Hardware Questions and Answers


The JR-2000 can take 100,000 readings at sample intervals ranging from 10 seconds to 18 hours.
The battery life of the JR-2000 is warrantied for 3 years (-40 to 85°C) (-40 to 185°F).
Yes, the logger will flash its LEDs every 10 seconds when activated according to the following:
  • Red– Alarm indication or memory full
  • Green – Normal logging
  • Blue – Delayed start logging (up to 18 hour delay)
Yes, the JR-2000 has low and high temperature threshold settings. The logger will flash red when an alarm state has been entered (can be latched or dynamic)
The accuracy of the JR-2000 is better than +/-0.6°C over its entire range (-40 to 85°C) (-40 to 185°F)


While we have no official documentation or third-party testing, the product easily withstood our own water testing. The Nautilus casing has been tested in 2000 PSI, which is equivalent to the pressure at a depth of 1400 meters of water.
Low, mid and high calibration values can be adjusted using TrendReader (version 2.30 and higher).
The operating range for the Nautilus Standard is -40 to 85 degrees Celsius.The operating range for the Nautilus High Temperature is 10 to 125 degrees Celsius
The O-Ring should be moistened with silicon grease to maintain the waterproof seal.
The battery of Nautilus is 3 years.
Yes, however, it can only be replaced in the factory by ACR Systems Inc.


8 bit (1 part in 256) however, it can be optimized to the equivalent of 10 bit resolution.
It connects via the Lite-Link for OWL USB interface cable.
No, it comes with the software in an interface package (01-0230). You can also order the cable separately (01-0232).
It uses optical communication. You place the Light Wand in front of the optical eye of the logger and the communication starts automatically.
No, you can’t download data from an OWL logger Remotely.
The fastest sample rate is one sample every 0.2 seconds and the slowest sample rate is one sample every 12 hours.


To eliminate this issue, the PowerWatch VDR must be cleared of data at least once every four years.
PowerWatch is half cycle integrated so it synchronizes itself to the consecutive positive and negative zero voltage crossings of the sinusoidal AC line signal. If the AC waveform is so distorted or noisy that multiple zero crossings are detected, the PowerWatch reports loss of synchronization. For 60 Hz, zero crossings should occur regularly every 8.33 msec. For 50Hz, zero crossings should occur regularly every 10 msec.
The PowerWatch could be malfunctioning. This can be verified by having the PowerWatch monitor a good known AC source to see if the errors show up again. If the errors repeat on a clean AC source, or the maximum of 4000 events are logged in a short period of time, the logger is likely malfunctioning and needs to be sent in for service. Example: Error 152
More recent versions of PowerWatch Software (version 1.29a and above) and all versions of EventReader Software will not allow you to download data from the PowerWatch unless it is plugged into a power source.
Simply leave the unit plugged in when it is not in use.


No. Although it is water resistant, it is not actually waterproof. It does not carry an IP rating. Direct submersion is not recommended. There is a waterproof capsule (45-0013) available for submersion applications.
The SmartButton-L can take 2048 readings. Multiply this number by the sample rate you have chosen to calculate the logging duration. The unit can be set to stop when full, or first in, first out (memory wrap) modes.
Yes. You can set the sample interval from 1 minute to 255 minutes (4.25 hours), in one-minute increments. You can delay start by up to 6 weeks. You can also set Low and High alarm thresholds for alarm indications in the graphed data. You can enter a name or label in the description field as well.
ACR warranties the SmartButton for 1 full year after date of purchase.
The life of the SmartButton depends on the sample rate selected and the temperature range of prolonged exposure. At normal ambient (room) temperatures you can expect about 4-5 years of life. Temperatures over 50°C will shorten the internal battery’s life.
No, the battery can’t be replaced or recharged. Once it has expired, the unit should be disposed of in the appropriate manner.
You can’t completely disable the the SmartButton, you can minimize its battery consumption by setting the sample intervals to zero and saving the set up.
No, it is not possible to calibrate the SmartButton
No, TrendReader for SmartButton does not require a license key.
The TrendReader for SmartButton software can graph and display the data and export to various formats such as PDF, Text and CSV. The software can also open multiple graphs simultaneously (merge) for easy comparison / viewing of different data sets. The combined graph can be saved and converted to the previously mentioned formats.
Although the cable driver should install when the software is installed, sometimes it may not due to firewalls and antivirus software etc. The driver is provided in a directory within the TrendReader for SmartButton installation. You can find it at: C:\Program Files (x86)\ACR Systems\TrendReader 3\hardware Drivers\DS1W xSB Driver’ You may need to run it manually. (You may also need your System Administrator to grant permissions).
No, the old serial cable will let you make contact with the SmartButton, but will not allow you to make changes to the setup. Only the USB (blue dongle) interface cable will work with TrendReader for SmartButton software.


No, our probes are not waterproof. However, the tips are stainless steel and water-resistant.
Yes, you can. You will need to create a custom equation. To create a custom equation, you need to know the resistance of your probe at the three (low, mid and high) temperatures. Please refer to the Equation section of TrendReader Reference Guide for the details.
You should create a thermistor equation for your probe. The procedure for creating a thermistor equation can be found in the Equation section of the TrendReader Reference Guide.
The accuracy of SR1 and SR8 at 25°C is ±0.6°C (1.1°F at 77°F).The accuracy of SRP1 and SRP8 at 25°C is ±0.23°C (0.42°F at 77°F).
Note: The accuracy of the system is equal to the accuracy of the Thermistor Probe plus the resolution of the data logger. Thermistors are non-linear. This means that the accuracy of the Thermistor Probe varies over the entire temperature range of the logger. Therefore, the total accuracy of the system depends on the temperature range.
For example, let’s assume you use the ET-016 probe, a General Purpose temperature probe that is suitable for the range –35 to 95°C (-30 to 200°F). The accuracy of this probe is:±0.2°C between 0 and 70°C (±0.36°F between 32 and 158°F)±1.0°C above 70°C and below 0°C (±1.8°F above 158°F and below 32°F)
The total accuracy of the system depends on the temperature and whether you are using a SmartReader Plus logger.
No, you can connect only Thermistor Probes to SRP1 and SRP8 loggers.
These temperature probes use a resistive thermistor. The thermistor resistance varies with temperature. Since the conductor has an inherent resistance, there is a limit to the length of the conductor that can be added to a Thermistor Probe (without affecting readings). The maximum recommended length is 100 feet of two-wire 22-gauge standard conductor.


RH: Accuracy is ±3% from 10 to 90% and a temperature range of -20°C to 40°C ( -4°F to 104°F)Temperature: Accuracy is 0.23°C at 25°C (0.42°F at 77°F)
Yes. It comes with one internal RH sensor and one internal onboard temperature sensor built-in. Therefore, wherever you place the logger it will record the temperature and RH value. If you want to record the temperature and RH of a second room, you will require the EH-020A probe (which is the external temperature and RH probe). The part number for this optional probe is: 01-0040.
No. It is an optional accessory, ordered separately.
The EH-020A comes with a cable of 90 cm (3 feet).
Yes. The maximum recommended length is 100 feet of four-wire 22-gauge stranded conductor with a shield.
Organic solvents typically 1,000 to 10,000 ppmCorrosive agents (strong acids S02, H2S04, C12, HC1, H2S etc.) typically 1 to 10 ppmWeak acids typically 100 to 1,000 ppmBases typically 10,000 to 100,000 ppm
Once a year (when used under normal operating conditions).
Yes. When we calibrate the loggers we issue you a calibration certificate for the RH sensor (which is NIST traceable).Temperature NIST traceable calibration is available at an additional charge.


No. The media should be non-corrosive gases and dry air.
Gauge pressure is Zero PSI at atmospheric pressure.Absolute pressure includes the atmospheric pressure. So, typically with no pressure applied, it will read approximately 14.7 PSI.Absolute pressure = Gauge pressure + atmospheric pressure (for example: if the atmospheric pressure where you are is 14.7 PSI and your gauge pressure is 1 PSI then the Absolute pressure will be 15.7 PSI).
You can use SRP-004-30A loggers.
The accuracy of the pressure channels is +/-0.5% of full scale for the SmartReader Plus 4. This only applies over the range of 0-70°C (32 to 160°F), as the pressure modules require temperature compensation.
The maximum pressure range for the SRP4 is 150PSI Gauge. If you have a pressure transducer with the output of 0-25 mADC, or 0-200 mVDC, 0-2.5, 5, 10 Volt DC, then you can connect it to the SRP7 (process signal logger). You can also write a custom equation to convert the unit and get the pressure readings in the required units (e.g. PSI).
It is a Silicon piezoresistive strain gauge.
±0.05”WC (±12.5Pa) for the ±2”, ±1” & ±0.5”WC ranges; ±0.1”WC (±25Pa) for the ±5” & ±10”WC ranges.
Yes, you can. A SmartReader Plus 4 with an Absolute pressure sensor can be used to measure pressure in the negative direction up to one atmosphere.


Yes, you can. Just connect it to the 0-25mA channel of the logger.
The accuracy is +/-0.5% of full scale for the SRP7 logger.As an example, the accuracy of the 0-25 mA channel on SRP 7 is 0.125 mA.
Yes, you can. However, you should add an external resistor. That is, external circuitry is required.
Yes, you can. However, as it will be a custom logger and there will be an extra cost.
No. The EH-020A (relative humidity and temperature probe) cannot be used with these loggers. It can only be used with SR2 and SRP2 loggers. We do not have any relative humidity sensors for use with SRP7.
The SRP7 has four common inputs (labeled “Common”). These are not isolated from each other and can be used as the negative “-” connection for the power supply (or battery) and any of the transducers being logged by the SRP7. These common channels are all connected internally. A grounding loop can occur when there is more than one path to ground in your logger-transducer circuit. Ground loops can damage your SRP7 as well as your transducers. To avoid ground-loop problems in your SRP7 circuit: Do not use more than one grounded power supply to excite your transducers. Do not connect your logger to your computer for real-time readings unless your computer is battery-operated (i.e. not grounded) or your transducer power supply is not grounded.If you must use more than one grounded power supply in your SRP7 circuit, each transducer you use must be isolated. If you must use non-isolated transducers, then you must use a Signal Repeater/Loop Isolator between the transducer output and SRP7.


No. The SRP-10 comes only with 128K memory.
The accuracy of the SRP-10 over the temperature range of –230 to 300°C (-382 to 572°F) when using 100 &1000 Ohm Platinum probes is ±0.3°C (±0.54°F) + Resolution. For the 100 Ohm & 1000 Ohm Platinum probes the resolution is equal to ±0.14°C (±0.25°F).The accuracy of the ACR RTD logger is ±0.44°C (±0.79°F). Note that this is only the accuracy of the data logger. If you want to find the total accuracy (data logger and the RTD probe) then the accuracy of your RTD probe should also be added to the logger’s accuracy. For example, if you use the Platinum RTD probes (±0.06% at 0°C) of MINCO, at 0 degrees centigrade the probe has the accuracy of ±0.15°C. Hence, the total accuracy of the system at 0°C will be ±0.6°C.
Any RTD with a Temperature Coefficient of Resistance (TCR) of 0.00385 can be used with the SRP-10 (100 Ohm and 1000 Ohm Platinum probes).


Only if the probes have 0 – 5 VDC output signal. Current probes carried by ACR are compatible with SRP3 loggers.
Probe cable lengths of CT series probes are 5 feet long. It is recommended the cable not be extended.
Up to seven probes can be connected to SRP-3 loggers.
On the current channels, the accuracy of the system is +/-3.5% of full scale for SmartReader Plus 3 (above 10% of the range). The CT-253 current probe is accurate to +/-3% of F.S. The remaining 1% or 0.5% comes from resolution effects and logger circuitry. +/-3.5% of the full scale means that if the switch on the probe is set to 100 amps and a customer has a circuit with 25 amps flowing, the logger could record any value from 21.5 to 28.5 amps. Note that below 10% of the measuring range the current probes are not considered accurate. On the 0-5Volts voltage channels of the SRP3 the accuracy is ±0.5% of F.S. In other words, the accuracy is ±25mV.
The use of a single power supply, or isolated output is recommended to prevent ground loops.
The function of this resistor is to convert the 0-1 mA output of the transducer to 0-5 VDC (that should be used with SRP-3 loggers). Therefore, you should not remove the resistor.
The nominal voltage of the Ohio Semitronics voltage transducer is 575 Vac and outputs 5Vdc at 600Vac which is good for 480Vac as well at 80% FS.
We stock two different models: a 575 Vac, 3-phase, 60Hz transducer and a 120 Vac, 1-phase, 60Hz transducer. These transducers have a 0-5Vdc output proportional to the input. The input ranges are 0-600Vac for the 575V transducer and 0-150Vac for the 120V transducers. These transducers are designed for use with our SRP-003 Current and Voltage logger.


For the SRP-5 and SRP-6 (12 bit thermocouple loggers) the accuracy is +/-0.5% of the temperature range plus the resolution. The temperature range for the specific thermocouple type that is to be used and each thermocouple range is specified in our product catalog or Reference Guide. The resolution also varies with thermocouple types and is stated in either the product catalog or Reference Guide. Example: For a T-type thermocouple with the range of -200°C to 400°C (-325 to 750°F) and SRP6 logger, the accuracy is (0.5% * 600) + 0.4 = ±3.4°C which is ±6.125°F.
The maximum recommended cable length for the 20-gauge t/c wire is 300 feet (100 meters).
No. The correct equation numbers for the SRP-5 and SRP-6 loggers are: J type thermocouple: Equation 50 K type thermocouple: Equation 52 T type thermocouple: Equation 54 S type thermocouple: Equation 74 Do not use equation numbers 49, 51, 53 and 73 with SRP loggers.
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