User guide

A.18 ■ Appendix Watlow Series 97
Electromechanical Relay
• Form C contact configuration
• Minimum load current 10mA @ 5VÎ (dc)
• Rated resistive and inductive loads: 2A @ 250VÅ (ac) or
30VÎ (dc) maximum
• Electrical life 100,000 cycles at rated current
• For resistive loads only, must use RC suppression for
inductive loads
Retransmit
• Range selectable: 0-20mA, 4-20mA, 0-5VÎ (dc),
1-5VÎ (dc), 0-10VÎ (dc)
• 0 to 10VÎ (dc) voltage output into a 1,000Ω minimum load
resistance
• 0 to 20mA current output into an 800Ω maximum load
resistance
• Resolution:
dc ranges = 2.5mV nominal
mA ranges = 5µA nominal
• Calibration accuracy:
dc ranges = ±15mV
mA ranges = ±30µA
• Temperature stability 100ppm/°C
Communications
• EIA/TIA-485, EIA/TIA-232
• Opto-isolated
• Modbus
™ RTU protocol
• 1200, 2400, 4800, 9600, 19200 baud rates
• 32 maximum units can be connected (With additional 485
repeater hardware, up to 247 units may be connected)
Accuracy
• Input ranges
Type J: 32 to 1382°F or 0 to 750°C
Type K: -328 to 2282°F or -200 to1250°C
Type T: -328 to 662°F or -200 to 350°C
Type N: 32 to 2282°F or 0 to1250°C
Type E: -328 to 1470°F or -200 to 900°C
Type C(W5): 32 to 4200°F or 0 to2315°C
Type D(W3): 32 to 4200°F or 0 to2315°C
Type PTII: 32 to 2540°F or 0 to1393°C
Type R: 32 to 2642°F or 0 to1450°C
Type S: 32 to 2642°F or 0 to1450°C
Type B: 1598 to 3092°F or 870 to1700°C
DIN: -328 to 1472°F or -200 to 800°C
JIS: -328 to 1166°F or -200 to 630°C
Thermocouple Inputs
• Calibration accuracy ±0.1% of span ±1°C at standard
conditions
Exceptions:
Type T; 0.12% of span for -200°C to -50°C,
Types R and S; 0.15% of span for 0°C to 100°C
Types B; 0.24% of span for 870°C to 1700°C
• Accuracy span: 540°C/1000°F minimum
• Temperature stability: ±0.1 degree per degree change in
ambient
Specifications
(2195)
Controller
• Microprocessor-based, user selectable control modes
• Input sample period; Single input 10Hz (100 msec), dual input
5Hz (200 msec) digital filter adjustable
• Display update; 2Hz (500 msec), time filter adjustable
• Input/Output/Communication isolation
• Displayed in °C or °F
Operator Interface
• Dual 4-digit LED displays: upper 10.2 mm (0.4 in), lower 6.2
mm (0.244 in)
• Advance, Up Arrow, Down Arrow, Reset tactile keys
Standard Conditions For Specifications
• Ambient temperature 25°C/77°F ±3°C, rated line voltage, 50 to
60Hz, 0 to 90% RH non-condensing,
15 minute warm-up
Universal Input 1
Thermocouple
• Type J, K, T, N, C (W5), E, PTII, D (W3), B, R, S thermocouple
types
• >20MΩ input impedance
• Maximum 20Ω source resistance
• 30mA open detection bias
RTD
• 2- or 3-wire platinum, 100Ω
• DIN and JIS curves
• Whole or tenth degree indication
• 150µA nominal RTD excitation currrent
Input 2
Event Input
• Contact or voltage
• 20KΩ input impedance
• Voltage input: event high state 3 to 36VÎ (dc),
event low state 0 to 2VÎ (dc)
• Resistance/contact input: event high state > 23kΩ, event low
state 0 to 2kΩ
Output Types
Open Collector/Switched DC
• Open collector configuration:
Maximum voltage 42VÎ (dc)
Maximum current 200mA
Maximum “on” resistance 1.1Ω
Maximum offstate leakage current 100µA
• Switched dc configuration:
Switched dc supply voltage 22 to 28VÎ (dc)
dc supply current limited to 30mA
Solid-state Relay
• Optically isolated
• Zero cross switched
• Without contact suppression
• Minimum load current 0.5mA rms
• Maximum current 0.5A rms at 20 to 280VÅ (ac)
• Maximum offstate leakage current 10µA rms
• For resistive loads only, must use RC suppression for
inductive loads