Watlow Series L Temperature Limit - Manual (Page 15)

Wa t l ow S e r i e s L • 13 • A p p e n d i x
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 @ 240V
Å (ac) or 30V Î (dc) maximum, resistive.
• 250 VA pilot duty, 120/240V Å (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 2 (30 to 12 AWG). Strip
length, 8 mm (0.30 in).
• Torque: 0.8 Nm (7 in-lb) maximum.
Specifi cations