Type 300 MP Electronic Unit Specification

1 to 4 Points Steam / Water Level Detection
Process Fault Indication
Probe Fault Indication
5 Relay output
Dual Power Supply
Handheld Programmer
Probe Validation
Remote Display Option

Upto 4 independent probe channels in one electronic enclosure means the installed cost per detection point can be appreciably lower than traditional float level switches.

The system incorporates a probe fault circuit that can distinguish whether probes are in a healthy state. The process fault circuit indicates a change in the normal operating state of each probe (e.g. from steam to water). The Probe Insert Assembly is welded into pipework or vessels at the selected detection points. This provides internal shrouding of the probe for defined water conductivities and a robust housing for external protection of the probe.

Multiple Probe Pipework Assemblies can be supplied to suit particular applications. The system incorporates an online test facility, for testing the system without effects plant condition.

Pressure Parts:
Type 801 Probe, rating 150 bar @ 340°C, requires Insert Assembly Type 701.
Type 802 Probe, rating 207 bar @ 370°C, requires Insert Assembly Type 702.
Versions of the above Probes with non-wetting PTFE insulators are available for low and high water conductivity. Rating 50 bar @ 220 °C.

Electronic Unit Specification:
Enclosure: Wall mounted glass-fibre reinforced polyester. Protection IP65/NEMA 4X.
Dims: 320H x 200W x 120D.

Inputs:
Discrimination between water and steam for upto 4 independent isolated channels. Switching threshold selected for water conductivities of 0.5, 1 or 2mS/cm.
Probe cable monitoring to suit water or steam normal condition for each channel.

Outputs:
Selection for Relays energised in the Safe plant condition. Two pole changeover contacts per channel. Single pole Changeover contact for System Fault. A time delay of between 1 & 20 seconds is available.
Contact Rating: Max Voltage - 250Vac, 220Vdc
Max Current - 8Amps
Load Switching - 240W / 2000 VA.
Display: LED indication on each channel, illuminated Red for abnormal (alarm) state. Yellow LED indication for Process Fault and 1 for Probe Fault. The selection of horizontal, vertical or combination configurations of probe channel validations, or Mains Supply failure initiates the System Fault indication. Green LED illuminated when both Mains Supplies are healthy.

Remote Display Unit:
Remote display unit indication is identical with the main display unit. Remote display will be connected through 1 no. (3 X 2) twisted pair cable. Maximum cable length from main to last remote should not be more than 600 meters.
Number of terminals: 1 nos. 5 way terminals.
Panel Cutout Dimension: 95 mm x 67 mm.
Enclosure protection class - IP20.

Supply Requirements:
Single AC Power Supply
92 - 127V @ 15VA, 48 - 63Hz
184 - 254V @ 15VA, 48 - 63Hz
Temperature Rating: -10 to 65 °C Amb.
-50 to 100 °C Storage.