PDR-27J Radiac Set

&

HDER G-01(PDR-27S) Radiac Set


Brooke Clarke 2006 - 2015
PDR-27 Radiac
                  Set
HDERG-01 PRD-27
                  Radac Set
PDR-27J
HDER G-01 aka PDR-27S


Background
Description
Batteries
Probe
Photos
Links

Background

This Giger-Muller set started out as the PDR-27A which was a tube type set using three different batteries and progressing to an all solid state unit using common "D" flashlight batteries.
Model
Meter
Battery
Probe
NSN
Manual
PDR-27A

BA-416
BA-413
BA-401
DT-53
?
TM 11-5543
PDR-27C
IM-74B
"
DT-106
?
TM 11-5543
PDR-27E
IM-74B "
DT-106 ?
TM 11-5543
PDR-27G
IM-74B "
DT-106 6665-543-1443
TM 11-6665-228-15, -20P, -40P
PDR-27J
IM-141
6 ea
BA-30
DT-196
6665-00-543-1435
TM 11-6665-209-10, -20, -40
PDR-27L
IM-173
6 ea
BA-30
DT-196 6665-00-865-3456
TM 11-6665-209-20, -40
PDR-27Q
IM-195
6 ea
BA-30
DT-196 6665-00-017-8903
TM 11-6665-209-20, -40
PDR-27P
IM-177
6 ea
BA-30
DT-196 6665-00-975-7222
TM 11-6665-224-15, 20P, -40P
PDR-27R
IM-203
6 ea
BA-30
DT-196
6665-00-961-0846
TM 11-6665-230-12, -12HR, -20P, -34, -40P
PDR-27S
HDERG-01
IM-238
2 ea.
BA-30
DT-613
6665-01-080-4418
TM 11-6665-249-14, -20P, -34P
PDR-27T IM-238
2 ea.
BA-30
DT-613
6665-01-120-5978 TO 11H4-7-3-201

Description

The PDR-27J set comes in a metal carry case that's 18 5/8" long x 7" wide x 9" high.  The top can be removed to access the contents and has a compartment inside the lid of which contains a paper titled "Maintenance Procedures".
Inside the box there's the PDR-27J, the ST-136/PDR-27 carry strap, H-43B/U headphones with a BNC-m connector on the cord.  There are 4 holes in the foam end part of the box to hold something (test sources and/or spare G-M tubes).

The HDER G-01(PDR-27S) comes in a case that's 12-1/2" hi x 8-7/8" w x 7-1/8" dp.

Ranges of 500, 50, 5, 0.5 milli R/hour.  Note a 100R dose will make you sick and 500R is fatal.

Batteries

The PDR-27J runs from six "D" flashlight batteries.  The photo at the top of this page shows the handle-battery cover removed (3 captured screws) and the batteries installed properly.  Note: at the bottom of the battery compartment each battery position is labeled either "positive" or "negative" (referring to the end of the battery that touches the bottom of the box.

Turing the switch to the first position "BAT COND" causes a meter scale to rotate into view with the word "b a t t e r y" and a high and low limit mark to come into view.  In my case the needle goes to about the center of the range.

Probe

The probe is made up of two separate GM tubes. 

V101 is a JAN5980 in the 5/8" dia x 5" housing.  This small tube is used for the 500 and 50 MR/hour ranges.  The dead time for the 5980 tube is 45 micro seconds.  3.5 gamma cps/ mR/hr.

V102 is a JAN5979 in the 1 1/4" dia x 7 1/2" housing with the hinged end cap which when opened allows alpha particles to be counted.   Both tubes are connected in parallel for the 5 and 0.5 MR/hour ranges.  The dead time for the large 5979 tube is 100 micro seconds.  45 gamma cps/ mR/hr.

The probe is permanently attached to the coiled cord and the cord is permanently attached to the housing.

Photos

PDR-27J

Fig J1
Fig J2
Fig J3 The round disk with the central screw next to the range
switch is the cover for the 4 range calibration pots.
Notice label on side
PDR-27J
                      Radiac Set

PDR-27S (HDER G-01)

Electronicgoldmine Item G20846

Fig S1 Carry Case
HDERG-01
                      PRD-27 Radac Set
Fig S2 Lid Open
HDERG-01
                      PRD-27 Radac Set
Fig S3 PDR-27S (HDER G-01)
There's no label.
HDERG-01
                      PRD-27 Radac Set

Links


Surplus Stuff - GM tubes & probes
United States Air Force, Radiac Set, AN/PDR-27T -
AN/PDR-27 GM Survey Meter -
Geiger-Mueller detectors (photos of many types) - Model 5979 End Window G-M tube
USGS - Terrestrial Gamma Radioactivity -
LND, Inc. - makes many types of probes and instruments with on line docs. - JAN5979 and JAN5980 GM tubes


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Page created 17 Jan 2006.