Troubleshooting Guide
Problem
Possible Solution
Unit Dead
Check for proper supply at
terminals 2 and 10. See figure 5 on
page 3
No Analog out with zero
hertz displayed
Check for Sensor supply. It should
be Approximately 13.6 VDC
Check sensor Gap distance
Check Sensor Type (Variable 2)
Unit displays a
frequency but the analog
is incorrect
Check variable 1 for correct
frequency
Check your on the correct
analog output, voltage(VDC) or
current(mA)
Analog is unstable
Check gap distance
SA420 General Specifications:
Input Power
Input Current
Fuse Type (F2)
115 Vac, 60Hz (std)
2.5 VA
Sloblo .032A 5X20
230 Vac, 60Hz (opt)
2.5 VA
Sloblo .032A 5X20
12 Vdc (opt)
165 mA
Sloblo .250A 5X20
24 Vdc (opt)
135 mA
Sloblo .200A 5X20
Input Signal
Parameters
Sensor Supply
12 VDC (unregulated) @50 mA max.
Programmable Types
Open collector NPN / PNP
Logic Level 5 V Nom. 3 V Min.
Magnetic /- 75 MV Min.
Max. Amplitude
25 Vpk-pk Maximum
Frequency Range
0.01 Hz to 10 kHz
Minimum Input for
Full Scale Output
0.5 Hz = 3.8 RPM @ 8 PPR
(Lower full scale range is available,
consult Factory)
Analog Output Signal
Parameters
Types
0 - 10 VDC, 4 - 20 mA with 500
Ω
load max.
Accuracy (typical)
0.1% Linearity for both outputs
Step Response Time
Parameters
50 Hz Input and above
10 to 90% = 50 ms.
Below 50 Hz Input
10 to 90% = 30 ms + 1/Hz Input
frequency
Physical/Envlronment
Parameters
Mounting
DIN rail mount or Stand alone
Operating temperature
0°C to +60°Cz
Storage temperature
-65°C to +125°C
Electrical Connections
11 Position DIN rail terminal
block
DIN rail enclosure rating
NEMA 1
Free Catalog and Application Assistance
1.800.328.6170
Website: www.electro-sensors.com
990-001700 Revision I
8-8
255 Pulser Disc (std.)
Parameters **
Material
Nylon 12 Std,
(opt; PVC, Alum, Stainless-Steel)
Dimensions
4-inch diameter x 1/4-inch thick
Operating Temperature
-40ºC to +60ºC* (Nylon, PVC)
Operating Temperature
-40ºC to +150ºC* (Alum, SS)
Pulser Wrap (optional) Parameters **
Material
PVC Std.
(opt; Aluminum or Stainless-Steel)
Operating Temperature
-40ºC to +60ºC* (PVC)
Operating Temperature
-40ºC to +150ºC* (Aluminum, SS)
906 Sensor (Standard) Parameters **
Material Sensor Body
Aluminum 3/4 - 16UNF thread
Material Mount Bracket Plate steel
Output Types
NPN open collector current sinking
20 mA max
Signal Cable
3-conductor shielded, 10 feet length
std. (50 ft. or 100 ft. optional)
Operating Temperature
-40ºC to + 60ºC*
Air Gap
1/4 inch +/- 1/8 inch with standard
255 Pulser disc (1/2” magnets)
907 Explosionproof
Sensor (optional)
Parameters **
Class I, Div 1, Group D
Class II, Div 1, Groups E, F, G
UL File: E249019
Mounting Bracket
Material
Plate Steel U-Bolt Assembly
Other Specifications
Similar to 906 standard sensor
Specifications are subject to change without notice.
*For higher or lower temperature ranges, consult factory.
** For details on Discs, Wraps and Sensors, consult factory
or visit our website.
