Cla-Val 131VC Series - Manual (Page 3)

Features
Alarm - Programmed to signal when system conditions exceed a desired
value or in the event of a system component failure. It can be configured
to be latching or non-latching, normally open or normally closed contact
with deadbands.
Absolute Alarm - Activates when the process variable exceeds
alarm set-point. It can be either high and/or low acting.
Deviation Alarm
- Shifts as the set-point is changed. It can be
symmetrical or asymmetrical.
Fault Alarm
- Activates when the process variable is lost.
Set-Point Rate of Change - Prevents accidental or sudden changes in
the programmed set-point. It is also invaluable when used on high differential
or surge sensitive applications where valve speed of operation must be
tightly controlled.
Process Variable Backup - Can automatically recognize secondary
process variable or can be programmed to open or close valve or can
default to backup pilot system using alarm function.
DC Power Supply - Provides source of power for signal transmitter.
Retransmission - Transmit process variable or set-point values.
Offsets - Adjusts the process variable and remote set point settings if
respective signals do not match.
Filter - Stabilizes process variable signal when required.
Security System - Prevents unauthorized changes.
Input Linearization - For flow measurement across orifices, venturies, etc.
Digital Inputs - Selects specific set-points. (optional)
NEMA 4X Enclosure (optional)
Input Signals
The 131VC-1 Electronic Control System is designed to accept
industry standard 4-20 mA full scale signals for pressure, flow or
level control from customer supplied transmitter(s).
Flow Measurement using a differential signal requires activating
the square root extractor to obtain direct flow readout.
Modulating Level Control requires the use of an optional X117
Valve Position Transmitter in addition to a level transmitter.
Valve Position Control requires an optional X117 Valve Position
Transmitter installed on the valve.
Other configurations are available on a special order basis, consult
the factory for details.
Specifications
Control Input:
4-20 mA full scale (others optional)
Control Parameters
Proportional Bands: 1 to 999%, settable in 0.1%
increments independently for opening and closing
Deadbands: achievable up to 15% of input range
Cycle Time: 1 to 120 seconds in 1 sec. increments.
Environmental Parameters
Temperature: 0°C to 50°C (32°F to 1 22°F)
Humidity: 10 to 90%, non-condensing
Power Consumption
15 watts Max. at 120 VA, 50160 Hz
Voltage and Frequency
Universal power supply: 90 to 250 VAC, 48 to 62 Hz.
24 to 30 volts AC or DC, +/- 5%.
Noise Immunity
Common mode rejection (process input) : >120 db.
Normal mode rejection (process input): >80 db.
AC line is double filtered and transient protected.
Snubbers are provided for each relay output.
Construction
Case: extruded, non-perforated black anodized
aluminum with ABS plastic sleeve.
Bezel: Black plastic ABS.
Chassis assembly: plug-in type.
Keys: Silicone rubber with diffusion printed graphics.
NEMA rating: front panel conforms to NEMA 4X when
instrument is properly installed.
Agency Approvals
Memory Retention
Lithium battery maintains all programming for approximately
ten years.
Security
There are two levels of access: restricted and full. A
configurable code is used to enter the full access level.
Functions not available in the restricted level are configurable.
LISTED
Process Control Equipment
4N66
UL
®
LR 84603