Installation Instructions for the
Honeywell Low Temperature
Passive Probes, LTP Series
32309593
Issue D
Sensing and Productivity Solutions
1.0 General Information
Honeywell’s Low Temperature Passive Probes, LTP Series, is
a modular range of temperature sensors specifically designed
for potential use in transportation applications. The LTP Series
features a durable, closed-tip design that maximizes reliability
in harsh transportation applications while providing excellent
response time. The sensor’s thermistor sensing element
effectively senses gases and liquids because of its enhanced
sensitivity, accuracy and reliability.
2.0 Installation Information
2.1. Establish the sensor application environment in order to
determine whether a sealing element, such as an O-ring,
is needed, as well as a suitable material for the sealing
element. See Table 1 for recommended O-ring sizes.
2.2. Fabricate the corresponding installation port:
• 19 mm Hex: See Figure 3 for dimensions.
• 22 mm Hex: See Figure 4 for dimensions.
2.3. Mount sensor. See Table 2 for torques.
• 19 mm Hex: Use open-end wrench only.
• 22 mm Hex: Use socket wrench or open-end wrench.
2.4. Connect sensor with mating connector given in Table 3.
Table 2. Operating and Environmental Specifications
Characteristic Condition Parameter
Sensing element — NTC thermistor
Sensed media capability — engine coolant, engine oil, fuel, air, hydraulic oil, water
Response time (T63.2%) —
less than 15 s in stirred silicon oil
temperature step 25 °C to 85 °C [77 °F to 185 °F]
Current — 10 mA max. (self heating)
Insulation resistance — >10 MOhm at 250 Vdc, 25 °C [77 °F]
Accuracy — ±0.8 °C, 25 °C to 100 °C (See Table 3.)
Operating temperature
range
• continuous 500 hr at 150 °C
• 500 thermal shocks from -40 °C to 150 °C
• 100 thermal cycles from -40 °C to 150 °C
-40 °C to 150 °C [-40 °F to 302 °F]
Storage temperature range — -40 °C to 150 °C [-40 °F to 302 °F]
Vibration — 30 g sine, 10 Hz to 2000 Hz
Operating pressure — 10 bar max.
Burst pressure — 40 bar max.
Compliance — RoHS, REACH
Table 1. Recommended O-Ring Sizes
Thread
Inside Diameter, ID
(mm)
Cross Section
Diameter, CSD
(mm)
M10 X 1,25 8,1 ±0,2 1.6 ±0,8
M12 X 1,5 9,3 ±0,2 1.6 ±0,8
M14 X 1,5 11,3 ±0,2 2,2 ±0,8
M16 X 1,5 13,3 ±0,2 2,2 ±0,8
M18 X 1,5 15,3 ±0,2 2,2 ±0,8
3/4-16-2A UNF (SAE 8) 16,36 ±0,2 2,21 ±0,8
G 1/4 10,77 ±0,2 2,62 ±0,8
CSD
ID
2 Sensing and Productivity Solutions
Honeywell Low Temperature Passive
Probes, LTP Series
Issue D
32309593
Table 4. Resistance vs Temperature Curve and Sensor Accuracy
Thermistor Curve
TTemperature
(°C)
Resistance (Ohm)
Temperature
Tolerance
(°C)
Minimum Nomimal Maximum
NTC-1000 at 25 °C
(3947 Beta 0 °C/100 °C)
-40 28141.68 33487.40 38833.11 ±2.5
25 964.88 1000.0 1035.12 ±0.8
100 67.63 69.24 70.86 ±0.8
150 17.75 19.31 20.87 ±3.5
NTC-2057 at 25 °C
(3520 Beta 0 °C/100 °C)
-40 41061.23 48032,75 55004.26 ±2.5
25 1993.09 2057.00 2120.91 ±0.8
100 183.7 187.53 191.37 ±0.8
150 52.59 56.57 60.55 ±3.5
NTC-2252 at 25 °C
(3947 Beta 0 °C/100 °C)
-40 63419.83 75491.04 87562.26 ±2.5
25 2172.92 2252.00 2331.08 ±0.8
100 149.32 152.90 156.47 ±0.8
150 36.89 41.70 46.51 ±3.5
NTC-2795 at 25 °C
(4073 Beta 0 °C/100 °C)
-40 85718.02 102530.35 119342.68 ±2.5
25 2694.40 2795.00 2895.6 ±0.8
100 173.36 177.62 181.88 ±0.8
150 43.07 46.95 50.83 ±3.5
Table 3. Mechanical Specifications
Characteristic Parameter
Storage temperature range -40 °C to 150 °C [-40 °F to 302 °F]
Probe tip static side load 80 N
Electrical connector type:
Bosch Kompakt 1.1a Series (2-way 1928404226)
Delphi Metri-Pack 150 Series (12191170)
AMP Seal 16 (767428-1)
AMP Minitimer (2 position, 106462-1)
AMP Superseal 1.5 Series 2P (282104-1)
Deutsch DT04-2P (2 position)
Material
tin-plated brass
tin-plated brass
gold-plated brass
tin-plated brass
tin-plated brass
gold-plated brass
IP Rating
IP67, IP69K
IP67
IP67
IP64
IP67
IP67
Mating Connector
Bosch Kompakt (1928403874)
Delphi Metri-Pack (12162193)
AMP Seal 16 (776427-1)
Junior Power Timer (282189-1)
AMP Superseal (282080-1)
Deutsch DT06-2S
Mechanical connector thread size:
M10 X 1,25
M12 X 1,5
M14 X 1,5
M16 X 1,5
M18 X 1,5
3/4-16-2A UNF (SAE 8)
G 1/4
Standard
ISO 261
ISO 261
ISO 261
ISO 261
ISO 261
ISO J1926-3
ISO 228-2
Torque
8 ±1 N m
15 ±1 N m
15 ±1 N m
20 ±1 N m
20 ±1 N m
20 ±1 N m
15 ±1 N m