Type 202MP Electronic Unit Specification
Enclosure:
Wall mounted glass-fiber reinforced polyester enclosure, IP65 / NEMA
4X protection for location in harsh environments.
Dimensions (mm): 500 H x 400 W x 200D)
Temperature Rating: Ambient: - 10 C to 65 C Storage: 50 C to 100 C
No of Channels: Maximum 48 Channels. Configurable from 6 to 48 Channels
through handheld programmer.
Power Supply:
Two independent AC sources 90 to 270 Volts AC @ 36VA, 48-63Hz.
Inputs:
From Conductivity types probes 2-wire connection. 48 Channels numbered in ascending order.
Probe Cable:
Special PTFE high temperature cable maximum 30 meters length. For longer cable length use 4 meters special PTFE high temperature cable and balance 26 meters ordinary instrumentation cable through junction Box.
System Measurement:
Microprocessor / Microcontroller Based fully integrated electronics
unit. Separate controller are used for ODD and EVEN channel to scan
the probe signal and do necessary discrimination for Water, Steam,
Open Circuit and Short Circuit. System based on 8/16bit processor
and having RS485 serial communication with the peripherals and Remotes.
Total 10 Cards, either Remote Display or Remote Relay card with additional
power supply, can be connected in daisy chain configuration with RS485.
Programmer interface used to program the field parameters through
handheld programmer and diagnosis the system.
Display:
Two vertical columns of LED (BAR Graph) are provided on the front
of the enclosure. 10 x 10 Sq. mm each LED for 16 Channels.
5 x 10 Sq. mm each LED for above 16 channels to 48 Channels.
For any other combination of channels the bottom redundant LED will
be blank i.e for 40 Channels, bottom 8 rows will be blank. Left column
is GREEN LED and Right column is RED LED. Two 10 x 10 Sq. mm. Yellow
LED at top for System fault indication always in 2 Hz blinking during
any system fault. Left yellow LED for ODD channel and Right yellow
LED for EVEN channel.
System Fault:
System fault occurs during following conditions.
Any of the power supply / power pack failure.
Probe cable short circuit / open circuit in each channel.
Contamination or short circuit in probe.
Ground failure in the probe column.
RL8 DPDT sealed relay is used as system fault relay in Relay output
card and activate in any other above system fault condition.
Contact rating: DPCO - 8 Amps, 250VAC / 30 VDC
Switching Power: 2000 VA / 240W
Outputs:
Alarm / Trip relays:
7 DPDT sealed relays are used for alarm and trip signaling and this
can be extended up to 15 relays by an add-on relay card. Relays can
be configured to any channel as per plant requirement in the field
through handheld programmer. On the configured channels any abnormalities
will be indicated by 10 Hz blinking of that particular channel along
with the activation/ deactivation of the relay. Spurious Alarm / trip
action is prevented while fault occurs on respective alarm / trip
configured channel.
Trip:
logic ensures positive trip on plant fault as well as eliminates spurious
trips through its voting logic. Each relay can be configured for normally
energised or de-energised with time delay action for 1 to 10 secs.
Contact rating: DPCO - 8 Amps, 250VAC / 30 VDC
Switching Power: 2000 VA / 240W
4-20mA Signal:
Two 4-20 mA DC analogue output signal whereby each probe channel contributes
a step change of '16 / no of channel' mA. Selection of 4 mA to represent
the all water or all steam state can be configured through the handheld
programmer. Galvanic isolation is also available as optional with
both the 4-20mA output.
Load impedance: 300-Ohm maximum for non-isolated output and 600-Ohm
maximum for isolated output.
Remote Display Unit:
Remote display unit indication is identical with the main display
unit. Remote display will be connected through 2 nos. (one for ODD
channels and one for EVEN channels) 8 core twisted pare cables. Total
two remote display unit can be connected in cascade with main power
supply. However, more remote display unit can be connected with local
power supply unit as additional. Maximum cable length from main to
last remote should not be more than 600 meters.
Number of terminals: 2 nos. 6 way terminal (one for ODD and other
for EVEN)
Panel Mounting Size: 238mm x 96 mm for 16 Channels.
Panel Cutout Dimension: 233mm x 91 mm for 16 Channels.
Enclosure protection class - IP20 OR IP65 (optional).
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upto 48 Probe Ports