CD V-711 Remote Shelter Gamma Survey Meter Page

CD V-711 Remote Monitoring Meter

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The CD V-711 Remote Sensor Radiation Meter was issued for use in Emergency Operations Centers. There were 600 of the Model 2 units made and only 200 of the Mk III units made. I only have the CD V-711 Model 2 metering unit. I would like to express a very sincere Thanks to Mike for the donation of this rare piece to the Civil Defense Museum! The CD V-711 Mk III photos on this page were sent to me by an Emergency Management Director who has the unit in his EOC.

CD V-711 Model 2, Nuclear Chicago Corp.

This is the metering unit of the CD V-711 Model 2 set manufactured by Nuclear Chicago Corp.Click photos to see larger.

The complete CD V-711 set consists of the meter unit, cables and a remote sensor. I don't have the cable or sensor for this metering unit. The button to the right of the selector switch is a meter light switch. The meter lights for as long as the button is pushed. Meter detection range is up to 1000 Roentgens/Hour. Scale ranges are .1, 1, 10 and 100 Roentgens per hour. The "handle" is for hanging the unit from a wall bracket. (See photo below.) Cable connectors to remote sensor are on top of the metering unit. This unit is fairly large and measures, Width 6.25" x Length 10.25" and Depth 4".

The CD V-711 set was designed for permanent mounting in blast-hardened emergency operations centers. The first requirement an EOC requesting a CD V-711 unit had to meet was...
"1. The EOC area must provide:
a. An estimated protection factor against fallout radiation in excess of 500.
b. An estimated blast overpressure resistance of more than 10 psi."
(Taken from Radiological Defense Planning and Operations Guide DOD/OCD March 1967)

The CD V-711 Model 2 takes no less than nine D-cell batteries to run it! The CD V-711 Model 2 was designed to hang on the wall from a bracket (see photo below). The cables to the remote sensor unit would be run through a steel pipe where the remote sensor would be mounted 3 feet above ground level. A CD V-711 Remote sensor still installed at a facility today is seen in the above photo circled in pink. The CD V-711 meter unit is no longer in place.

Here's a link to a photo of a CD V-711 in service. http://nutrias.org/~nopl/photos/civildefense/civdef07.htm Look at the back wall to the left of the photo on this page. A CD V-711 Model 2 hanging hooked up on it's wall bracket.

Manual picture of meter unit and remote sensor.

Photo at left is the CD V-711 hanging from it's wall mounting bracket. Thanks again to Mike for providing this photo. CD V-711 Model 2 meter light turned on. I believe this is the only civil defense radiological instrument with a meter light.

CD V-711 Mk III, Nuclear Chicago Corp.
Special Thanks To T.H. for the photos!

CD V-711 Mk III Metering Unit Click photo to see larger.
This model of CD V-711 has a 10,000 Roentgen per hour detection range. Scale ranges are .1, 1, 10, 100, 1000. The unit uses 2 cables from the metering unit to the remote detector outside the shelter.

The following information is from the FEMA CPG 4-1 Volume 6 Instrument Maintenance and Calibration Manual.

CD V-711 Mark III Remote Sensor Radiation Meter.
Two Hundred CD V-711 Remote Sensor Radiation Meters were produced under an engineer development contract. FEMA has granted all of these instruments to the states.
The contract did not require that instruction and maintenance manuals be furnished and none have been produced. Our Emergency Management Systems Test Facility and the Federal Depot have successfully serviced these instruments with the aid of the schematic circuit diagram in Figure 28-1.

The diagram in "Figure 28-1" is simply a copy of the schematic in the case.

Inside The CD V-711 Mk III and Remote Detector Unit
Click photos to see larger.

CD V-711 Mk III Uses 3 D-cell Batteries	Detector Unit Data Plate
Underside Of Detector Showing 2 Connectors	Detector Unit