Frequently Asked Questions - Electro-Sensors - Industrial Speed Monitoring Systems

What is the standard cable used on my hall-effect sensor?
3-conductor, Shielded, PVC jacketed, 22-gauge wire.

What type of cable should I use?
Electro-Sensors uses and recommends a high-quality 22 AWG audio signal cable.

For 2 conductor cable use a Belden 8761, or equivalent, shielded cable.
For 3 conductor cable use a Belden 8771, or equivalent, shielded cable.
For 4 conductor cable use a Belden 8723, or equivalent, shielded cable.
For 6 conductor cable use a Belden 9260, or equivalent, shielded cable.

What are the standard cable lengths available from the factory?
Sensors are available with 10', 50', 100', and multiples of 100' of cable.

How far can I run my sensor cable wire?
The standard cable length on most Electro-Sensors' sensors is 10 feet, however, our standard Hall-Effect Sensors can be mounted up to 1500 feet away from one of our meters or modules when using a quality cable.

What is each of the wires on my sensor for?

	ESI 906/907	ESI Prox	ESI Other
Common	Clear/White	Blue	Black
Supply	Red	Brown	Red
Signal A	Black	Black	Clear/White
Signal B*	Green	N/A	Green

*Present in bi-directional versions only

What type of Output does my sensor give?
Electro-Sensors standard Hall-Effect Sensors give a NPN Open Collector, current sinking output. The output is a digital square wave alternating from zero to supply voltage.

What value pull-up resistor should I use with an ESI sensor?
All Electro-Sensors' products have an internal pull-up resistor. However, if you are sending the pulses to a device without one, you will need to supply one. A suitable pull-up resistor can be anywhere from a 1 K-ohm - 3.3 K-ohms, however, be sure not to exceed 25mA on the sensor.

What is the maximum working voltage and current my sensor can handle?
Electro-Sensors' hall-effect sensors can work up to 24Vdc at 25mA maximum. However, we strongly recommend an operating current of less than 20mA.

Do I need a separate DC power supply to power the Hall-Effect Sensor?
When using the sensor with an Electro-Sensors product (Speed Switch, Tachometer, etc.) no separate power supply is needed. Those products have a built in supply to power the sensor. If not using with an Electro-Sensors product, check the specifications of that product.

Can my sensor be used with an Intrinsically Safe Barrier?
Yes, Electro-Sensors' Hall-Effect, MagnetoResistive, and Ring-Kit Sensors meet the requirements of intrinsically safe apparatus and associated apparatus for use in Class I, II, and III; Division I hazardous (classified) locations.
ANSI/UL 913-1988 - Category 16

How do I test my sensor to make sure it is working properly?

Electro-Sensors' analog sensors (Models 916, 917) can be tested by disconnecting the sensor from the electronics, and connecting an ohmmeter to the black and clear wires. A properly working sensor would have an ohm reading of approximately 10,000 ohms. Otherwise, contact the factory for details.
Electro-Sensors' standard Hall-Effect Sensors (Models 906, 907, 931, 932, 933, 1101, 1102, 1201, and 1202) require an electrical test. Please contact the factory for details.

Do I need a two or three piece shaft monitoring system?
Many applications are more suited to having the switch electronics and sensor right at the monitoring point (a two piece system) – that way everything is calibrated right there. Other applications require the switch to be remotely mounted from the sensor and disc (a three piece system). Space limitations, environmental considerations, and personal preference all play a part in determining the speed switch system required – figure out what you need before installation begins – it will save you time and money in the long term.

What type of sensor do I need for my application?
Electro-Sensors’ offers several different types of sensor housings to meet even the most demanding and diverse of application needs. Our standard aluminum body sensors will work in most applications, but we also have explosion proof sensors and the choice of either stainless steel or PVC sensors for corrosive environments. Our explosion proof sensors are also a great choice for harsh environments such as rock quarries or mining applications where a rugged housing is required to protect the sensing head. All of our sensors can be supplied with high-temp Teflon cable if required for higher temperature applications.

What are my pulse generating options?
Electro-Sensors’ offers a wide range of shaft end mount pulser discs and over shaft mount pulser wraps. If the end of the shaft to be monitored is readily available, then in many cases, it makes sense to choose a pulser disc to generate pulses. If the shaft end is not available, then you can use a pulser wrap – this is a custom made pulse generator that is a split collar that clamps around the shaft and installs in seconds. Over the years we have manufactured thousands of custom pulser discs and wraps, and either way we’ve got you covered.

What is the difference between RPM range and relay set point range?
Most of Electro-Sensors’ speed switches can be used to monitor shafts that operate at speeds of up to 10,000 RPM. The relay set point range, however, varies from switch to switch; this range is where the relay will trip when a fault condition occurs. The M100 switch for example has an operating RPM range up to 10,000 RPM, but a set point range of between 10 and 100 RPM. When calibrated the relay will trip somewhere between these 10 and 100 RPM. Knowing the difference between operating RPM range and relay set point range will assist you and save time when specifying a switch – for any speed.

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