The Mermaid electrical datalogger is a very small AC and battery powered datalogger able to monitor 3 phases for 3 motors plus 4 digital inputs and one analog input. It reads every input 10 times per second. A reading is recorded only when its value has changed. This way, for most lift stations, it is possible to record near one month of data before the newest rools over the oldest. Each motor input can be used to record frequency and current or voltage.

This device is perfect for preventive maintenance and troubleshooting electrical equipment. It could tell which motor, pump or equipment will probably fail next. It can find intermittent problems in minutes instead of hours or days, without replacing parts! Do not stop production if you do not have to.

Small, this datalogger can be hidden in the electrical panel and work several weeks on 2 C batteries.

Benefits

• Easy installation – Stations stays in operation during installation
• Ensures, without the need for on-site calibration, high levels of accuracy in any flow condition
• Automatically corrects the effects of temperature on level measurement.
• Easy installation with fast setup and no calibration required.
• Cellular Wireless and other communication formats available
• Economical, compact solution for flow monitoring
• A higher level of accuracy
• Easy installation, no profiling required
• Incredible Storage capacity
• Dynamic logging intervals ensures data is collected as conditions change
• Optional rainfall logging feature records and characterizes rain events.
• Disconnectable sensor for quick and easy field replacement
• Less Maintenance and Troubleshooting
• On-site sensor operation verification prior to leaving the site.
• Quick installation with no calibration required.
• Rain gauge connection, optional

Ideal Applications

• Information Program
• Billing / Custody Transfer
• Capacity Studies
• Collection Systems
• Combined Sewer Overflows (CSO) Studies and Monitoring
• Inflow and Infiltration (I&I) Studies
• Short Term and Long-Term Flow Monitoring
• NPDES Stormwater Compliance
• Permanent Collection System Monitoring
• Plant Influent and Effluent
• Sanitary Sewer Evaluation Studies

6.75in./17.2cm 3in./8cm	6.75in./17.2cm 3in./8cm	6.75in./17.2cm 2.5in./6.5cm	2.5in./6.5cm 3in./8cm	Need Mermaid Software to use recorded data
Front	Bottom	Top	Side

Specifications
Name/Item No.	Mermaid Datalogger / MLMMD
Product type	Multiple motor electrical recorder
Types of data recorded (always time stamped)	Based on sensor selection, but usually frequency, current, voltage, rain, analog and digital inputs, etc.
Number of digital inputs	4, with reserved for rain
Reading speed of digital input	10 Hz
Analog inputs	1 software set to 4-20mA or 0-5V, 9 electrical
Type of electrical inputs	9 inputs for current, voltage or analog modules (4-20mA, 0-5V, 0-10V, 0-24V)
Analog input reading speed	10 Hz
Analog input accuracy	± 0.1 %. This do not include the sensor precision
Digital output	1, activated with alarm setup or remote manually.
Internal temperature sensor accuracy	± 3°C
Memory	2 Mb
Memory (number of records)	500,000
External power	3 VDC 1 Amp
Operation time on batteries	2 weeks
Type of batteries	2 types C alcalines batteries or rechargeables
Integrated battery charger	YES
Download	RS232, USB using a cable converter, Land line modem, cellular modem, Ethernet using Serial converter
Communication Interface	RS232 (DB9)
Installation Options	DIN Rail
Dimension (inches)	3 x 2.5 x 6.75
Dimensions (cm)	8 x 6.5 x 17.2
Weight including 2 type C batteries	1 lb/0.45 kg
Warranty	3 years, parts and labor

Part No	Description
Software
MLSOFTM	Mermaid software
Power supply
MLPS1	90-240V AC 3 VDC 2 A
Connectors (for current sensors)
MLCTA6	Connector for 3 MLCT150 or MLCT300
Current sensors
MLCT5-15-75	Mini current sensor with selector 5A, 15A and 75A
MLCT150	Current Clamps 150 Amps
MLCT300	Current Clamps 300 Amps
MLCTP1500	Precision current sensors 1500Amps
Voltage sensor and accessories
MLPT600	3 phases 680 Volts voltage transformer
MLPTCBLY	Wires and clamps for Wye configuration
MLPTCBLD	Wires and clamps for Delta configuration
Analog input converters (to use on motor inputs)
MLAI420A	4-20mA analog input converter
MLAI05V	0-5V analog input converter
MLAI010V	0-10V analog input converter
MLAI024V	0-24V analog input converter
Digital input converter
MLLI120	Live Interface 12-120V (convert voltage status to ON/OFF for digital inputs)
Communication
MLUSB232	USB to RS-232 serial adaptor
MLCB232MF6	RS-232 extension cable 6′
MLERS232	Ethernet-Serial RS232 Interface
MCELETH	Cellular Modem with Ethernet port
Other Accessories
MLRG1	Rain gauge NWS approved
MLCASE1	Aluminum briefcase with moulded separators
MLPL	Wastewater pressure sensor for level and force main

No user manual available at this time.

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