manufacturer :       PCT

model :                   90

annotation :           Dokumente engl.

The Model 90 is a Microprocessor based controller/timer. It monitors temperature utilizing a Type J thermocouple sensor and controls bath temperature with a standard three mode (PID) control scheine, with anti-reset windup. Numerous status and alarm functions are incorporated to monitor various system parameters. Additionally, a down-count/up-count programmable timer, with cumulative over timer and pre-warn is integrated into the system. A pilot duty photoisolated triac output is used to drive a remote heater power relay. An optional power pack may be furnished that will provide the load carrying solid state switching an board. Additionally, an optional Auxiliary Relay may be provided. This may be utilized for either Timer or DI output.

An independent high Limit circuit is provided. It is powered by an isolation transformer that draws power from the primary side of the master relay. The sensor is a Type J thermocouple. This circuit shuts off the internal master relay should an over temperature condition occur.

Twelve discrete LEDs are utilized to indicate system and display status as well as annunciate various alarms. A 12 key membrane switch is incorporated in the facepanel to allow for user setup and adjustment of the system, plus full timer control.

Two numeric displays are utilized to allow the viewing of both the process temperature and the timer simultaneously. Additionally, each of the displays has multiple diagnostic and setup functions that may be activated by the keyboard or by the Microprocessor during various setup and alarm conditions.

The microprocessor section consists of two circuit boards, one for display and the other for control. The control board contains two transformers and provides the isolated DC supplies (+5 and +12 volts) necessary to run the system. In addition, it contains an instrumentation amplifier, A/D converter, EEPROM memory and the microprocessor. The display board contains all of the seven segment and LED displays as well as the audio transducer.

Technical Data

RANGE                              0.0 - 199.9 Degrees C.

(Temperature)

RESOLUTION                   0.1 Degrees C.

(Temperature)

NOISE REJECTION          NMR - 60 db @ 60 HZ

                                          CMR -120 db @ 60 HZ

RANGE (Time)                   0:00 - 99:59 Min :Sec

RESOLUTION (Time)        1 Sec.

MEASURING TIME             4 Conversions/Sec

DISPLAY                            Eight, 0.56 Inch High, Seven Segment,

                                          LED Uniplanar numerals. Twelve Discrete

                                          LEDs (Red, Green, Amber).

ANNUNCIATOR                 Audio Tone, - 2500 HZ

SETUP MEMORY              EEPROM, All Parameters

MEMORY RETENTION     10 Years w/o Power

SENSOR                           Standard - Type J Thermocouple,

                                          Cold Junction Compensation,

                                          Up Scale Break Protection.

CONTROL                         PID with Anti-Reset Windup.

ADJUSTMENT                   Cycle Rate: 1 - 19 Sec.

                                          Proportional Band: .1 - 19.9 Deg. C

                                          Reset (Integral):    .1 - 19.9 Sec .
Rate (Derivative): .1 - 19.9 Sec.

                                          Calibration Offset: ± 9.9 Deg. C

OPERATING RANGE        0 to 50 Degrees C

STORAGE RANGE           -40 to 60 Degrees C

CONSTRUCTION              Enclosure - Kydex.

                                          Face - Lexan, Back Printed

SIZE                                   7 x 6 x 5.25 inches (HxWxD)

                                          178 x 152 x 133mm

WEIGHT                             ≤ 4 Lbs. (1.8 kg)

CONNECTION                   Rear, Screw-Type, 3/8 Inch Centers;

                                          T/C - Miniature, Type J, Jack.

OUTPUT                            SSR, Optically isolated, zero cros s,

                                          20 Amp, 208 VAC.

POWER                             11 VA, 208 VAC ±10%, 50/60 HZ