PDR-27J Radiac Set
&HDER G-01(PDR-27S) Radiac Set
© Brooke Clarke 2006 - 2015
 |
 |
| 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.
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.
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.
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-27S (HDER G-01)
Electronicgoldmine Item G20846
Fig S1 Carry Case
Fig S2 Lid Open
Fig S3 PDR-27S (HDER G-01)
There's no label.
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
Back to Brooke's Home page, Radiation Detectors, Electronics page, Military InformationUnited 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
Page created 17 Jan 2006.