Watlow SD31 Data sheet

SERIES SD31

Reliable Control
and Application
Flexibility in a
Compact Package

Features and Benefits

Accurate PID control with auto-tune

• Improves process yield

INFOSENSE™ sensor technology

• Thermal sensing technology improves accuracy by a

minimum of 50 percent

Optional countdown timer

• Enhances process control capability

User defined menu system

• Simplifies control operation

• Reduces operator errors

Serial communications

• Connectivity with WATVIEW (Human Machine Interface)

HMI software

Ramp to set point

• Controls temperature rise

Variable burst fire

• Provides tighter control

• Prolongs heater life

Agency approvals

• UL®‚ C-uL®, CE NEMA 4X/IP65, CSA and NSF

UL®and C-uL®are registered trademarks of Underwriter’s

atories, Inc.

Labor

The SERIES SD family of PID temperature controllers utilizes
today’s advanced micro-electronics technology to provide the
value, benefits and accuracy you’ve come to expect from
Watlow. The SERIES SD31 offers improved accuracy of 0.1
percent of span as well as a faster sampling rate of 6.5Hz in

1

⁄32 DIN package.

a

An optional full featured countdown timer operates in a
choice of delay-on, delay-off, signal-on or signal-off modes.
This timer supports set point tracking during countdown for
both heat and cool process variables.

The SERIES SD31 controller delivers many flexible, user­friendly options. Easily choose factory or user defaults and
display either process or set point values. Process inputs are
scalable and invertible from the front panel. Other features
include Variable Burst Fire and flexible Outputs, that users
can select as On-Off, Heat/Cool or as Process or Deviation
Alarms. Users can also select between 11 different Thermo­couples, a 100 Ohm RTD, a 0 to 20mA or 0 to 10V process
input - all from the front panel - which eliminates the need for
dip-switches.

With optional EIA-485 communications, you can configure,
monitor and data log with such optional software products
like WATVIEW.

Your Authorized Watlow Distributor Is:

1241 Bundy Boulevar
Winona, Minnesota 55987-5580 USA
Phone: [phone]
Fax: [phone]
Internet: www.watlow.com
e-mail: [e-mail]

d

WIN-SD31-1004

To be automatically connected to the nearest North American Technical and Sales Office call:

1-800-WATLOW2

International Technical and Sales Offices: Australia, [phone] • China, [phone] • France, [phone] •

Germany, [phone] • Italy, [phone] • Japan, [phone] • Korea, [phone] • Malaysia, [phone] •
Mexico, [phone] • Singapore, [phone] • Spain, [phone] • Sweden, [phone] • Taiwan, [phone] •
Sweden, [phone] • United Kingdom, [phone]

2004 Watlow Electric Manufacturing Company Printed in the USA on Recycled Paper, 15 Percent Postconsumer Waste

©

Specifications

Line Voltage/Power

• 100 to 240VÅ(ac), +10/-15 percent; (85-264V~[ac])
50/60Hz, ±5 percent
24V

ı(ac/dc), +10/-15 percent;

•

• 10VA maximum power consumption

• Data retention upon power failure via nonvolatile memory

Environment

• -18 to 65°C (0 to 149°F) operating temperature

• -40 to 85°C (-40 to 185°F) storage temperature

• 0 to 90 percent RH, non-condensing

Accuracy

• Calibration accuracy and sensor conformity: ±0.1 percent
of span,

±1°C @ the calibrated ambient temperature and

rated line voltage

• Calibration ambient temperature = 25°C ±3°C (77°F ±5°F)
Accuracy span: 540°C (1000°F) minimum

•

• Temperature stability: ±0.1°C/°C (±0.2°F/°F) rise in
ambient maximum

Agency Approvals

•UL®3121, C-UL®‚ CSA, CE, IP65/NEMA 4X

• NSF for Type J, K, T and E thermocouples

Controller

• Microprocessor based user-selectable control modes

• Single universal input, up to three outputs

• Control sampling rates: Input = 6.5Hz, Display = 10Hz,
Outputs = 6.5Hz

Operator Interface

• Single 4 digit, 7 segment LED displays

• “Set” infinity and up down keys

• Isolated EIA-485 Modbus™ serial communications, 9600,

19.2K or 38.4K baud rates

Wiring Termination -Touch Safe Terminals

• Input power and control outputs 12 to 22 AWG

• Sensor inputs and process outputs 20 to 28 AWG

Universal Input

• Thermocouple, grounded or ungrounded sensors

• RTD 2- or 3-wire, platinum, 100
DIN-curve (0.00385 

/ /°C)

• Process, 0-20mA @ 100
impedance; Scalable

• Inverse scaling

• >20M

• Maximum of 20

Allo

input impedance

source resistance

wable Operating Range

Type J: 0 to 815°C or 32 to 1500°F
Type K: -200 to 1370°C or -328 to 2500°F

400°C or -328 to 750°F

to

-200

:

T

ype

T

ype N: 0 to 1300°C or 32 to 2372°F

T
Type E: -200 to 800°C or -328 to 1470°F

ype C:

T

0 to 2315°C or 32 to 4200°F

Type D: 0 to 2315°C or 32 to 4200°F

to 1395°C or 32 to 2543°F

ype PTII:

T

0
Type R: 0 to 1760°C or 32 to 3200°F
Type S: 0 to 1760°C or 32 to 3200°F
Type B: 0 to 1816°C or 32 to 3300°F

TD (DIN):

R

-200

800

to

Process: -1999 to 9999 units

Modbus™ is a trademark of Schneider Automation, Inc.

50/60Hz, ±5 percent

@ 0°C calibration to

, or 0-10VÎ(dc) @ 20k input

°C or -328 to 1472°F

ol Outputs

Contr
Outputs 1 or 2

• User selectable for heat/cool as on-off, P, PI, PD, PID or
Alarm action

• Electromechanical relay. Form A, rated 2A @ 120V
2A @ 240V

Å(ac) or 2A @ 30VÎ(dc)

Å(ac),

• Switched dc non-isolated minimum turn on voltage of

Î(dc) into a minimum 500 load with a maximum on

6V
voltage of not greater than 12V

um switched dc power supply current available for

Maxim
up to tw

o outputs is 60mA

• Solid-state relay, Form A, 0.5A @ 24V
264V

Å(ac) maximum, opto-isolated, without contact

Î(dc) into an infinite load.

Å(ac) minimum,

suppression

• Process output (Non Isolated)
User-selectable 0-10V
1K

minimum, 0-20mA, 4-20mA @ 800 maximum

• Open collector 42V

Î(dc), 0-5VÎ(dc), 1-5VÎ(dc) @

Î(dc) @ 250mA maximum

• EIA-485 serial communications with Modbus™ protocol
(output 2 only)

• 9600, 19.2K or 38.4 baud rates

Communications

• Modbus™ EIA-485

• WATVIEW

Dimensions

•1⁄32 DIN size

• 97.8 mm (3.85 in.) behind panel maximum

• Width 52.6 mm (2.07 in.)

• Height 29.7 mm (1.17 in.)

Ordering Information

To order, complete the model number on the right with the
information below.

S D 3 1 - _ _ _ A - A _ _ _

Single channel control with universal
input and single display operator interface

Power Supply

H = 100 to 240Vı(ac/dc)
L = 24 to 28V

Output 1

= Switched dc/Open collector

C
K = SSR, Form A, 0.5A
F = Universal process
J = Mechanical relay, Form A, 2A

Output 2

= None

A
C = Switched dc/Open collector

SSR, F

=

K

= Mechanical relay, Form A, 2A

J
U = EIA-484 Modbus™ communications

Control Options

A = Standard controller
T = Standard controller with timer

Display Colors and Custom Options

0R = Red display

Green displa

=

0G

ı(ac/dc)

m A, 0.5A

or

y