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WATLOW Series 988LF User’s Manual i

Introduction

Introduction To The Watlow

Series 988LF Controllers

Figure Int.1 -

The Series 988LF

Features.

Welcome to the Watlow Series 988LF, a dual output, single input, micro-

processor-based, 1/8 DIN, auto-tuning temperature control, featuring

automatic/manual capability with bumpless transfer. In the Auto mode,

the control has closed loop control with sensory feedback, while the

Manual mode has open loop control with user defined output power level.

The 988LF accepts a wide range of thermocouple sensors, along with RTD,

and process inputs. The primary output is Heating or Cooling, while the

secondary output can be Heating, Cooling, or Alarm.

With the Series 988LF, you can select either PID or ON/OFF for output 1

or Output 2. You may input a complete set of PID parameters for both

outputs, or select automatic tuning for both heat and cool from the front

panel. This includes proportional band, reset, rate, and cycle time. By

setting either output’s proportional band to zero, the Series 988LF

becomes a simple ON/OFF control with a 3°F or 1.7°C switching differen-

tial, 0.3°F or 0.17°C for 0.1° RTD.

Operator-friendly features include automatic LED indicators to aid in

monitoring and setup, as well as a calibration offset at the front panel.

The Watlow Series 988LF automatically stores all information in a non-

volatile memory.

PROCESS

L1 L2

DEV

% OUT

DISPLAY

SERIES 988LF

MODE

AUTO

MAN

Output 1

Control

Heat/Cool

Output 2

Control

Heat/Cool

Alarm

Input 1

Sensor Input

Input 2

Remote Set

Point Option

Auto-Tune

Heat/Cool

Process Deviation

from Set Point

Percent Power

1 2 3 4 5 6 7 8 ... 63 64

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