Type 201 Electronic Unit Specification
Enclosure:
Wall mounted glass-fibre reinforced polyester, offering IP65/NEMA4X
protection for location in harsh environments.
Dims: 220H x 200W x 120D (mm)
Temperature Rating: -10° to +65°C
Inputs:
Discrimination between water and steam for 12 independent channels
numbered in ascending order. Discrimination threshold may be selected
for minimum water conductivities of, 0.5, 1 or 2 uS/cm.
Each channel includes the selection of a one or two wire connection
to the Probe depending on whether the probe is normally immersed in
water or steam. Any wire disconnection will revert the channel to
the opposite state to normal thus initiating fault declaration. For
standard situations where 6 probes are normally in water and 6 in
steam, a 5 metre (15') length of special high temperature 20 core
cable is supplied.
Power Supply:
The system uses a single AC source:
92 to 127 or 184 to 254 Volts AC at 15 VA, 48 - 63Hz
Display:
The unit incorporates a Two vertical column display of 10mm square
LEDs on the front of the enclosure. The green LEDs represent water
and Red LEDs represents steam. Particular LEDs can be selected to
flash on initiation of Alarm levels.
On channels 1 - 5 the appropriate red LED (Lo Water Level) and on
channels 8 - 12, the appropriate green LED (Hi Water Level) may be
programmed to flash. The flashing is initiated after the selected
delay period applied to the Alarm Relay.
Inputs:
(i) Alarm/Trip Relays. Four sealed relays, each with-
Singlepole changeover contacts provide Alarm and Trip signalling.
Two of these relays have integral delays (1 - 30 secs) and provide
Low and High Alarms or each relay may provide an output for a combined
Lo/Hi Alarm.
The two Trip relays are initiated by a 2 out of 3 Probe channel voting
circuit. The normal Lo Trip level may be selected for channel 10 or
11. The relays may be programmed for the normally energised or normally
de-energised state.
Contact rating: 350 Volts 5 Amps Max.
Max. Switching Power: AC-600VA
DC- 30W / 110V, 120W / 30V
(ii) Remote Display. Fifteen terminals are provided for direct connection
to a Remote Display unit.
(iii) 4/20mA Transmission Signal: An integral 4 to 20mA circuit where
each probe channel contributes a step change of 1.33mA. Selection
of 4mA to represent the all water or all steam state.
Max Load Impedance: 300 ohms
Remote Display Unit Options:
Type 20151A. Panel mounted IP20
Dims: 144H x 72W x 30D (mm)
This unit duplicates the display on the front of the main unit as
is intended for control room location.
Panel Cutout Dims: 138 x 67 (MM); 1.5 to 6.4mm thick
Type 20152 Plant mounted IP65.
Dims: 160H x 80W x 60W (mm))
Low consumption 5mm LED's
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10 or 12 Probe Ports