LTH Electronics

LTH Electronics

Model MXD73 - Multi-Parameter Monitor



The MXD73 is a microprocessor controlled multi-parameter instrument that can be installed with a user selected combination of up to 3 Sensor Input Cards. The instrument may be subsequently modified to meet changing requirements by the installation of additional, or different, cards and the attachment of the appropriate sensor(s). Utilising a multifunction easy to read QVGA LCD the instrument displays readings and provides feedback to the operator on the status of the sensors and instruments outputs. In addition the instrument features, depending upon configuration, up to six control relays and up to six 0/4 – 20mA current outputs. These can be used to provide fully configurable control, alarm and feedback. Finally the instrument also features an SD card interface which enables the user to backup and restore instrument settings, copy settings between instruments, log the sensor readings (optional extra) and to upgrade the instrument’s software.

  • Input Expansion Slots : 3 slots, user configurable with any combination of available input add-in cards.
  • Output Expansion Slots : 1 slot, user configurable with an additional output option add-in card.
  • Ambient Operating Temperature : -20°C to +50°C (-4°F to +122°F) for full specification.
  • Display : 3 ¾' QVGA back lit LCD module.
  • Buttons : 5 tactile feedback, micro-switched, silicone rubber.
  • Alarm LED’s : 2 Yellow LED's located above the main display area for instrument's alarm status, lit = active.
  • Digital Inputs : 8 contact closures for remote activation of user defined operations. Can be configured to operate in either normally open or normally closed modes.
  • Current Output Options : 1 as standard, expandable up to a total of 4 or 6 depending on the number of relays.
  • Current Output Specification : Each selectable 0-20mA or 4-20mA into 750 ohms max, fully isolated to 2kV. Expandable up to 5% of any operating range and offset anywhere in that range.
  • Current Output Adjustment : ±0.01mA, 3 point 0/4-20 mA for remote monitor calibration.
  • Setpoints and Control Relays Options : 2 change over relays as standard, expandable up to a total of either 4 change over relays, or 4 change over relays + 2 normally open relays depending on the number of current outputs.
  • Setpoints and Control Relays Options : Fully configurable setpoints with volt free contacts for each relay. Rated at 5A @ 30V DC / 5A @ 250V AC.
  • Setpoint LED’s : 6 Red LED's located above main display area for setpoint status indication, lit = relay energised.
  • Setpoint Modes : On/Off, Time Proportioning, Pulse Proportioning, Band and Latch. Delay timer adjustable from 00:00 to 59:59 mm:ss. Hysteresis 0 to 9.9%. Dose alarm timer, with supplementary initial charge function. Both adjustable from 00:00 to 59:59 mm:ss. Adjustable cycle time and proportional band in proportional modes.
  • Setpoint Cleaning : Cleaning mode with adjustable duration (max 10m) and interval times (max 24h), auto offline function with recovery timer.
  • Setpoint Alarm : Unit or channel alarm mode, whereby the relay can be energised under certain set conditions.
  • SD Card Interface : Enables backing up and restoring of instrument configuration, log the sensor readings (optional extra) and on site upgrading of instrument software. SD, SDHC and SDXC-FAT32 cards supported.
  • EMC : 2004/108/EC using BS EN 61326-1: 2013.
  • Low Voltage Directive : 2006/95/EC using BS EN 61010-1: 2010.
  • Power Supply : Universal 80-265V AC or DC, 15W max. LV Option 18 - 32 V AC or DC, 20W max.
  • Instrument Housing : UL 94-V0 PC/ABS.
  • Ingress Protection Rating (IEC 60529 Protection Rating) : IP66 to the front when panel mounted.
  • Weight : Maximum 880 grams (instrument only).
  • Dimensions Front : 128 x 116 x 23 mm (H, W, D).
  • Dimensions Rear : 89 x 89 x 161 mm (H, W, D), including connectors.

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