H38 | INCREMENTAL OPTICAL ENCODER
Introduction
The H38 is an explosion proof version of the field-proven H25 encoder
series. The H38 is UL certified for NEMA Class 4X and 6 (outdoor
nonhazardous locations) and Class 4X and 13 (indoor non-hazardous
locations). It is available with single and triple certifications for use in
hazardous locations and includes a standard shaft seal, double bearing
seals, and a cast aluminum housing with hard anodized and dichromate
sealed finish. The H38 is suitable for use in petroleum service industries,
solvent refining operations, spray painting applications, and explosive
dust environments.
SPECIFICATIONS
Mechanical
Shaft Diameter 3/8 nominal
Shaft Loading Up to 40 pounds axial and 20 pounds radial applied 1/4 from housing
Shaft Runout 0.0005 T.I.R
Starting Torque at 25C 4.0 in-oz (max)
Bearings Class ABEC 7 standard
Shaft Material 303 stainless steel
Enclosure Die cast aluminum, hard anodized with dichromate sealed finish. Shaft seals and sealed
bearings are standard to achieve environmental ratings.
8 10
Bearing Life 2 X 10 revs (1300 hrs at 2500 RPM) at rated load; 1 X 10 revs (67,000 hrs at 2500 RPM) at
10% of rated load
Maximum RPM 10,000 RPM (see frequency response, below)
4 2 3 2
Moment of Inertia 4.1 X 10 oz-in-sec UL & MSHA/ 1.7 X 10 oz-in-sec CEN
Weight 64 oz typical (approx 4 lbs)
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Copyright 2018 Sensata Technologies, Inc. SPECIFICATIONS (CONTINUED)
Electrical
Code Incremental
Output Format 2 channels in quadrature, 1/2 cycle index gated with negative B channel
Cycles per Shaft Turn 1 to 72,000 (see table 2, page 5). For resolutions above 3,600 see Note 7.
Supply Voltage 5 to 28 VDC
Current Requirements 100 mA typical +output load, 250 mA (max)
Voltage/Output (see note 3)
15V/V: Line Driver, 515 VDC in, V = V
out in
28V/V: Line Driver, 528 VDC in, V = V
out in
28V/5: Line Driver, 528 VDC in, V = 5 VDC
out
28V/OC: Open Collector, 528 VDC in, OCout
Protection Level Reverse, overvoltage and output short circuit (see note 3)
Frequency Response 100 KHz Typical, Higher frequency response available, see note 5
Output Terminations see Table 1, page 5
Termination Type Compression type, UL recognized. Accepts AWG 14 to 22, stranded wire, strip 1/4
Note Consult factory for other electrical options
Environmental
Enclosure Rating NEMA 4 X & 6 (IP66), outdoor Non-Hazardous locations, NEMA 4 X & 13 (IP66), indoor Non-
Hazardous locations
Temperature Standard operating all models, 0 to +70C; Storage all models, -50 to +90C; Extended temp
testing avail.: for UL, -40 to +80C; for CEN, -50 to +90C
Shock 50 gs at 11 msec
Vibration 5 to 2000 Hz @ 20 gs
Humidity 100% RH
Hazardous Area Rating UL listed for use in hazardous locations. Class I, Group D, or Class I, Groups C & D, and Class II,
Groups E, F & G. NEMA Enclosure 7.
Notes & Tables: All notes and tables referred to in the text can be found on pages 4 and 5.
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