WILKERSON INSTRUMENT CO., INC.

MM1520 Strain Gauge (Bridge) Input Plug-In
Dual Alarm Mighty Module

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MM1520

MM1520
Strain Gauge (Bridge) Input
Plug-In
Dual Alarm
Mighty Module

$395.00

The following information must be entered to complete your order:
See "Specifications" below for Input range limits.

Power:

Input:
Zero Scale
Full Scale
Units
  Excitation
Alarms: Alarm Action
  Alarm Logic

Quantity:

 

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Specifications
 
  • Features
  • Description
  • Specifications
  • Dimensions
  • Connections
  • Provides Relay Contact Closures at Preset Strain Gauge Bridge Input
  • 0.5 mV/V to 1 V/V Input Span
  • Fail-Safe, Latching and Adjustable Deadband Available
  • Red and Green LED Alarm Status Indicators
  • Unlimited Choice of Input Ranges ( Within specified range limits )
  • Choice of Power Options
  • 10 Year Warranty

The MM1520 monitors the DC input signal from a strain gauge bridge and provides two sets of spdt, 5 A alarm relays with two independently adjustable setpoints. Each setpoint has a set of red/green LEDs to indicate alarm status. When the input is between the setpoints, the relays are normally deenergized. When the signal exceeds a particular setpoint, the relay becomes energized. To provide a “fail-safe” operation (loss of power resulting in an alarm state), select Option R. The module can be supplied as a HI/HI, HI/ LO, or LO/LO alarm (HI/LO supplied if not specified).

Standard deadband on both alarms is fixed at 0.5% of span. (Option A provides adjustable deadband of 0.5% to 100% of span.) Option D, latching alarms, 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 filters and lightning protection to reduce susceptibility to electrical noise and damage by lightning. It also provides 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
Standard fixed 0.5% of span
(Option A) 0.5% to 100% of span
(Option D) Latching. Interrupt power to reset.

RELAY CONTACTS (spdt)**
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)
2.5 A max, 75 W max, 220 VAC max, 30 VDC max 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).

Mighty Module Dimension Drawing

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
Specifications    Manual

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