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Moeller Instrument
Company, Inc

P.O. Box 668
126 Main Street
Ivoryton, CT 06442

In CT:

Gas Actuated Dial Thermometers
Remote Reading Commercial and Industrial Models

Military Models


How to Order

Moeller non-toxic, gas actuated dial thermometers are available in remote reading models for commercial and industrial use; models are also available for military applications, and other heavy-duty applications.

Dial Sizes:

Industrial & Commercial Applications: 4 1/2", 8 1/2"
Military application models: 3 1/2", 4 1/2", 8 1/2"


  • Non-toxic gas filling permits safe use in food processing, nuclear installations and similar process applications.
  • Shock and vibration resistant construction.
  • Anti-parallax white face dials with crisp black figures and graduations.
  • Remote reading with up to 125' of stainless capillary tubing protected with spirally wound armor.
  • Compensated for ambient temperature changes.
  • Linear scales.
  • Accuracy within 1% of included scale ranges (or per MIL spec.).
  • All models available with matching thermowells in a variety of materials of construction.
  • Military models meet or exceed MIL-T-19646 and other applicable MIL specs.
  • Balanced adjustable pointers.
  • Plain, flanged or threaded bulbs per appropriate MIL spec.
  • Yellow background dial faces with black graduations also available.
  • Grey finished, solid front safety cases, flush mounting ring per BUSHIPS DWG. #5000-S8700-841569 optional.

Remote Reading Models for Commercial and Industrial Applications
Dial Sizes: 4 1/2" or 8 1/2"
Available with 3/4" or 1" NPT separable sockets, Van Stone, flanged or weld-in connections

Standard Ranges
Ranges F Scale Div. FRanges FScale Div. F
-100 to 100250 to 5005
-30 to 1302100 to 8005
0 to 1602200 to 100010
20 to 2402400 to 120010
50 to 4005

Standard Ranges
Range CScale Div. C
-40 to 60*1
-30 to 130* 2
20 to 240* 2
50 to 400* 5
50 to 500* 5
* Not available in 8 1/2" case except on special order

Standard Models
Stem Length
4 1/2" Dial
Alum. Case
8 1/2" Dial
Alum. Case
Plain Bulb41202-PB81202-PB
Air Bulb41202-AB81202-AB

Sensing Elements/Materials:
Standard Bulb - 304 Stainless Steel
Plain Bulb - 304 Stainless Steel
Air Bulb - 304 Stainless Steel

Standard Bulb
A STANDARD BULB is made up of the 2 1/4" x 5/8" sensing unit plus a bendable stem on a sliding union connection which is mounted . The STANDARD BULB is provided in variable lengths "A" to match different length sockets - i.e. 4", 6", 9", 12", 15", 18", 24". A 1/2" NPSM sliding union connection is standard but a 1-1/4"-18 sliding union connection can be supplied instead. The STANDARD BULB is used where the sensing element is to be mounted in a socket, hub or flange.

Plain Bulb
A PLAIN BULB is the same as a STANDARD BULB except that the sliding union connection is not included. The PLAIN BULB is provided in a single length as shown; longer lengths are available on special order. The PLAIN BULB is used where the sensing element is not to be mounted in a socket, hub or flange and/or where the stem is to be bent to fit a particular application.

Air Bulb
An AIR BULB is a more sensitive sensing element then the STANDARD or PLAIN BULB but is longer overall and cannot be used in a socket. It is provided in a single configuration. Special supports for AIR BULBS are available - i.e. the split flange or the standoff support.

Military Models (MIL-T-19646)

Dial Sizes: 3 1/2", 4 1/2", or 8 1/2"

These thermometers are rugged, shock resistant (to MIL-S-901) and vibration resistant (to MIL-STD-167) instruments for military and heavy-duty applications.

Available with matching thermowells in a variety of materials of construction.

Standard Ranges: 3 1/2", 4 1/2", & 8 1/2" Dials

Range FScale
Div. F
18-40 to 1802
2420 to 2402
4050 to 4005
5550 to 5505
7555 to 7505
80100 to 8005
21200 to 100010
12400 to 120010


Designed as an alternate to standard MIL-T-19646 Gas Actuated Dial Thermometers with dual sensors, gas & electronic. Can replace standard existing units without installing new thermowells.



Primary element to be gas actuated remote reading thermometer built in accordance with MIL-T-19646 AMD. 7, Dial sizes 3-1/2" & 4-1/2", Bulb " diameter Class C style with -28 Union connection, Insertion length 2" or 4", Capillary length up to 20 feet maximum , Connection back or bottom, Mounting surface or flush panel.


Second Element three wire, 100 Ohm Platinum RTD, Alpha= 0.00385, 0.1 Ohm accuracy at 0 Deg C, 1/8 inch diameter.


Includes an integral electrical connection ( MS3451W10-3P OR MS3452W10-3P) to mate with cable connector MS3456W10-3S with back shell strain relief M85049/52-1-10W. The cable connector is supplied as part of the unit.

The stem diameter will not exceed 0.379 RTD & Bimetallic inclusive.

The Bimetallic stem & RTD will extend the same length as required to fit existing thermowell with 0.380 bore & 3/4-28 UNS-2 female thread length to be specified by customer in Specification Class # .

How To Order:

  1. Model No.
  2. Range
  3. Separable socket or other connection as required
  4. Back or bottom connection
  5. Capillary tubing length

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