Correct measuring and dosing is only possible in the case of impeccable operation of the
probe. The probe has to be calibrated / checked regularly!

NOTE

A form “Documentation of controller settings type D1C” is available under
www.prominent.com/documentation_D1C for the purpose of documenting the controller
settings.

3

3 Device Overview / Controls

"Change"

Button

"Branch back"

Button

"Down"

Button

Redox/ORP

STOP

START

Display field
Measured variable
Redox/ORP

Graphic
display

®

"Start/stop"
Button

"Enter"
Button

"Up"
Button

STOP

START

CHANGE button

To change over within a menu level
and to change from one variable to
another within a menu point.

START/STOP button

Start/stop of control and metering
function.

ENTER button

To accept, confirm or save a displayed
value or status. For alarm acknow­ledgement.

D1C2-002-GB

UP button

To increase a displayed numerical value
and to change variables (flashing
display)

BRANCH BACK button

Back to permanent display or to start
of relevant setting menu.

DOWN button

To decrease a displayed numerical
value and to change variables (flashing
display).

4

4 Functional Description

NOTE

Please refer to the description of the complete operating menu in Section 8 for a detailed
description of the individual characteristics of the DULCOMETER® D1C controller!

4.1 Operating Menu

The D1C controller permits settings to be made in two different menus. All values are preset and can be
changed in the complete operating menu.

The controller is delivered with a restricted operating menu so that the D1C controller can be used
effectively in many applications from the very onset. If adaptations prove to be necessary, all relevant
parameters can then be accessed by switching over to the complete operating menu (see “General
Settings”).

4.2 Access Code

Access to the setting menu can be prevented by setting up an access code. The D1C controller is supplied
with the access code 5000 which permits free access to the setting menu. The calibration menu remains
freely accessible even if access to the setting menu is blocked by the code.

4.3 Control

The D1C can operate as a proportional controller or as a PID controller - depending on the device version
(see identity code) and the setting.

The controlled variable is recalculated once a second. Control procedures which require rapid correction of
setpoint deviations (less than approx. 30 seconds) cannot be processed with this controller. The cycle
times must be taken into consideration when activating solenoid valves (pulse length) in the same way as
their running times when activating servomotors (3-point).

Via the control input pause, the control function (selection of controlled variable) can be switched off. The
calculation of the controlled variable starts again after cessation of "pause".

4.4 Feed Forward Control

The D1C controller can process a signal of a feed forward control. Depending on the device version (see
identity code) and the setting, this signal can be obtained in any form of a 0–20 mA or 4–20 mA signal or as
a digital contact signal with the maximum frequencies 10 Hz or 500 Hz.

This signal can be used, for example, for flow-proportional metering (multiplicative effect) or feed forward­dependent basic load metering (additive effect). The result of control variable calculation from the
proportional or PID control is multiplied by or added to the feed forward signal. A multiplicative feed forward
variable at the level of the set rated value carries over the calculated controlled variable unchanged into the
control variable:

Control variable = Feed forward variable/rated value x calculated controlled variable

During start-up, the zero point has to be checked. The feed forward control is not designed for switching off
permanently the actuating variable (signal ≈ 0).

An additive feed forward variable at the level of the rated value results in maximum control variable:

Control variable (max. 100 %) = (Feed forward variable/rated value x

max. control variable) + calculated controlled variable

4.5 Error Messages

Error messages and information are indicated on the bottom line in the permanent display 1. Errors to be
acknowledged (acknowledgement switches off the alarm relay) are indicated by the "
which still apply after acknowledgement are indicated alternately. During correction variable processing

(temperature for correction of pH-value), the value is indicated in the same line as the error/note. Faults
which are rectified of their own accord due to changed operating situations are removed from the
permanent display without the need for acknowledgement.

". Errors/notes

5

5 Display Symbols

The display of the DULCOMETER® D1C controller uses the following symbols:

Description Comment Symbol

Limit value transgression Symbol

Relay 1, upper left

Symbol

Relay 1, lower left

Symbol

Relay 2, upper right

Symbol

Relay 2, lower right

Metering pump 1 (oxidant) Symbol

Control off left

Symbol

Control on left

Metering pump 2 (reducing agent) Symbol

Control off right

Symbol

Control on right

Solenoid valve 1 (oxidant) Symbol

Control off left

Symbol

Control on left

Solenoid valve 2 (reducing agent) Symbol

Control off right

Symbol

Control on right

Servomotor

Control, open relay

Control, close relay

Without control

Thickness of bar

Position feedback increases from left to right

during opening

Stop button pressed

Manual metering

Fault

6

6 Operation

Permanent

display 1

Permanent

display 2

Calibration

menu

Various

Setting menus

Access code

The various menus are selected with
the CHANGE button

The menu is started with
the ENTER button

BRANCH BACK to permanent display
or to relevant setting menu

Calibration notes

Access code, correct

Parameter
setting

D1C2-007-GB

NOTE

Access to the setting menus can be barred with the access code!

The number and scope of setting menus is dependent on the device version!

If the access code is selected correctly in a setting menu, then the following setting menus are
also accessible!

If within a period of 10 minutes no button is pushed, the unit automatically branches back from the
calibrating menu or a setting menu to the permanent display 1.

BRANCH BACK without
saving setting

BRANCH BACK to
start of setting

Variables flash

Text 1

Selection 1

Text 2

Selection 2

Text 1

Selection 1

Text 2

Selection 2

CHANGE from selection to selection

Change numbers or
settings of selection

ENTER and save setting,
continue to next menu

D1C2-008-GB

7

7 Restricted Operating Menu / Layout

The restricted operating menu permits simple operation of the most important parameters. The following
overview shows the settings which can be selected.

mV

750

mea. val.
fd. fwd.:
reg. val.:
w: 750 mV

check probe
ORP

limits
setting ?

750 mV

70 %
59 %

Permanent display 1

Permanent display 2
only with control
(w = setpoint)

check probe
ORP
probe in buffer
460 mV

limit 2

900 mV

limit 1

100 mV

upper

lower

Positive values of setting variable:
Negative values of setting variable:

check probe
measurement act.
please wait !
460 mV

check probe
ORP
value:
buffer:

Number and scope of setting menus

is dependent on the device.

Access to setting menus can

be blocked with access code.

Oxidant agent
Reducing agent

460 mV
465 mV

control
settings ?

Setting in
complete
operating
menu

general setting
information

Only with control

control
regulated value:
positive oxide
negative reduc

control
normal
current regulat.
value: 30 %

or

control
with dead zone
current regulat.
value: 30 %

or

control
manual
current regulat.
value: 30 %

ident-code: D1CA
DxRxxxxxxxxxx
Software version
D1C-A1 FW-5.00

For normal control

setpoint

750 mV

Control with dead zone

setpoint 2 upper

750 mV

setpoint 1 lower

650 mV

Proportional control

ctrl. parameter
xp =

PID control

ctrl. parameter
xp =

Ti =
Td =

For manual control

manual dosing

15 %

regulated range

alarm relay access c.:
active

operating menu:

english

=
=

restricted

10 %

10 %

0 s
0 s

5000

D1C2-010-Redox-GB

8

Restricted Operating Menu / Description

mV

Permanent display 1

750

mea. val.
fd. fwd.:
reg. val.:
w: 750 mV

750 mV

70 %
59 %

Permanent display 2
only with control
(w = setpoint)

Checking the Redox Probe

During calibration, the D1C sets the command outputs to “0”. Exception: if a basic load or a manual control
variable was set, these are maintained during calibration. The standard signal outputs mA (measuring value
or correction value) are frozen. The measured value or the standard buffer value 220 mV or 465 mV is
proposed as the buffer value; this value is adjustable (arrow keys). After everything has been checked, all
error tests which refer to the measured value are restarted.

check probe
ORP

check probe
ORP
probe in buffer
460 mV

Positive values of setting variable:
Negative values of setting variable:

check probe
measurement act.
please wait !
460 mV

check probe
ORP
value:
buffer:

Oxidant agent
Reducing agent

D1C2-011-Redox-GB

460 mV
465 mV

= automatic timing

Permanent display 1

Possible values

Initial value Increment Lower value Upper value Remarks

Buffer values Measured valve 1 mV -2000 mV +2000 mV
185–265 mV 220 mV
425–505 mV 465 mV

Error message Condition Effect

Measured value high Measured value Return to permanent display:

40 mV > buffer Basic metering load

Measured value low Measured value "

40 mV < buffer

D1C2-012-Redox-GB

9

Restricted Operating Menu / Description

Limits

Access to all setting menus can be blocked with an access code !

limits
setting ?

limit 2

900 mV

limit 1

100 mV

upper

lower

D1C2-014-GB

Possible values

Initial value Increment Lower value Upper value Remarks

Type of limit trans- upper Limit transgression
gression Limit 1: lower lower when exceeding or

Limit 2: upper off* dropping below value

*only with limit relay

Limit value Limit 1: 500 mV 1 mV -2000 mV 2000 mV

Limit 2: 1000 mV 1 mV -2000 mV 2000 mV

Control

Access to all setting menus can be blocked with an access code !

Note: The controlled variable is recalculated every second. Only

suitable for processes with time constants greater than 30 s !

control
settings ?

Only with control

Setting in
complete
operating
menu

control
regulated value:
positive oxide
negative reduc

control
normal
current regulat.
value: 30 %

or

control
with dead zone
current regulat.
value: 30 %

or

control
manual
current regulat.
value: 30 %

Positive values of setting variable:
Negative values of setting variable:

For normal control

setpoint

750 mV

Control with dead zone

setpoint 2 upper

750 mV

setpoint 1 lower

650 mV

Proportional control

ctrl. parameter
xp =

PID control

ctrl. parameter
xp =

Ti =
Td =

For manual control

manual dosing

15 %

regulated range

Oxidant agent
Reducing agent

10 %

10 %

0 s
0 s

D1C2-015-Redox-GB

10

Restricted Operating Menu / Description

Possible values

Initial value Increment Lower value Upper value Remarks

Setpoint 750 mV 1 mV lower limit upper limit 2 setpoints necessary

measuring range measuring range for control with dead zone.

Setpoint 2 > setpoint 1

Control parameter xp 10 % 1 % 1 % 500 % xp referred to measuring range

Control parameter Ti off 1 s 1 s 9999 s Function off = 0 s

Control parameter Td off 1 s 1 s 2500 s Function off = 0 s

Manual metering 0 % 1 % -100 % +100 %

Abbreviations for control variables:

x

= 100 %/Kp (inverse proportional coefficient)

p

Ti=I controller integration time [s]
Td=D controller differential time [s]

General Settings

Access to all setting menus can be blocked with an access code !

general setting
information

Initial value Increment Lower value Upper value Remarks

Alarm relay active active

Access code 5000 1 1 9999

Language as per identity as per identity

Operating menu restricted restricted

ident-code: D1CA
DxRxxxxxxxxxx
software version
D1C-A1 FW-5.00

Possible values

not active

code code

complete

alarm relay access c.:
active

operating menu:

english

=
=

restricted

5000

D1C2-016-GB

Access Code

Access to the setting menu can be prevented by setting up an access code. The DULCOMETER
controller is supplied with the access code 5000 which permits free access to the setting menu. The
calibration menu remains freely accessible even if access to the setting menu is blocked by the code.

®

D1C

11

8 Complete Operating Menu / Overview

All parameters of the controller can be set in the complete operating menu (access see previous page). The
following overview shows the settings which can be selected:

mV

750

mea val.
fd. fwd.:
reg. val.:
w: 750 mV

check probe
ORP

meas. value
setting ?

pumps
setting ?

750 mV

70 %
59 %

Permanent display 1

Permanent display 2
only with control
(w = setpoint)

Number and scope of setting menus

is dependent on the device.

Access to setting menus can

be blocked with access code.

Only with pumps

relays
setting ?

limits
setting ?

servomotor
setting ?

control
setting ?

feed forward ctrl.

setting ?

Only with limit relay,
solenoid valve relay
or servomotor

Only with
servomotor

Only with control

Only with feed
forward control

signal output 1

mA setting ?

signal output 2

mA setting ?

general setting
information

Only with standard
signal output

Only with 2 standard
signal outputs

12

D1C2-017-Redox-GB

Complete Operating Menu / Description

mV

Permanent display 1

750

mea. val.
fd. fwd.:
reg. val.:
w: 750 mV

750 mV

70 %
59 %

Permanent display 2
only with control
(w = setpoint)

Checking the Redox Probe

During calibration, the D1C sets the command outputs to “0”. Exception: if a basic load or a manual control
variable was set, these are maintained during calibration. The standard signal outputs mA (measuring value
or correction value) are frozen. The measured value or the standard buffer value 220 mV or 465 mV is
proposed as the buffer value; this value is adjustable (arrow keys). After everything has been checked, all
error tests which refer to the measured value are restarted.

check probe
ORP

check probe
ORP
probe in buffer
460 mV

Positive values of setting variable:
Negative values of setting variable:

check probe
measurement act.
please wait !
460 mV

check probe
ORP
value:
buffer:

Oxidant agent
Reducing agent

D1C2-018-Redox-GB

460 mV

465 mV

= automatic timing

Permanent display 1

D1C2-019-Redox-GB

Possible values

Initial value Increment Lower value Upper value Identification code expression

Buffer values Measured value 1 mV -2000 mV +2000 mV if measured variables 2 and 5
185–265 mV 220 mV are connected

425–505 mV 465 mV – +1000 mV if measured variable 1 is connected

Error message Condition Effect

Measured value high Measured value Return to permanent display:

40 mV > buffer Basic metering load

Measured value low Measured value Return to permanent display:

40 mV < buffer Basic metering load

13

Complete Operating Menu / Description

Measured Value

Access to all setting menus can be blocked with an access code !

Standard signal input mA

meas. value
range adjustment

meas. value
setting ?

4 mA

= 0 mV

meas. value
checkout time
measured value

off

IMPORTANT

When changing the range adjustment, the adjustments in all menus have to be checked!

Possible values

Initial value Increment Lower value Upper value Remarks

meas. value
range adjustment

20 mA =

1000 mV

D1C2-020-Redox-GB

Standard signal input 4 mA 0 mA
lower signal limit 4 mA

Allocated 0–1 V 1 mV -2000 mV +2000 mV
probe voltage

Checkout time off 1 s 1 s 9999 s Constant measurement

signal results in message

and alarm.

Function off = 0 s

Control Time Measuring Value

IMPORTANT

This function may not be activated for applications where it can be assumed that the
measuring value does not change.

This function checks whether the measuring value from the sensor (measuring value input) changes within
the “control time measuring value”. It is assumed that the value does not change for an intact sensor.

If the measuring value does not change during this control time, the DULCOMETER

®

D1C sets the control

output to “0” and the alarm relay drops out. The LCD display shows e.g. the message “check mV-probe”.

14

Complete Operating Menu / Description

Correction Value*

Access to all setting menus can be blocked with an access code !

correction value
setting ?

correction value
temperature

automatic

*In the setting menu “correction value” for this equipment enables you to display the temperature or to
maintain an mA signal proprotional to the temperature. No temperature adjustment is made to the
measured variable!

Pumps

Access to all setting menus can be blocked with an access code !

Only with pumps for control

pumps
setting ?

control ORP

pump1 oxide
pump2 reduc

dosing pump max.
pump1:
pump2:

180
180

pulse/minute

D1C2-022-Redox-GB

Possible values

Initial value Increment Lower value Upper value Remarks

Max. stroke/minute of 180 1 1 500 off = 0 strokes/min
pumps 1 and 2

Relay for power control

Access to all setting menus can be blocked with an access code !

Only with limit relay, solenoid valve relay or servomotor

relays
setting ?

relay adjustment
relay1:
relay2:

SV1
SV2

solenoid valve 1
oxide
period
min. time

10 s

1 s

solenoid valve 2
reduc
period
min. time

10 s

1 s

D1C2-023-Redox-GB

15

Complete Operating Menu / Description

with timer

relays
setting ?

relay adjustment
relay1: timer
relay2: timer

control timer 1

relay 1
period 1 h
t on: 1 min

control timer 2

relay 2
period 1 h
t on: 1 min

D1C2-033-Redox-GB

Possible values

Initial value Increment Lower value Upper value Remarks

Relay adjustment as per

identity code

Relay 1 Solenoid valve 1

Limit value 1* *For “limit value”, the relays

Actuator 1 remain active, even in the

Timer 1 event of a fault.

Servomotor only with servomotor

off

Relay 2 Solenoid valve 2

Limit value 2*

Actuator 2

Timer 2

off

Cycle 10 s 1 s 10 s 9999 s for solenoid valve
min. time 1 s 1 s 1 s Cycle/2 for solenoid valve

Set here the smallest

permitted operating factor

of the connected device.

Period (Cycle) off 1 h 1 h / off 240 h for timer
t on 1 min 1 min 1 min 60 min for timer

NOTE
The limit value relay can be defined in such a way as to respond as an actuator, i.e. if a limit

value relay closes a circuit, it opens when a pause contact is activated and/or for a
subsequent delay period td (if td is set to > 0 min in “General settings”).

Cycle

t

Timer relay

on

off

on

IMPORTANT

The timer will be reset if there is a drop in the power supply.

16

t

Complete Operating Menu / Description

At the end of the (timer) cycle time, the DULCOMETER® D1C closes the assigned relay for the duration of
“t on” (timer). “Pause” interrupts the timer.
When the clock is shown in the LC display, the timer can be reset to the start of the cycle at precisely this
point using the Enter button.
The % figure in the LC display indicates the progress of the current cycle.
Timer relays may be used, e.g. for shock metering or sensor cleaning.

Cycle

Solenoid
valve

on

off

on

off

The switching time of the DULCOMETER® D1C (solenoid valve) depends on the actuating variable and the
“min. time” (smallest permitted operating factor of the connected device).
The actuating variable determines the ratio ton/cycle and thus the switching times (see fig. above).
The “min. time” influences the switching times in two situations:

a) theoretical switching time < min. time:

Cycle

min. time

on

off

Cycle

on

off

t

on

t

on

Cycle

Cycle

Cycle

Cycle

Cycle

min. time

min. time

Control
variable: 80 %
t

on

Cycle

t

Control
variable: 50 %
t

on

Cycle

t

theoretical

t

actual

t

= 0.80

= 0.50

The DULCOMETER® D1C does not switch for a certain number of cycles until the sum of the theoretical
switching times exceeds the “min. time”. Then the
total time

.

b) theoretical switching time > (cycle - min. time) and calculated switching time < cycle

Cycle

min. time

on

off

Cycle

on

off

The DULCOMETER® D1C does not deactivate for a certain number of cycles until the differences between
cycle and theoretical switching time exceed the “min. time”.

Cycle

Cycle

DULCOMETER® D1C

Cycle

Cycle

min. time

t

t

switches for the duration of this

theoretical

actual

17

Complete Operating Menu / Description

Limits

Access to all setting menus can be blocked with an access code !

limits
setting ?

limit 2 upper
800 mV
limit 1 lower
100 mV

relay 1 LV 1

- active closed

∆t on 0 s
∆t off 0 s

hysteresis
limits: 10 mV
∆t on: off
control: on

relay 2 LV2

- active closed

∆t on 0 s
∆t off 0 s

D1C2-024-Redox-GB

Possible values

Initial value Increment Lower value Upper value Remarks

Type of limit transgression upper Limit transgression when

Limit 1: lower lower exceeding or dropping below value
Limit 2: upper off* *only with limit relay

Limit value Limit 1: 500 mV 1 mV -2000 mV 2000 mV

Limit 2: 1000 mV 1 mV -2000 mV 2000 mV

Hysteresis limits 10 mV 1 mV 10 mV 2000 mV Effective in direction of cancelling

limit transgression

Checkout time limits off 1 s 1 s 9999 s Results in message and alarm.

off = 0 s:
Function switched off,
no message, no alarm

Control on on

off

Actuating direction active closed active closed Reacts as make contact
limit value 1; active open Reacts as break contact
limit value 2

Switch-on delay ∆t on 0 s 1 s 0 s 9999 s

Switch-off delay ∆t off 0 s 1 s 0 s 9999 s

If the limit is exceeded for longer than the “Delay time - limit values”, an error message is given which
must be acknowledged, and the alarm relay circuit is broken. If “Control” is also set to “off” the control
process stops.

18

Complete Operating Menu / Description

Servomotor

The operating range is defined by the total resistance range of the feedback potentiometer. The maximum
limit of the range actually used is set by defining the control range.

IMPORTANT

• To ensure correct operation, the activation time of the actuator used should not be less
than 25 seconds for the control range from 0…100 %!

• Activation of the servomotor must be carried out with the same meticulous care as taken
when calibrating a measuring probe.

Access to all setting menus can be blocked with an access code !

Only with servomotor

servomotor
setting ?

servomotor
setting
current position:

servomotor
open ?

servomotor
open
please wait !

servomotor
opened !
value take over ?

servomotor
OK
current position:

servomotor
close ?

dosing:
control range:
0 % to
operating range

oxide

100 %

servomotor
close
please wait !

servomotor
closed !
value take over ?

= automatic timing

D1C2-025-Redox-GB

Possible value

Initial value Increment Lower value Upper value Remarks

Servomotor Setting Setting

ok

off

Control direction Oxidant Oxidant

Reducing

Control range 100 % 1 % 10 % 100 % in % of operating range

NOTE

• If the broad bar is to the far right, the servomotor is fully open.

• The continuous display shows the degree (in %) to which it is open (the greater the percentage,
the more open the servomotor).

19

Complete Operating Menu / Description

Control

Access to all setting menus can be blocked with an access code !

Note: The controlled variable is recalculated every second. Only

suitable for process with time constants greater than 30 s !

control
settings ?

Only with control

control
regulated value:
positive oxide
negative reduc

control

normal
current regulat.
value: 30 %

Positive values of setting variable:
Negative values of setting variable:

For normal control

setpoint

750 mV

Control with dead zone

setpoint 2 upper

750 mV

setpoint 1 lower

650 mV

For manual control

manual dosing

15 %

regulated range

Oxidant agent
Reducing agent

Proportional control

ctrl. parameter
xp =

10 %

PID control

ctrl. parameter
xp =

Ti =
Td =

control load:

regulated range

10 %

0 s
0 s

10 %

D1C2-026-Redox-GB

Possible values

Initial value Increment Lower value Upper value Remarks

Control normal normal When controlling with dead zone,

with dead zone the feed forward control is not used

manual for measured values within

the dead zone.

2 setpoints necessary for

Lower limit Upper limit control with dead zone.

Setpoint 750 mV 1 mV measuring range measuring range Setpoint 2 > setpoint 1
Control parameter xp 10 % 1 % 1 % 500 % xp referred to measuring range
Control parameter Ti off 1 s 1 s 9999 s Function off= 0 s
Control parameter Td off 1 s 1 s 2500 s Function off = 0 s
Additive basic load 0 % 1 % -100 % +100 %
Manual metering 0 % 1 % -100 % +100 %

Abbreviations for control variables:

x

: 100 %/Kp (inverse proportional coeffizient)

p

: Integration time of I-controller [s]

T

i

: Differential time of D-controller [s]

T

d

20

Complete Operating Menu / Description

Feed Forward Control

feed forward ctrl.
setting ?

feed forward ctrl.
Hz / mA
10 Hz

feed forward ctrl.
rated value:

10.00 Hz

feed forward ctrl.
disturb. variable:
additive

feed forward ctrl.
max. additive
regulated value:
100 %

D1C2-029-Redox-GB

Possible values

Initial value Increment Lower value Upper value Remarks

Feed forward control as per identitiy None Signal processing:
(Flow) code 10 Hz Signal <0.02 Hz = no flow

500 Hz Signal <0.2 Hz = no flow

Standard signal: 0…20 mA Signal <0.2 mA = no flow

4–20 mA 4…20 mA Signal <4.2 mA = no flow

Feed forward control 10 Hz 0.01 Hz 0.1 Hz 10 Hz Depending on signal type.
rated value 500 Hz 1 Hz 5 Hz 500 Hz Maximum limitation

20 mA 0.1 mA 0/4 mA 20 mA of range used.

Feed forward
control multiplicative multiplicative

Feed forward
control effect additive

Max. add. regulated only with add. feed
variable 100 % 1 % -500 % +500 % forward control

Standard Signal Output 1

Access to all setting menus can be blocked with an access code !

Only with standard signal output

signal output 1

mA setting ?

signal output 1

mA

measured value

0…20 mA

Control with standard signal

control
regulated value:
positive oxide
negative reduc

signal output 1

measured value
0 mA =

20 mA =

0 mV

1000 mV

signal output 1

regulated value
0 mA =

20 mA =

0%

100%

D1C2-027-Redox-GB

21

Complete Operating Menu / Description

Standard Signal Output 2

Access to all setting menus can be blocked with an access code !

Control with standard signal

control
regulated value:
positive oxide
negative reduc

signal output 2

measured value
0 mA =

20 mA =

0 mV

1000 mV

signal output 2

mA setting ?

Only with 2 standard signal outputs

signal output 2

mA

measured value

0…20 mA

Possible values

Initial value Increment Lower value Upper value Remarks

Variable allocation as per identity Measured value

code Controlled variable If control applicable

Output range 0…20 mA 0…20 mA

4…20 mA

3.6/4-20 mA Reduction to 3.6 mA

Range measured
value 0–1 V 1 mV -2000 mV 2000 mV Minimum range 10 mV

Range controlled
variable 0 %…+100 % 1 % -100 % +100 % Minimum range 1 % of

signal output 2

regulated value
0 mA =

20 mA =

0%

100%

D1C2-030-Redox-GB

when alarm relay switches

(not limit value violation)

measured value

General Setting

Access to all setting menus can be blocked with an access code !

general setting
information

22

ident-code: D1CA
DxRxxxxxxxxxx
software version
D1C-A1 FW-5.00

alarm relay

active

pause normal

- active... closed

- alarm off

- td: 0 min

access c.:
operating menu:

english

=
=

complete

5000

D1C2-028-GB

Complete Operating Menu / Description

Possible values

Initial value Increment Lower value Upper value Remarks

Alarm relay active active

not active

Pause normal normal

Hold

Control input pause active closed active closed Reacts as make contact

active open Reacts as break contact

Pause with alarm off off Alarm relay can be

on triggered by pause contact

td 0 min 1 min 0 min 60 min

Access code 5000 1 1 9999

Language as per identity as per identity

code code

Operating menu complete restricted

complete

Standard Pause

If the pause switch is off, the DULCOMETER® D1C sets the operating outputs to “0” for as long as the
pause switch is off or for a set time-delay td (if td is set to > 0 min). Whilst the pause switch is off, the D1C
establishes the P-proportion in the background.
With PID control (Identity code characteristics “control characteristic” = 2): the I-proportion is stored when
the pause is switched off (I-proportion then usually only present if Ti > 0 has been selected in the “Control
setting?” setting menu).
Exception: the standard signal outputs mA for the measured value or correction value are not affected by
the pause.
After pause is activated, the operating outputs remain at “0” for the length of the time delay td. The time
delay td must be set up in such a way that in this time e.g. sample water (process-specific current
concentration) flows to the sensor.
With PID control (Identity code characteristics “control characteristic” = 2): The control variable output
resulting from the pause and the expiry of the time-delay td is reconciled jointly with the current
P-component and (if Ti is set > 0) with the stored I-component.

Pause Hold

If the pause switch is off, the DULCOMETER® D1C freezes the operating output at the most recent value for
as long as the pause switch is off or for a set time-delay td (if td is set to > 0 min). Whilst the pause switch is
off, the D1C establishes the P-proportion in the background.
With PID control (Identity code characteristics “control characteristic” = 2):
Even the mA standard signal outputs for measured value or correction value are frozen.
After pause is activated, the operating outputs remain frozen for the length of the time delay td. The time
delay td must be set up in such a way that in this time e.g. sample water (process-specific current
concentration) flows to the sensor.
With PID control (Identity code characteristics “control characteristic” = 2): The control variable output
resulting from the pause and the expiry of the time-delay td is reconciled jointly with the current
P-proportion and (if Ti is set > 0) with the newly established I-proportion.

Access Code

Access to the setting menu can be prevented by setting up an access code. The DULCOMETER® D1C
controller is supplied with the access code 5000 which permits free access to the setting menu. The
calibration menu remains freely accessible even if access to the setting menu is blocked by the code.

23

9 Fault / Remarks / Troubleshooting

* Depends on whether “alarm off” or “alarm on” in “General Settings”.

During servomotor setting

Position feed back wrong

Upper position <40 % max. value

Lower position >30 % range

Final value small

Direction check

Final value big

unsteady

Measured 40 mV > buffer

During checking sensor Basic load Stop No No error processing –

Measured 40 mV < buffer

Probe signal too unsteady

Measured value high

Measured value low

Measured value

Stop button

Pause/Hold

Stop

Basic load Stop No Check probe,

Stop Stop No Relay drops out –

Operation Note text Symbol Effect Alarm with Remarks Remedy

Pause contact

Pause

on metering on control

Stop Stop No/Yes*

Servomotor

Electronics error

Position not reached

Servomotor defective

System error

Stop Stop Yes Electronic data defective Call in servive

Control “on” Yes

Control “off” Stop or Stop Yes

after checkout time

mV-limit value 2

basic load

Feed forward control

Signal drops below value

Signal exceeded

Limit transgression

multiplicative stop continue or >23 ±0.2 mA transducer and cable

additive continue continue Value last validated connection

feed fwd. >23 mA

mV-limit value 1

feed fwd. <4 mA

continue continue is used

value Signal <3.0 ±0.2 mA and cable connection

Correction measured variable

Signal exceeds/drops below

te-input

Signal exceeded/drops below value

Check probe with error

mV input faulty

mV calibration

faulty

Basic load Stop Yes Signal <3.0 ± 0.2 mA Check probe, transducer and

Basic load Stop No Metering continues in Check probe, replace if

Fault Fault text Symbol Effect Alarm with Remarks Remedy

Measured value

Checkout time exceeded

measured value

Check mV probe

on metering on control

Basic load Stop Yes Function defeatable Check function of probe

valid values are still used operation region of the

adjustment the last

Without correct Check connection of relay,

potentiometer. Adjust the

servomotor correctly

of measured variable

replace if necessary

PI-part frozen

acknowledgement

No further fault check

–

Yes Servomotor closes Check servomotor

reset values if necessary

Function defeatable Define cause,

Yes Signal <3.8 ±0.2 mA Check probe,

Yes Pt100 Signal > 138,5 Ω Check sensor, transducer

Value last validated is used

or >23 ±0.2 mA

case of error with unsteady

measured values if necessary

or >23 ± 0.2 mA cable connection

necessary, recalibrate

acknowledgement

©1995 ProMinent Dosiertechnik GmbH · D-69123 Heidelberg

Operating Instructions DULCOMETER® D1C, Part 2/Redox/ORP

ProMinent Dosiertechnik GmbH · Im Schuhmachergewann 5-11 · D-69123 Heidelberg

Phone: [phone] · Fax: [phone]

24

Subject to modifications · Printed in Germany

[e-mail] · www.prominent.com