WILKERSON INSTRUMENT CO., INC.

MM1820 Potentiometer Position Input Plug-In
Dual Alarm Mighty Module

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MM1820

MM1820
Potentiometer Position 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:

Alarms: Alarm Action
  Alarm Logic

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Specifications
 
  • Features
  • Description
  • Specifications
  • Dimensions
  • Connections
  • Provides Relay Contact Closures at a Present Potentiometer Position Input
  • Potentiometer Values from 100 ohms to 100 kilohms
  • Fail-Safe, Latching and Adjustable Deadband Available
  • Red and Green LED Alarm Status Indicators
  • Unlimited* Choice of Input Ranges
  • Choice of Power Options
  • 10 Year Warranty

The MM1820 monitors the slide position of a potentiometer 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 signal exceeds a particular setpoint, the relay becomes energized. To provide a “fail-safe” operation (loss of power resulting in 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. They also utilize a stable 1 V power supply to excite the potentiometer. Any value potentiometer from 100 ohms to 100 kilohms can be used.

TYPICAL APPLICATIONS
Tank level, valve or actuator position control, monitoring or warning.

INPUT POTENTIOMETER RESISTANCE
any value from 100 ohms to 100 kilohms

SPAN ADJUSTMENT
70% to 100% of pot rotation

OFFSET ADJUSTMENT
0 to 25% of pot rotation

INPUT IMPEDANCE
>10 megohms

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, 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
1 V, 10 mA max load

RESPONSE TIME
20 ms typical

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

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 +
Potentiometer Input FS
Power AC L2 or DC -
Potentiometer Input Zero
Potentiometer Input Wiper
Relay Set 1 NO
Relay Set 1 C
Relay Set 1 NC
Relay Set 2 NO
Relay Set 2 C
Relay Set 2 NC
Specifications    Manual

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