CVS CVS 870 User manual

CVS 870 Limit Switch
Introduction
The CVS 870 Limit Switch is designed for
valves and actuators in hazardous locations.
The limit switch is CSA approved and is
rated EX db IICT6/EX tb IIIC T85oC explosion
proof, class 1, zone 1. It also carries ATEX
certification, and has an IP67 enclosure
rating.
Equipped with standard NAMUR shaft and
Stainless Steel bracket, for easy mounting
to all NAMUR mount actuators.
Secure water resistant case with multi angle
top and side visual indicator.
Red to indicate fully closed position, and
yellow to indicate fully open position.
Standard switch configurations are 2 single pole
double throw mechanical switches. Optional 2
double pole double throw switches or proximity
sensors are available. Also available in Stainless
Steel, model number CVS 875.
Features
-Die cast, powder coated aluminum housings
-Multi angle visual valve position from both
sides and top view
-Spring loaded splined “Quick Set” cam.
Eliminates the need to re-adjust after initial
setting.
-Dual cable entries: 2x3/4 NPT
-NAMUR Standard shaft and bracket
-Explosion proof, ExdbIICT6, weather proof.
-Multi point terminal strip
-Ambient Temperature rating, -20oC to 60oC
*(Tested to -50oC)
Instruction Manual
Website: www.cvs-controls.com Email: [e-mail]
Head Office
3900 101 Street
Edmonton, Alberta
T6E 0A5
Canada
Office: [phone]
Fax: [phone]
Calgary Sales Office
205, 2323 - 32 Avenue NE
Calgary, Alberta
T2E 6Z3
Canada
Office: [phone]
Fax: [phone]

SPECIFICATIONS
Dimensions-(mm)
Installation
The CVS Limit Switch uses NAMUR standard
shaft and mounting bracket. Suitable for various
applications, without the need for further
modification.
Ensure all supply pressure to the valve,
actuator, and other related devices is off prior
to installation.
Install NAMUR mounting bracket using supplied
fasteners. Determine correct application height
and install side mounting brackets accordingly.
Install assembled CVS 870 Limit Switch and
Bracket to valve or actuator accordingly.
CVS 870 Limit Switch with CVS350SR Rack and Pinion actuator,
and CVS 6700 Series Trunnion Ball Valve

Installation
CVS 870M1, 2 SPDT Wiring:
*EXT may be used for optional solenoid valve.
The CVS 870 Limit Switch accurately monitors
and transmits the valve position at the user
specified open/close set points.
Standard CVS 870 Limit Switch is 2 Single Pole
Double Throw(14VDC 5A, 30VDC 4A, 125VDC
0.4A, 250VDC 0.2A, 125VAC 5A, 250VAC 3A)
Additional configurations through to 2 Double
Pole Double Throw available. Contact a CVS
controls representative for more information.
Prior to wiring the CVS 870 Limit Switch, ensure
no explosive gas or material is present.
Ensure all power has been turned off.
For power connections that are unused, use
blind plugs which are explosion proof certified.

“Quick Set” Cam Adjustment –
Open/Closed
Additional adjustments should not be required
after initial setting. However, should there be a
need to make further adjustments to the CVS
870 Limit Switch, this is easily done at the field
level with only a 5mm hex key to remove the
cover.
Once open, adjustment to fully closed (red cam)
may be made by depressing the cam and
turning in either direction to obtain necessary
adjustment.
The same may also be done for fully open
(yellow cam) by lifting the cam and rotating.
Cams are on a spring loaded splined shaft and
will re seat when let go.
NOTES:
CVS Controls Ltd. strives for the highest levels of quality and accuracy. The information included in this publication is presented for informational
purposes only. CVS Controls Ltd. reserves the right to modify or change, and improve design, process, and specifications without written notice.
Under no circumstance is the information contained to be interpreted to be a guarantee/warranty with regard to our products or services,
applicability or use.
Selection, use and maintenance are the sole responsibility of the end user and purchaser. CVS Controls assumes no liability for the selection use
and maintenance of any product.
Red Cam Adjustment – Fully Closed
Yellow Cam Adjustment – Fully Open