Watlow Series L Temperature Limit Manual do Utilizador descarregar pdf (Página 15)

Watlow Series L

•

Appendix

Controller

• Microprocessor based, limit controller.

• Nominal switching hysteresis, typically 1.7°C (3°F)

• High or low limit, factory selectable.

• Latching output requires manual reset upon over

or under temperature condition.

• Manual or automatic reset on power loss, factory

selectable.

• Internal front panel or external customer supplied

momentary reset switch.

• Input filter time: 1 second.

Operator Interface (model dependent)

• Four digit , 7 segment LED displays, .28" high.

• °F or °C indicator LED.

• ALARM indicator LED.

• Continuous turn, velocity sensitive rotary encoder

for limit set point adjustment.

• Front panel SET/RESET key on variable set point

models.

• No operator interface on fixed set point models.

Standard Conditions For Specifications

• Rated line voltage, 50 to 60Hz, 0 to 90% RH non-

condensing, 15-minute warm-up.

Calibration ambient range: 25°C (77°F) ±3°C

Sensor Input

Thermocouple

• Grounded or ungrounded.

• Type E, J, K, T thermocouple types.

• >10 MΩ input impedance.

• 250 nV input referenced error per 1 Ω source resis-

tance.

RTD

• 2-wire platinum, 100 Ω.

• DIN curve (.00385 curve).

• 125 μA nominal RTD excitation current.

Input Accuracy Span Range

Thermocouple Input

Type E -200 to 800°C or -328 to 1,470°F

Type J: 0 to 750°C or 32 to 1,382°F

Type K: -200 to 1,250°C or -328 to 2,282°F

Type T: -200 to 350°C or -328 to 662°F

RTD (DIN): -200 to 800°C or -328 to 1,472°F

• Calibration accuracy: ±1% of input accuracy span,

±1° at standard conditions and actual calibration

ambient.

Exception: Type T, ±2.4% of input accuracy span

for -200 to 0°C (-328 to 32°F)

• Temperature stability: ±0.3 degree per degree

change in ambient.

RTD Input

• Calibration accuracy: ±1% of input accuracy span

±1° at standard conditions and actual calibration

ambient.

• Temperature stability: ±0.2 degree per degree

change in ambient

Allowable Operating Ranges

Type E -200 to 800°C or -328 to 1,470°F

Type J: -210 to 1,038°C or -346 to 1,900°F

Type K: -270 to 1,370°C or -454 to 2,500°F

Type T: -270 to 400°C or -454 to 750°F

RTD (DIN): -200 to 800°C or -328 to 1,472°F

External Reset Switch

• Momentary, dry contact closure. See wiring section.

Output Types

Electromechanical Relay, Form C

• Minimum load current: 100 mA.

• 8 A @ 240VÅ (ac) or 30VÎ (dc) maximum, resistive.

• 250 VA pilot duty, 120/240VÅ (ac) maximum, in-

ductive.

• Use RC suppression for inductive loads.

• Electrical life 100,000 cycles at rated current.

Agency Approvals

Series LF (potted version only)

• UL 991 recognized temperature limit for food ser-

vice industry.

•

RoHS Directive (2002-95-EC)

Series LV and Series LF (including potted version)

• UL 873 recognized temperature regulator. File

#E43684.

• UL 197 reviewed for use in food service appliances.

• ANSI Z21.23 Gas appliance thermostat approval.

• CSA C22.2#24 approved temperature control. File

#30586.

• FM Class 3545 temperature limit switches. File

#3017239.

• NEMA 4X/IP65 on panel-mount versions with tac-

tile keys for set point adjustment.

• W.E.E.E.; CE - see Declaration of Conformity.

•

RoHS Directive (2002-95-EC)

Terminals

• 6.4 mm (0.25 in) quick connect, push-on termi-

nals. See order options. Refer to Wiring section for

crimp-on terminal recommendations.

• Removable screw clamp style terminal blocks. See

order options.

•

Wire gauge 0.1 to 4 mm

(30 to 12 AWG). Strip

length, 8 mm (0.30 in).

•

Torque

0.8 Nm (7 in-lb) maximum.

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