• Provides a DPDT Relay Contact Closure at a Preset Strain Gauge (Bridge) Input
• 0.5 mV/V to 1 V/V Input Span
• Standard Fail-Safe Operation
• Red and Green LED Alarm Status Indicators
• Unlimited Choice of Input / Output Ranges ( Within specified range limits )
• Choice of Power Options
• 10 Year Warranty

The MM1500 monitors the DC input signal from a strain gauge bridge 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 deenergized 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 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 to the module must be momentarily interrupted to reset the alarm.

All Wilkerson products are designed with RFI filter and lightning protection to reduce susceptibility to electrical noise and damage by lightning. They also provide a well regulated excitation voltage for the strain gauge and a high quality differential preamplifier to condition the low level output from the bridge.

TYPICAL APPLICATIONS

Weight and pressure control, monitoring or warning.

INPUT SPAN 0.5 mV/V to 1 V/V INPUT IMPEDANCE 200 kilohms 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 TRANSISTOR OUTPUT (Option V) relay driver (12 V coil > 220 ohms) or open-collector outputs sink 100 mA, 30 V supply max EXCITATION adjustable 4 V to 12 V, 40 mA max load EXCITATION STABILITY ±0.005%/°C

RESPONSE TIME <500 ms ACCURACY ±0.1% of span 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/°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 ** Due to pins available, only one set of contacts are available for relay set #2. Specify NO (Normally Open) or NC (Normally Closed).

PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8 PIN 9 PIN 10 PIN 11

Power AC L1 or DC + Relay Set 2 NO or NC Power AC L2 or DC - Input + Input - Relay Set 2 C Excitation + Excitation - Relay Set 1 NO Relay Set 1 C Relay Set 1 NC