Digi-Sense 3622571, 3622572, 3622573, 3622574 Instruction Manual

Power

Inlet

Grid

Support

Load
Fuse

(x2)

Load

Outlet (x2)

Sensor

Input (x2)

ON/OFF

Main

Power

Switch

Digital

Control

Module (x2)

ON/OFF

Alarm

Switch

Alarm

Operation Manual

Instruction Notes for 3622571, 3622572, 3622573, 3622574

Figure 1 Figure 2

General Description

This control is ideal for 2 independent temperature processes. This space saving design combines 2 controls into one
package to maximize bench space. This control displays both the setpoint and process temperature and uses the most
modern control technology for the best temperature stability. The Auto-tune feature minimizes setpoint overshoot and
learns your process. Changing your setpoint is easily done with the interface keys. Several input types are available. This
unit comes with an audible alarm function, 6’ detachable power cord and grid support bracket, which is ideal for fume
hood mounting to maximize bench space. This family of control accepts a type "J", “K”, “T” thermocouples or RTD input
depending on the model ordered.

The control automatically sets the PID parameters through a "learning" sequence in the auto-tuning mode. PID
parameters include proportional band, reset/integral and rate/derivative. User-friendly features include automatic LED
indicators to aid in monitoring and setup, as well as dual LED displays for process temperature and set point indication.
This control automatically stores all information in a non-volatile memory.

Control Features

1. On/Off power switch.

2. On/Off alarm switch.

3. 15-amp output.

4. Circuit protection (fuses)

5. Audible alarm.

3/10 1 Rev.0

Up/Down keys:

Adjust the setpoint in

the lower display

Upper Display:

Indicates the

process value.

Advance Key:

Advances through

parameter prompts.

Infinity key:
Clears and silences
alarms, press to back up
one level, or press and
hold for two seconds to
return to the Operations
Menu.

Lower Display:

Indicates the

setpoint value.

Figure 3. Digital Control Module Detail

How to Setup and Operate each Channel

First, connect the heater load and the sensor to the load and sensor receptacles on the front panel. Next, plug the control
line cord into an appropriate 3-wire grounded power receptacle. Push the power switch to the "ON" position. Wait five
seconds for the control unit to energize.

The control is shipped from the factory with the display reading in degrees C. If a display in degrees F is desirable, press
the UP/DOWN arrow keys simultaneously for three seconds to access the Setup Page. Press the Advance key until the
Celsius_Fahrenheit parameter [C-F] is shown in the lower display. Press the UP arrow key to change from C to F.

After changing the display, press the Infinity key to display the set point temperature and the process temperature
(temperature at the sensor).

To begin the heating application, use the Up/Down arrow keys to enter the desired set point temperature. This is shown
in the lower display. Press the Advance key to cycle through the Operations Page until the auto-tuning parameter [Aut] is
shown in the lower display. Auto-tuning is recommended in most applications. Auto-tuning allows the control to set the
parameters without those parameters being input by the user. It also minimizes the amount of temperature overshoot of
the set point and decreases the time required for the process to stabilize.

After setting the auto-tuning parameter [Aut] to ON, press the Infinity key to display the set point and process
temperatures. While the control is in the auto-tuning mode, the lower display alternately flashes the set point and the "Aut"
prompt. When tuning is complete, the lower display indicates only the set point.

3/10 2 Rev.0

Range Type J:

-200°C to 1200°C

Range Type K:

-200°C to 1370°C

Range Type T:

-200°C to 400°C

Range Type RTD:

-200°C to 800°C

The auto-tuning function can be aborted by setting auto-tuning [Aut] to OFF or switching off power to the control.
It is recommended that auto-tuning be used each time a process is being run. If the process is being duplicated, the

parameters learned in the initial setup are stored in the memory of the control and no repeat of auto-tuning is required.
Auto-tuning feature allows quick and simple automatic control for the majority of heating applications. This control is

capable of performing other control functions and has a variety of features.

Control Sensor

Proper placement of the sensor can eliminate many problems in the total system. The probe should be placed so that it
can detect any temperature change with little thermal lag. In a process that requires fairly constant heat output, the probe
should be close to the heater. In processes where heat demand is variable, the probe should be close to the work area.
Some experimenting with probe location can be tried to provide optimum results.

Specifications

Control Mode

- Microprocessor-based, single input, single output.

- PID parameters
Proportional band: 1 to 999o F

Reset: 0.00 to 99.99 repeats per minute.
Integral: 0.00 to 99.99 minutes per repeat.
Rate or Derivative: 0.00 to 9.99 minutes.

Operator Interface

- Advance, Infinity, Up and Down keys and ON/OFF switch.

- Dual, four digit LED displays.

- Thermocouple receptacle or (RTD) and 3-wire load receptacle.

Input

- Type J, K , T thermocouple or (RTD): input grounded or ungrounded.

- Automatic cold junction compensation and break protection for sensor.

- Degrees F or degrees C display; user selectable (preset for degrees C)

Primary Output (Heating or Cooling)

- 7.5 Amp per channel, 120 Volts.

Accuracy

- Calibration accuracy: 0.1% of span.

- Temperature stability: 0.2 oF / oF rise in ambient maximum.

- Voltage stability: 0.01% of span / % of rated line voltage.

Power

- 50/60 Hz 5%

- Data retention upon power failure via nonvolatile memory.

Operating Environment

- 32 to 149 oF / 0 to 65 oC; 0 to 90% RH, non-condensing.

3/10 3 Rev.0

Setup Menu

3/10 4 Rev.0

Factory set at 10

3/10 5 Rev.0

3/10 6 Rev.0

-1,999.000 to 9,999.000F our units

-1,128.000 to 5,537.000 C
Units, 300.0 F or 150.0 C Change this value for upper alarm

Alarm: To change the upper
alarm setting press the
Advance key until Ahi
appears and then use the
up/down arrow keys. When
done press the infinity key.
Once an alarm conditions
happens the alarm will sound
and remain on until the
process value drops below
the established limit. At any
time you may turn off the
audible alarm by turning off
the alarm switch. An alarm
condition will also appear on
the display.

Operations Menu: Used mainly for Autotune and Alarm setup

How to Tune and Operate
Manual operation provides direct (time proportioned % time) control from -100% to 100%. A negative value is allowed
only when Ot 1=Cool. Automatic operation provides sensory feedback ON/OFF or PID control. When the operation
transfers from automatic to manual operation, the power level from automatic operation is retained and restored to the
previous set point.

The % LED indicates manual operation. The LED is on when in Manual operation and off when in AUTO operation.
When the LED is flashing, press the Infinity key again within 5 seconds to complete the change in operation. It the
sensor is open and LOC=0, 1 or 2, the control switches to Manual operation if the output was stable before the break
occurred.

3/10 7 Rev.0

Tuning-Automatic

Auto-tuning: This control can automatically tune the PID parameters to fit the characteristics of your particular thermal
system.

Auto-tune can only be used when Output 1 is hEAt. Once the auto-tune sequence has begun, the lower display flashes
between AUt and the set point. The displayed set point remains unchanged.

Once the control finished "learning" the system, it returns to standard PID control with the values automatically set. Auto­tuning is complete within 80 minutes. Any change of the set point, while in auto-tune, re-initiates the auto-tune procedure.

In order for the control to successfully complete auto-tune, the process must cross set point four times within 80 minutes
after auto-tune has started. If this does not happen within the 80 minute time limit, Pb1 remains at 0 and the control
functions in an ON/OFF mode.

To start auto-tuning:

1. Press the Advance key until the Aut prompt appears in the lower display.

2. Change the parameter to On.

3. Press the Infinity key to display the set point and sensor temperatures. While the control is in the tuning mode,
the lower display alternately displays set point and the "Aut" prompt.

4. When tuning is complete, the lower display indicates setpoint only and Aut reverts to OFF. The control installs
appropriate PID tuning parameters and saves them in the non-volatile memory.

*To abort auto-tuning, the operator must reset Aut to OFF. Auto-tuning may also be aborted by cycling power off and on.
In all cases, aborting auto-tuning restores all original values.

Error Code Definitions and Actions:

Er.In - An open or reversed polarity sensor is the most likely cause. Check the sensor; if the connection is good and
functions properly, call the factory. Make sure the input parameter [SEn] is set to the correct type thermocouple.

Er.Ab – Ambient temperature may be too hot or too cold. Make sure that the temperature surrounding the control is –18 to
65C.

Er.CS – Checksum Error. Settings may have changed unexpectedly. Press the Infinity key to clear the error. Verify
settings. If error message persists, contact the factory.

To clear a corrected error, cycle power to the control.

3/10 8 Rev.0

GLOSSARY
Automatic prompts: Data entry points where a microprocessor-based control "prompts" or asks the operator for

information input.
Auto-tune: Automatically tunes the parameters to fit the characteristics of your particular thermal system.
Cold junction compensation: Electronic means to compensate for the effect temperature at the cold junction.
Cycle time: The time necessary to complete a full On-through-Off period in a time proportioning control system.
Derivative/Rate: Anticipatory action that senses the rate of change of the process, and compensates to minimize

overshoot and undershoot.
Default parameters: The parameters (programmed instructions) permanently stored in microprocessor software to

provide the data base.
Droop: Difference in temperature between set point and stabilized process temperature.
Hysteresis: In On/Off control, the temperature change necessary to change the output from On to full Off.
Input (sensor): Process variable information being supplied to the instrument.
Integral/Reset: Control action that automatically eliminates offset, or "droop", between set point and actual process

temperature.
Offset: Adjustment to actual input temperature and to the temperature valves the control uses for display and control.
ON/OFF control: Control of temperature about a set point by turning the output full On below set point and full Off above

set point.
Output: Action in response to difference between set point and process variable.
Overshoot: Condition where temperature exceeds steeping due to initial power up or process changes.
Parameter: a physical property whose value determines the response of a electronic control to given inputs.
PID: Proportioning control with auto-reset and rate.
Process variable: Thermal system element to be regulated, such as time, temperature, relative humidity, etc.
Proportional band: Span of temperature about the set point where time proportional control action takes place.
Set point: Intended value of the process variable.
Thermal system: A regulated environment consisting of a heat source, heat transfer medium, sensing device and a

process variable control.
Thermocouple: Temperature sensing device that is constructed of two dissimilar metals wherein a measurable,

predicative voltage is generated corresponding to temperature.
Thermocouple break protection: Fail-safe operation that assures output shutdown upon an open thermocouple condition.
Time Proportioning Control: Action which varies the amount of ON and OFF time when "close" to the set point (within the

proportional band). This variance is proportional to the difference between the set point and the actual process
temperature.

3/10 9 Rev.0

Digi-Sense
625 East Bunker Court, MS 18
Vernon Hills, Illinois 60061-1844, U.S.A
Phone: [phone] Fax: [phone]
( 800) 323-4340

Maintenance

Simple preventative maintenance steps include keeping the controller clean. Protect it from overload, excessive dirt, oil
and corrosion.

Warranty

Digi-Sense, for itself does hereby offer a warranty for products from the date of receipt by the user, under normal and
proper usage, against defects in workmanship and materials for 12 months, and will repair or replace any defective
part(s) without charge when same is shipped Prepaid to Digi-Sense from which the product was originally purchased.

Should the nature of any defect require that the product, or any constituent portion thereof, be returned to Digi-Sense,
Vernon Hill, Illinois, prepaid for service, a condition precedent to any return shall be the procurement of authorization from
Digi-Sense assigning a Return Goods Number to the product or part requiring service.

Parts and accessories manufactured by others are warranted only to the extent of the regular warranty of the
manufacturer or supplier of such materials and only insofar as Digi-Sense is able to transfer the benefits of warranty
coverage, if any, to the user. Any adequately warranted defective part or accessory manufactured or supplied by others
may be exchanged through Digi-Sense for a replacement part is shipped prepaid and received at Digi-Sense within 30
days from the date any replacement part is obtained by the user.

This warranty supersedes and is given in lieu of all implied warranties, and is void if the user causes damages from
improper usage of product under normal operating conditions.

12 MONTHS LIMITED WARRANTY ON ALL PARTS AND LABOR IS GIVEN BY DIGI-SENSE.
CATALOG NUMBER 3622571, 3622572, 3622763, 3622574
SERIAL NUMBER _________

DATE OF PURCHASE _______________

3/10 10 Rev.0