• Provides a DPDT Relay Contact Closure at a Preset Thermocouple Input
• Cold Junction Compensated
• Standard Fail-Safe Operation
• Red and Green LED Alarm Status Indicators
• Adjustable Deadband
• Latching Alarm Available (MM1210)
• 5 mV Minimum Input Span
• Unlimited Choice of Input / Output Ranges ( Within specified range limits )
• Upscale Burnout Protection (Downscale Available)
• Choice of Power Options
• 10 Year Warranty

The MM1200 monitors any thermocouple input signal and trips a dpdt, 5 A relay when the input exceeds the desired level. Normal operation has the relay energized for the non-alarm condition and de-energized for an alarm condition. This provides a fail-safe alarm condition for loss of power to the module. The alarm has a set of red/ green LEDs to indicate the alarm status.

A deadband adjustment allows a deadband of 0.5% to 100% of span to be set into the module. The deadband is symmetrical about the setpoint.

With the latching option, the alarm has no deadband control. Once the limit has been reached, the alarm latches and power must be momentarily interrupted to reset the alarm.

Cold junction compensation is provided by a solid state temperature sensor embedded in the thermocouple terminal strip.

All Wilkerson products are designed with RFI filters and lightning protection to reduce susceptibility to electrical noise and damage by lightning.

Upscale burnout protection is provided as standard. In the event the thermocouple opens, the module behaves as though the input goes offscale high. Option B provides downscale burnout
protection (module behaves as though the input goes low).

TYPICAL APPLICATIONS
Heater/cooler control, HI/LO temperature alarm.

INPUT RANGE select any type thermocouple (min span 5 mV) SETPOINT 0 to 100% of span DEADBAND 0.5% to 100% of span RELAY CONTACTS (dpdt) Resistive Load 5 A max,    150 W max, 220 VAC max, 30 VDC max Inductive Load (power factor >0.4)    2.5 A max, 75 W max, 220 VAC max, 30 VDC max ACCURACY ±0.1% of span TRANSISTOR OUTPUT (Option V) relay driver (12 V coil, >220 ohms) or open-collector outputs sink 100 mA, 30 V supply max

COMMON MODE REJECTION 120 dB, DC to 60 Hz OPERATING TEMPERATURE 14°F to 140°F/–10°C to 60°C TEMPERATURE STABILITY ±(0.02% of span + 1.3 μV)/°C max POWER 115 VAC ±10%, 50/60 Hz (2.5 W max) 230 VAC ±10%, 50/60 Hz (2.5 W max) (DC Power Option) 24 VDC (limits 21-32 VDC) 12 VDC (limits 10-16 VDC) Isolation, DC power supply to input common: 10 megohms

T/C Input + T/C Input + PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8 PIN 9 PIN 10 PIN 11

T/C Terminal+ T/C Terminal - Power AC L1 or DC + No Connection Power AC L2 or DC - No Connection No Connection Relay Set 1 NO Relay Set 1 C Relay Set 1 NC Relay Set 2 NO Relay Set 2 C Relay Set 2 NC