User guide

Watlow Series SD Limit ■ 50 ■ Appendix
Electromechanical Relay, Form A
• Minimum load current: 10 mA
• Rated resistive: 2 A @ 240VÅ (ac) or 30VÎ (dc) maximum
• Electrical life 100,000 cycles at rated current
• For resistive loads only, must use RC suppression for inductive
loads
• 125 VA pilot duty, 120/240VÅ (ac)
Electromechanical Relay, Form C
• Minimum load current: 10 mA
• Rated resistive: 5 A @ 240VÅ (ac) or 30VÎ (dc) maximum
• Electrical life 100,000 cycles at rated current
• For resistive loads only, must use RC suppression for inductive
loads
• 125 VA pilot duty, 120/240VÅ (ac)
Process
• Range selectable: 0 to 20 mA, 4 to 20 mA, 0 to 5VÎ (dc), 1 to
5VÎ (dc), 0 to 10VÎ (dc)
• Reverse or direct acting
• 0 to 10VÎ (dc) voltage output into 1,000 Ω minimum load resist-
ance
• 0 to 20 mA current output into 800 Ω maximum load resistance
• Resolution:
dc ranges: 2.5 mV nominal
mA ranges: 5 µA nominal
• Calibration accuracy:
dc ranges: ±15 mV
mA ranges: ±30 µA
• Temperature stability: 100 ppm/°C
Communications
EIA/TIA-485
• Isolated
• Modbus™ RTU protocol
• 9600, 19200 and 38400 baud rates
• A maximum of 32 units can be connected (with additional 485
repeater hardware, up to 247 units may be connected)
• Sampling rate: 20 Hz
Modbus™ is a trademark of AEG Schneider Automation.
IrDA
• Modbus™ RTU via IRCOMM over IrDA
• Sampling rate: 20 Hz
Agency Approvals
• Factory Mutual Class 3545, Temperature Limit Switches. File
#3014848.
• UL Listed Process Control UL3121
®
(UL 61010C-1), c-UL, CE,
IP65 (NEMA 4X), NEMA 12. File # E185611.
UL
®
is a registered trademark of the Underwriter’s Laborato-
ries, Inc.
• CSA C22.2#24 Temperature Indicating and Regulating Equip-
ment. File LR30586.
• NSF2 (National Sanitation Foundation) for calibration accuracy
with J, K, E, T, or RTD sensors. File 49660-0002-0001
Terminals
• Touch-safe
• Input power and control outputs: 12 to 22 AWG, 6 mm (0.25 in)
strip length
• Sensor inputs and process outputs: 20 to 28 AWG, 8 mm (0.30 in)
strip length
• Torque: terminal blocks 1 to 6 (SD _ _ - _ [C, K or J] _ _ - _ _ _ _)
and 1 to 4 (SD _ _ - _ F _ _ - _ _ _ _ ) are 0.8. Nm (7 in-lb);
terminal blocks 12, 13, 14 are 0.9 Nm (8 in-lb).
• Solid or tinned wire recommended.
Power
• 100 to 240VÅ (ac) +10%; -15%; 50/60 Hz, ±5%
• 24V‡ (ac/dc) +10%; -15%; 50/60 Hz, ±5%; Class 2 power source
is required for low-voltage model.
• 10VA maximum power consumption
• Data retention upon power failure via nonvolatile memory
Operating Environment
• -18 to 65°C (0 to 149°F)
• 0 to 90% RH, non-condensing
• Storage temperature: -40 to 85°C (-40 to 185°F)
Dimensions
Functionality Matrix
Note: These specifications are subject to change without prior
notice.
DIN Size
Behind
Panel
(max.)
Width Height
1/32
97.8 mm
(3.85 in)
52.6 mm
(2.07 in)
29.7 mm
(1.17 in)
1/16
97.8 mm
(3.85 in)
52.1 mm
(2.05 in)
52.1 mm
(2.05 in)
1/8 Vertical
97.8 mm
(3.85 in)
52.8 mm
(2.08 in)
99.8 mm
(3.93 in)
1/8
Horizontal
97.8 mm
(3.85 in)
99.8 mm
(3.93 in)
52.8 mm
(2.08 in)
1/4
101.1 mm
(3.98 in)
99.8 mm
(3.93 in)
99.8 mm
(3.93 in)
Universal
Input
Limit Alarm Process 485 Comm
Input 1
Output 1
Output 2
Output 3