Richards Thermocouple and Temperature Sensor Catalog 16

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Plastic Thermocouple Head Material Characteristics -
√ Delrin© (Grey): Delrin is a grey pigmented acetal homopolymer made from Dupont resin. It is resistant to most acids, alkalies, sea
water and has a maximum service temperature rating of 275°F or 135°C. Delrin is not FDA approved for sanitary applications.
√ Nylon (Black): Nylon provides excellent electrical insulation and chemical resistance. It has a maximum service temperature
rating of 350°F or 176.6°C Nylon is not FDA approved for sanitary applications.
√ Polypropylene (Black): Black Polypropylene is not approved for sanitary applications. It has excellent resistance to organic
solvents, degreasing agents, acids, alkalies and most chemicals. Polypropylene has poor resistance to aliphatic and clorinated solvents.
Polypropylene has a maximum service temperature rating of 198°F or 92.2°C and will start to distort its shape after 220°F or 104.4°C.
√ Polypropylene (White): White Polypropylene is approved for sanitary applications. It has excellent resistance to organic solvents,
degreasing agents, acids, alkalies and most chemicals. Polypropylene has poor resistance to aliphatic and clorinated solvents.
Polypropylene has a maximum service temperature rating of 198°F or 92.2°C and will start to distort its shape after 220°F or 104.4°C.
NH - Nylon Head - Black, Screw Cover
Part Process Conduit Block Terminals Dimensions
Number Thread Thread Included Wires Figure NEMA Rating
NHS
NHD
NPT
1/2”
1/2”
NPT
1/2”
1/2”
AWTS
AWTD
Two / 2
Four / 4
Height
3” or 76.2 mm
Width
2.8” or 71.1 mm
Weight
3.9 oz. or 110 g.
NFPA Rating
None
Temperature Rating:
350ºF
1
NH
PPSH - Plastic Sanitary Head - White FDA Polypropylene or Delrin, Screw Cover
Part Process Conduit Block Terminals Dimensions Temperature
Number Thread Thread Included Wires Figure NEMA Rating Rating
White FDA
Polypropylene
PPSHD
Non - FDA
Delrin ©
DSHD
NPT
1/2”
1/2”
NPT
1/2”
1/2”
PPSD
PPSD
Four / 4
Four / 4
Height
3.2” or 81.3 mm
Width
2.8” or 71.1 mm
NFPA Rating
4x
198°F
or
92.2°C
275°F
or
135°C
2
PPSH & DSHD
PPH - Plastic Head - White FDA Polypropylene or Delrin, Screw Cover
Part Process Conduit Terminals Temperature Dimensions
Number Thread Thread Wires Rating NEMA Rating Figure
White FDA
Polypropylene
PPH
Non – FDA
Delrin ©
DH
NPT
1/2”
1/2”
NPT
3/4”
3/4”
Three / 3
Three / 3
198°F
or
92.2°C
275°F
or
135°C
Height
3.2” or 81.3 mm
Width
2.8” or 71.1 mm
NFPA Rating
4x
3
PPH & DHD
Thermocouple Heads - Black Nylon, White Polypropylene, & Gray Delrin
Manufacturing, Engineering and Sales Since 1938
Phone: 617.527.4385 Fax: 617.964.3746 Email:
ACH
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