MMII-PD-1-2-120 Moore Industries Millimar II Process Display & Alarm Module, 120VAC Powered Panel Meter

Description

Product Overview

The MMII-PD-1-2-120 is a Moore Industries Millimar II (MMII) series process display and alarm unit, designed to accept standard analog process signals and provide local digital readout plus relay alarm outputs. This model is powered by 120VAC supply, with configurable input ranges and dual alarm relays. It receives 4–20mA or 0–10V signals from field transmitters for pressure, temperature, level and flow indication. Widely used in refineries, chemical plants, power stations and water treatment facilities for local panel indication, independent high/low alarm interlock.

Technical Specifications

Key Features

1. 1/4 DIN panel mount digital process indicator, accepts industry standard 4–20mA and voltage analog signals from field transmitters.
2. Dual independent programmable alarm relays, configurable as high, low, deviation alarms for local alarm or hardwired interlock.
3. High precision 4-digit LED display, clear readout for operators on-site, adjustable decimal point and engineering unit scaling.
4. Front keypad calibration, zero / span adjustment without opening the instrument enclosure.
5. Rugged industrial design suitable for continuous operation in factory and process plant control panels.
6. Isolation between analog input, alarm relays and AC power to reduce ground loop noise interference.
7. 120VAC power variant, ideal for standard North American control panel power distribution.
8. Compact form factor, easy retrofit replacement for legacy panel meters in existing process systems.

Installation Notes

• Cut 1/4 DIN panel cutout and mount MMII-PD-1-2-120 securely into control panel, fasten panel locking clips.
• Separate low-level analog input wiring from 120VAC power wiring to avoid induced noise and ground loop errors.
• Confirm power is 120VAC before energizing, verify wiring polarity on analog input terminals.
• Follow lockout/tagout procedure when wiring live panel circuits.
• Record configured scaling and alarm setpoints before replacement.
• After installation, calibrate zero and span with signal source, test relay alarm action before returning to service.
• Use shielded twisted pair cable for field 4–20mA transmitter wiring, single-point shield grounding.

Testing Procedure

1. Visual inspection: Check front LED display, keypad, housing and rear terminal block for cracks, burn marks or corrosion.
2. Install meter into 1/4 DIN panel cutout, connect 120VAC power and analog signal source wiring.
3. Apply power, confirm power LED lights and unit completes power-up self-check.
4. Inject 4mA, 12mA and 20mA reference analog signals, verify display reading and scaling accuracy.
5. Set high / low alarm thresholds, test relay actuation at trigger points and confirm contact switching.
6. Check noise immunity by simulating minor electrical interference, confirm reading remains stable.
7. Save scaling and alarm parameter records, log calibration results and tag spare unit for inventory.

FAQ

Q: What is Moore Industries MMII-PD-1-2-120 used for? A: It is a 1/4 DIN digital process panel indicator with dual alarm relays, powered at 120VAC, for local display and alarm of 4-20mA / voltage process transmitter signals.

Q: What does the part number suffix 120 mean? A: 120 = 120 VAC operating power supply for the instrument.

Q: How many alarm relays does MMII-PD-1-2-120 have? A: Two independent SPDT programmable alarm relays.

Q: What panel cutout size does this meter require? A: Standard 1/4 DIN panel mount cutout.