Private Labeling Available

Written by: Roselius, Lynnne
Sep 7, 2016

Have you always wanted your own private labeled inventory but always thought it was too expensive or time consuming to make this reality come true? We can help you with this, please contact us regarding getting your own, private labeled inventory (quantity limits do apply).

Meters for Electro-Welders

Written by: Roselius, Lynne
Sep 7, 2016

We’re now offering a few select products for welder manufacturers designed to be installed into electro-welders. First is our 3 digit DP-340 and DP-341 LED volt meters.  With surface space at a premium, these compact units will help free up spaces for other components. Another item is our DP-280H Hour Meter. This unit has a wide voltage range (5-277V AC/DC) and appropriate shock (55g) and vibration (25g)resistance, as well at a 95% relative humidity tolerance.  Contact us with any questions or for a quote on these items.

Battery Indicators Now Available

Written by: Roselius, Lynnne
May 27, 2016

We are now offering a full line of battery indicators available immediately. These units are availabe standard 12V/24V, 48V, and 72V read outs. They can be customized for different voltages as necessary.

Please contact us with any questions you might have about these units or for a quote.



Meters for the Automotive Industry

Written by: Roselius, Lynnne
May 11, 2016

We are now able to supply hour meters and battery indicators for the automotive industry. There are a variety of units available, with LCD and electromechanical displays, with different housing options, dual channel units with hour/hour, count/count, and hour/count configurations. The battery indicators are available with and without an hour meter as well. The meters are available with screw in mounting, bracketed mounting, and pc board mounting with manual reset, external reset, or no reset options. IP-65 rated, hermetically sealed units available to keep out dirt, dust, water and other similar elements. The units are vibration resistant.

All meters come with a 1 year warranty, and are competitively priced for OEM’s. If you have any questions about these meters please feel free to contact us.



Conflict Minerals Statement

Written by: Roselius, Herb
Jul 22, 2013


HR Components, dba Acculex, has received requests for more information regarding the Dodd-Frank Wall Street Reform and Consumer Protection Act, specifically section 1502 HR 4173 of July 2010, as it pertains to the minerals of Gold, Tantalum, Tin and Tungsten.

HR Components, Dba Acculex, works proactivley with suppliers and manufacturers to ensure a “DRC Conflict Free” supply chain. We are committed to legal and ethical business practices and although as a privately held company not subject to the Dodd-Frank/SEC reporting requirements, we do perform due dilignece to provide a “Conflict Free” supply chain for our customers.

If your company requires Conflict Mineral Templates and/or Certificates of DRC Conflict Free status for your particular product please contact us for more info.

This statement is also available for download

Vehicle Vacuum & Pressure

Written by: Roselius, Herb
Jul 18, 2011

Vehicle vacuum & pressure tester. Low cost sensor usually requires offset (zero) and Gain (span) adjustment.

Precision vacuum and low pressure adjustments require a digital readout. Low cost sensors may have large offset (up to +/- 10%) and span (up to +/- 5%) errors. Sensors are usually able to measure a vacuum as well as pressure.

A +/-30 to +30 psi sensor with a 4 to 20 mA output is easily handled by the DPL-3. Since vacuum is most usually measured in this range, it is advantageous to optimize the calibration for vacuum. The best way is to calibrate the meter to read -30.0 with the sensor at 30 psi of vacuum and to display 00.0 with the sensor exposed to ambient (0 psi gage) pressure. The positive or pressure readings will be within the linearity of the pressure sensor.



The ‘PSI’ annunciator can also be enabled on the DPL-3 display.

Capacitive Sensor Applications

Written by: Roselius, Herb
Jul 18, 2011

Resistance Temperature Device

Written by: Roselius, Herb
Jul 18, 2011

Simplify circuit design; Resistance temperature device (RTD) measurements.

The DPV-3 can be used to significantly reduce the complexity of external circuits required to handle many sensors.

For example RTDs usually require complex circuits to eliminate the offset created by the nominal resistance of the RTD sensor. In the circuit below, all that is required is a 1mA current source, an amplifier set for a gain of 70 , a 100 ohm Pt RTD, and a DPV-3.


  • 0 °C output = 100 ohms X 1 mA X 70 = 7.00 volts
  • 100 °C output = 138.5 ohms X 1 mA X 70 = 9.66 volts

None of the parameters are critical and need not be held to tight tolerances. There are no separate adjustments required in the external circuit. Both offset and span are done by the DPV-3.

The RTD sensor can placed in a stirred ice batch (0 °C) and the DPV-3 adjusted to display 00.0 °C. Next the RTD sensor is placed in boiling water (100 °C) and the DPV-3 is adjusted to display 100.0 °C.

This even eliminates RTD sensor interchangeability. In addition the °C annunciator on the DPV-3 can be enabled.

Scalable Voltage and Current Meters

Written by: Roselius, HerbScalable Meters/Custom Calibration
Jul 18, 2011

DPV and DPL Meters Simplify Readout in Units Measured


  • Convert to display of actual units measured. E.g.. 12 mA or 3 V input can be set to display 900 gallons.
  • Single stocked meter can cover multiple applications.
  • Negative and positive display from single polarity signal.
  • Eliminate need for offset (zero) circuits.
  • Direct readout from Transmitters & Transducers.
  • Eliminate external circuit adjustments.

Mass Flow Applications

Written by: Roselius, Herb
Jul 18, 2011

Mass Flow tranducers 0 to 5V output reads 0 to 2000 SCCM.

Mass flow sensors measure gas flow in many applications. They are usually mounted inside a system that very often prevents easy direct reading of the flow if the display is integral with the mass flow sensor. A typical output is 0V for 0 flow and 5V for the maximum range of the flow sensor.



A simple SPAN (gain) adjustment on a DPV-3 can set 5V to display 2000 counts on the display. However, the flow displayed is only valid for a standard gas, usually nitrogen. Other gases require a conversion factor to be applied to a reading.

For example:
The actual flow rate of a particular gas = flow rate of nitrogen X correction factor.

If the correction factor is less than one, such as 0.73 for ammonia (NH3), the DPV-3 can be simply readjusted for 2000 X 0.73 = 1460 with a 5V input.

If the correction factor is greater than one, such as 1.45 for helium (He), another input voltage must be selected such that the reading is less than 2000 (above that is an over range condition for the DPV-3). 2000 X 1.45 = 2900, therefore divide by 2, and a 2.5 V input should be adjusted to display 2900/2 = 1450.



Note: the correction factors for different gases vary for each mass flow transducer and should be requested from the manufacturer.

Photoelectric Sensors Characteristic Curves

Written by: Roselius, Herb
Jul 18, 2011

Characteristic Curves

For FT18M – FT18 – FT18EL – FTQ types


Photoelectric Characteristic Curves 01 Image Photoelectric Characteristic Curves 02 Image Photoelectric Characteristic Curves 03 Image
Photoelectric Characteristic Curves 04 Image Photoelectric Characteristic Curves 05 Image Photoelectric Characteristic Curves 06 Image
Photoelectric Characteristic Curves 07 Image Photoelectric Characteristic Curves 08 Image Photoelectric Characteristic Curves 09 Image
Photoelectric Characteristic Curves 10 Image

pH Measurement

Written by: Roselius, Herb
Jul 18, 2011

Measurement of acidity or alkalinity is very important in many industries and processes. Acidity or alkalinity is a measure of the relative ratio of Hydrogen (H+) ions to Hydroxyl (OH+) ions. If they exist in equal amounts, the solution is neutral, 7.0 pH. An increase of H+ will increase acidity, a lower pH, and an increase of OH+ will increase alkalinity, a higher pH.

Common electrodes used to measure pH will, based upon the Nernst equation at 25 °C, output 0 mV at 7.0 pH, +174 mV at 4.0 pH, and ?174 mV at 10.0 pH. Although many measuring instruments today use complex microprocessor based circuits to measure pH, a low cost basic circuit can take advantage of the wide DPV-3 offset and span capability to simplify the external interface circuit.



Probes for measuring pH usually require a very high input impedance buffer amplifier, (100 megohms or greater). This can be followed by an inverting high gain amplifier to output a useable voltage signal. For example with a total gain of -2000, pH 4.0 would output approximately +3.48 volts, pH 7.0 approximately 0.00 volts, and 10.0 pH approximately +3.48 volts.

These can be input directly into a DPV-3 set for the 5 Volt range, which can be adjusted to read the desired pH directly.


General Information for FT Series

Written by: Roselius, Herb
Jul 18, 2011

Photoelectric Sensors

These electronic devices, photoelectric sensors or photocells, use the light emission principle combined with the electronic and are made up of an emitter or luminous source, the light rays of which are detected by a receiver. The variation in luminous signal, obtained when interrupting this ray, is converted into an electrical signal and is measured and used by an electrical circuit. The light used is either infrared or red. By making use of this light various type of photoelectric sensors can be made.

The photoelectric sensors available in the FOTOSTAR range are the FT18MFT18FTQ series in direct reflection, with reflector with polarized light and emitter-receiver versions. Due to their flexibility regarding the various standard programmable versions these products offer the possibility of stocking reduction an are easily interchangeable with most of the units available on the market. They are used in the field of automation to check for the presence, counting, position control, etc., and they are compatible with most logic programmers.




In this type of function the emitter of the infrared light and the receiver are close together. The sensing is obtained by the reflection of the rays from the object. In the use of these photocells it is important to bear in mind the color and the type of surface of the object. With opaque surfaces the sensing distance is affected by the color of the object, light colors correspond to the maximum distances and vice versa. In the case of shiny objects the effect of the surface is more important than the color. The sensing distance in the technical data is related to matt white paper.




This type also has the emitter and receiver close together.

The reflection of the light emitted is obtained by using one or more reflectors and the sensing the object occurs when these rays are interrupted. These photocells allow longer sensing distances as the rays emitted are almost totally reflected towards the receiver.




Similar to the R type, these photocells use an anti-reflex device, the use of such a device, which bases its functioning on a polarized band of light, offers considerable advantages and secure readings even when the object to be sensed has a very shiny surface. They are not in the technical data affected by random reflections.




In this type of function the emitter and receiver of infra-red light face each other.

Sensing is achieved when this barrier of light is interrupted, they have a high reception as there is no dispersion between emitter and receiver. These photocells are therefore used for large distances where a high security of functioning is required.






Cylindrical construction M18x1 with housing and fixing nuts in stainless steel AISI 303. Types available in 10 ÷ 30Vdc NPN or PNP programmable and NO+NC static output, yellow led operation indicator and green led stability indicator, sensitivity adjustment incorporated. All types are available either with axial beam or 90° beam, cable exit or H plug for M12 connector.






Cylindrical construction M18x1 with housing and fixing nuts in plastic material. These are supplied in 10 ÷ 30Vdc with characteristics similar to the FT18M series and are also available with supply voltage of 20 250Vac with the possibility of programming NO or NC outputs. Types in direct current are only available with axial beam, cable exit without sensitivity adjustment.

Types in alternating current are also available with beam 90°, H plug exit for M12 connector and sensitivity adjustment.






Compact size in plastic housing, dimensions 50x50x18mm. Types available with supply voltage of 10 ÷ 30Vdc NPN or PNP programmable with NO+NC static output. Types available with supply voltage of 12 ÷ 240Vdc/ac (multivoltage) with relay output, programmable by means of a switch for the selection of the relay ON or OFF.

All versions are supplied with yellow led operation indicator and green led-stability indicator and trimmer for the sensitivity adjustment.

The FTQ series is available with cable exit or moving H plug for M12 connector to select the direction of the connector exit.

All the types in direct current with static output can be connected to normal or delayed power supplies of the ALNC-ALTP types and also to the CRTP rotation control.




  • Our photoelectric sensors are immune to ambient light, attention should however be given to other light sources.
  • In disturbed areas or areas that contain materials such as oil, powder etc., it is recommended that the barrier type separating emitter and receiver is used.
  • In the use of photocells with standard reflector ensure that they are not too close together, abnormal functioning could result.
  • Ensure the photocell is mechanically well fixed in order to avoid movement of the beam due to vibration.
  • Attention should be given to the fixing of the connection wires keeping them separated from cables supplying motors, contactors, etc.






It is the space in which it is possible to sense an object. In the case of direct reflection types it is the maximum distance between the photocell and the object, in the case of reflector or barrier types it is the distance between unit and the reflector or between units. (See drawing)



For the photocell the same terminology as inductive and capacitive sensors is used: N.O. = normally open, N.C. = normally closed. This refers to the state of the unit in the absence of product to be sensed. In the case of photocells light on / dark on is used. In the case of the direct reflection types N.O. is light on and N.C. is dark on. For the other types, N.O. is dark on and N.C. is light on.



In photocells the light signal is directed via an optical system to the object to be sensed. All the light emitted by our photocells is solid state and can be red or infrared. It is easily modulated and has an unlimited life.



This is the time lapse between providing a power supply and the activation of the output and is to avoid unwanted switching when the unit is powered.



The maximum ON /OFF frequency that the photocell can carry out per second. The maximum values of every unit can be found in the technical characteristics.



Indicates the maximum and minimum voltage values within which the photocell works correctly.



This is the relationship as a percentage between the alternating voltage (peak to peak) superimposed on the continuous supply voltage.



This is the max output current of the photoelectric sensor in continuous function.



This is the max current consumption of the photocell referred to the maximum limit of the nominal voltage and without load.


VOLTAGE DROPThis is the voltage drop measured with the photocell with output activates.



All direct current photocells have an incorporated protection which protects the internal circuits from damage in the case of a short circuit on the output stage. Once the short circuit is eliminated the photocell resets.



The table shows the maximum limit of an incandescent light or sunlight. Beyond this limit the photocell may not work correctly due to interference on the receiver.



Temperature limits between which the correct functioning of the unit is guaranteed.



This is expressed in IP followed by two numbers. In the case of photocells the first always 6 (completely protected against dust) and the second can be 5 (protection against water spray) or 7 (protection against full immersion).


The photoelectric sensors connected in this way will activate one output when they are excited simultaneously. In this
application it is necessary to take into account the following:

  • voltage drop
  • absorption of each photoelectric sensor
  • absorption of the final load
FT Series General Info 10 image


Connected in this way all photoelectric sensors can activate the common output independently when excited. In D.C.
types put a decoupling diode as indicated.

FT Series General Info 11 image


In this type a short circuit on the output is not allowed. Incorrect connection can cause irreparable damage to the
photocell. Connection can be carried out in series or in parallel. It is important in the case of parallel connection
that the connection is made to the same phase. When connected this way it is important to pay attention to the total
current loss (each photocell ≤ 2 mA) which can cause problems in a minimum load.

FT Series General Info 12 image


The supply voltage should be adjusted according to the characteristics of the sensor used. It is recommended to use
transformer with secondary voltage Vac lower than the direct voltage Vdc required.

The secondary voltage Vac is found as follows:
Vac = (Vdc + 1) : 1,41

The supply voltage Vdc of the sensor should be filtered with a capacity C at least 470 µF for each 200 mA used. If the
supply voltage Vdc is high it is recommended to follow the diagram with a proper voltage stabilizer.

FT Series General Info 13 image

Convert To Display Actual Units

Written by: Roselius, Herb
Jul 18, 2011

Convert to display of actual units measured. Eg. 12 mA or 3 V input can be set to display 250 gallons (946 liters).

Transmitter outputs are typically set for 4 to 20 mA with 4mA representing the low end of the range and 20 mA representing the high end of the range. For example in an application measuring the volume in a tank, a level transducer transmits 4mA when the tank is empty and transmits 20 mA when the tank is at full capacity of 500 gallons.

This type of transmitter has several benefits in industrial applications such as this one. The ?live zero? of 4 mA indicates the system and ?loop? is functioning. If the signal falls below 4 mA it indicates an open loop or other failure. A current signal is much more immune to electrical noise than a voltage signal, since only a parasitic or leakage current can cause an error. A current signal can be transmitted over longer distances than a voltage as long as the loop supply voltage can handle the voltage drop due to lead resistance.

The DPL-3 Series panel meters can be easily adjusted to read 000 with a 4 mA input and 500 with a 20mA input. Other intermediate inputs such as 8 mA would display a reading of 125 gallons, and 14 mA would display 313 gallons.

If a hose-proof & splash-proof display with larger digits is desired, the DPL-807 can be substituted for the DPL-3 Series . All these LCD meters are powered directly from the 4 to 20 mA signal eliminating the need for additional power supplies and simplifying the connection without requiring supply isolation. If backlighting is desired it can be powered directly from the loop supply and is isolated from the meter.

If the volume is to be displayed in other units, such as liters, the meters can be simply readjusted to display the level in liters. In this example 500 gallons is equivalent to 1893 liters, so the meter would be readjusted to display 1893 with a 20 mA input.

In the event that the converted value was greater than 2000, e.g. 1800 gallons is 6814 liters, a 4 ½ digit 20,000 count meter, the DPL-4, could be substituted for the DPL-3, and adjusted for the higher readings.

Multiple Pressure Transducers

Written by: Roselius, Herb
Jul 18, 2011

Readout in actual psi, bars, or pascals from multiple pressure transducers (voltage or 4 to 20 ma).

A manufacturer of custom pneumatic/hydraulic systems required displays for many different pressures. In advance of an actual order, they did not know what their immediate future requirements would be. They standardized on pressure transducers with 4 to 20 mA outputs, but still required stocking meters with seven different standard ranges from 200 psi to 10,000 psi. Further complicating this, they also were required to display various units of measure such as psi, pascals, bars, etc..

Since each meter usually had to be custom calibrated for them, it seemed production was always waiting for meters, even though they had a very large number of meters in stock.

The solution was simple, they reduced inventory and always had the meter they needed in stock. They stocked only two meters a 3 ½ digit (+/- 2000 count) DPL-3E and a 4 ½ digit (+/- 20,000 count) DPL-4E. The very wide offset (ZERO) and gain (SPAN) adjustment meant they could set them to display any units they required. They did pre-adjust them in the shop using a low cost 4 to 20 mA source, but did the final calibration on the production floor allowing them to match the meter to the transducer and eliminate the transducer span and offset error also. Since the meters can be adjusted at any two points, 0 pressure being an obvious choice for one of the points, they did not have to over pressure the system, just make the adjustments at their regular tests points.

Besides reducing inventory, and improving production flow, there was the added benefit of a significant cost savings per meter from their previous source. Part of this cost savings was reinvested in standardizing on the stunning blue backlit DPL-3EB and DPL-4EB meters, thus enhancing their product’s overall appearance.

A further benefit was these meters come with a ‘PSI’ annunciator on the display which they could turn on when the pressure measurement was displayed in psi.

Temperature Ranges

Written by: Roselius, Herb
Jul 18, 2011

Ambient temperature sensor 4 to 20 mA displays -40 to +150 °F.

In order to provide the best resolution over the temperature range of interest, most temperature measurement circuits output a signal that requires a significant offset as well as a span adjustment. There are very few applications which output 0 V or mA for 0° or 1 V or 1 mA for 1000°

Ranges as listed below are much more likely:

  • 4 to 20 mA to display -40 to +150 °F for ambient temperatures.
  • 0 to 10 V to display -60 to +500 °F (-51 to +260 °C) for temperature chambers.
  • 1 to 5V to display -150 to +100 °F (-101 to +38 °C) for cold testing.
  • 4 to 20 mA to display +300 to +900 °F (+149 to +482 °C) for plastics molding.
  • 0 to 5V to display +1000 to +2500 °F (+538 to +1371 °C) for kilns.

In the past some of these have been very difficult to do especially those which required a large offset with a small span or an offset in the wrong direction. All these can be readily handled today with a single DPL-3 or DPV-3 (note the +1000 to +2500 °F range would require using the DPV-4 to get the higher resolution).

For example:
Using a DPL-3,


4 mA input can be adjusted to display -40.0 


20 mA input can be adjusted to display 150.0