H38 Series Parallel, Analog, SSI

Position Sensors & Encoders

The H38 absolute is an explosion proof version of the field-proven H25 encoder series. The H38 is UL certified for NEMA Class 4X and 6 (outdoor non-hazardous 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 absolute encoder is suitable for use in petroleum service industries, solvent refining operations, spray painting applications, and explosive dust environments. When your application needs the ability to recover position information quickly after a power loss and you are operating in a hazardous area—the H38 may be the answer to your needs.

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Features

Parallel 12 / 13 bit or SSI Transmission
Transmission lengths to 1000 feet
Accepts clock rates from 100 KHz to 1.8 MHz

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Specifications

Mechanical Electrical Environmental

Shaft Diameter	3/8” nominal
Flats On Shaft	Two flats, 0.80” long X 0.30” deep at 90º
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 25°C	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.
Bearing Life	2 X 10⁸ revs (1300 hrs at 2500 RPM) at rated load; 1 X 10¹⁰ revs (67,000 hrs at 2500 RPM) at 10% of rated load
Maximum RPM	10,000 RPM
Moment of Inertia	4.1 X 10^-4 oz-in-sec²
Weight	64 oz typical (approx 4 lbs)

Code	12 or 13 bits NB or GC; excess gray and BCD available
Counts per Shaft Turn	4096 or 8192
Count Transition Accuracy	± 1/2 bit maximum
Supply Voltage	5 to 28 VDC
Current Requirements	120 mA typical
Output Formats	Parallel: Gray Code, Natural Binary and Binary Coded Decimal; Serial: Serial Synchronous Interface (SSI); Analog: 4–20 mA, 0–10V
Voltage/Output	28V/V: Line Driver, 5–28 VDC in, Vout = Vin 28V/5: Line Driver, 5–28 VDC in, Vout = 5 VDC 28V/OC: Open Collector, 5–28 VDC in OCout SSI: 5–28 VDC in/5Vout
Protection Level	Reverse, overvoltage and output short circuit protection
Frequency Response	100kHz (1200 RPM for 12-bits, 600 RPM for 13-bits)

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 +70°C; Storage all models, -50° to +90°C; Extended temp testing avail.: for UL, -40° to +80°C; for CEN, -50° to +90°C
Shock	50 g’s at 11 msec
Vibration	5 to 2000 Hz @ 20 g’s
Humidity	100% RH
Hazardous Area Rating	Underwriters Laboratories listed for use in hazardous locations; NEMA Enclosure 7. Class 1, Group C & D, Division 1, NEC Class 2 circuits only, or Class 2, Groups E, F, and G.