Q: How many readings can the JR-2000 take?

A: The JR-2000 can take 125,000 readings at sample intervals ranging from 10 seconds to 18 hours.

Q: How long is the battery life of the JR-2000?

A:  The battery life of the JR-2000 is warrantied for 3 years (-40 to 85°C) (-40 to 185°F).

Q: Does the JR-2000 have status indicator?

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)

Q: Does the JR-2000 have alarm capabilities?

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)

Q: What is the accuracy of the JR-2000?

The accuracy of the JR-2000 is better than +/-0.6°C over its entire range (-40 to 85°C) (-40 to 185°F)

Q: What is the resolution of OWL loggers?

 8 bit (1 part in 256) however, it can be optimized to the equivalent of 10 bit resolution.

Q: How does an OWL logger connect to the computer?

It connects via the Lite-Link for OWL USB interface cable.

Q: Does the interface cable (Light Wand) come with the OWL?

No, it comes with the software in an interface package (01-0230). You can also order the cable separately (01-0232).

Q: How does the light Wand work?

It uses optical communication. You place the Light Wand in front of the optical eye of the logger and the communication starts automatically.

Q: Does the OWL support remote communication?

No, you can’t download data from an OWL logger Remotely.

Q: What are the fastest and slowest sample rates for OWL loggers?

The fastest sample rate is one sample every 0.2 seconds and the slowest sample rate is one sample every 12 hours.

Q: Why are PowerWatch time stamps invalid after a prolonged period of time?

To eliminate this issue, the PowerWatch VDR must be cleared of data at least once every four years.

Q: What does the “Loss of Synchronization” error in PW mean?

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.

Q: What does the “ERROR ###” message recorded in a PW indicate?

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

Q: Can I download data from PW when it is not plugged in?

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.

Q: How can the battery life in a PW be conserved?

Simply leave the unit plugged in when it is not in use.

Q: Is the SmartButton waterproof?

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.

Q: How many readings can I take with the SB?

The SmartButton 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.

Q: Is the SB programmable?

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.

Q: How long is the SB warranty?

ACR warranties the SmartButton for 1 full year after date of purchase.

Q: How long will the SB last?

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.

Q: Can the battery be replaced?

No, the battery can’t be replaced or recharged. Once it has expired, the unit should be disposed of in the appropriate manner.

Q: Can I disable the SB to conserve its battery if it is to be unused for a long period?

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.

Q: Can I calibrate the SB?

No, it is not possible to calibrate the SmartButton

Q: Does TrendReader for SBsoftware require a license key?

No, TrendReader for SmartButton does not require a license key.

Q: Can I export or convert the data once it has been collected?

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.

Q: My interface cable is connected, but I don’t see the SBA cable icon under Connections in TR for SB. What is wrong?

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).

Q: Can I use the old serial interface cable with TR for SB?

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.

Q: Are your probes waterproof?

No, our probes are not waterproof. However, the tips are stainless steel and water-resistant.

Q: Can I connect my own thermistor probe to these loggers?

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.

Q: If I use my own probe, which equation number should I use?

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.

Q: What is the accuracy of these loggers?

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.

Q: Can I connect a thermocouple Probe to these loggers?

No, you can connect only Thermistor Probes to SRP1 and SRP8 loggers.

Q: What is the maximum recommended cable length of the ET temperature probes?

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.

Q: What is the total accuracy of the logger and the sensor?

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)

Q: Does the unit come with the RH sensor?

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.

Q: Does the unit come with an EH-020A sensor?

No. It is an optional accessory, ordered separately.

Q: What is the cable length of the EH-020A probe?

The EH-020A comes with a cable of 90 cm (3 feet).

Q: Can I extend the cable of the EH-020A probe?

Yes. The maximum recommended length is 100 feet of four-wire 22-gauge stranded conductor with a shield.

Q: What are the chemical tolerances of the SRP 2 internal RH sensor and the EH020A probe?

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

Q: How often should the loggers be calibrated?

Once a year (when used under normal operating conditions).

Q: Do you issue calibration certificates and are the loggers NIST traceable?

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.

Q: Can I measure water pressure with SRP 4?

No. The media should be non-corrosive gases and dry air.

Q: What is the difference between Gauge and Absolute?

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).

Q: Which logger should I use to measure atmospheric pressure?

You can use SRP-004-30A loggers.

Q: What is the accuracy of SRP 4 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.

Q: I want to record pressure values around 500 PSI. Do you have any pressure loggers for that range?

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).

Q; What type of pressure sensor does the SRP 4 LPD logger have?

It is a Silicon piezoresistive strain gauge.

Q: What is the accuracy of the SRP 4 LPD loggers?

±0.05”WC (±12.5Pa) for the ±2”, ±1” & ±0.5”WC ranges; ±0.1”WC (±25Pa) for the ±5” & ±10”WC ranges.

Q: Can I use ACR Data Loggers to measure dry air vacuum pressure?

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. 

Q: Can I connect the output of my transducers to these loggers?

Yes, you can. Just connect it to the 0-25mA channel of the logger.

Q: What is the accuracy of this 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.

Q: Can I measure 20 VDC with this logger?

Yes, you can. However, you should add an external resistor. That is, external circuitry is required.

Q: Can I order another combination of the channels, for example I would like 3 channels 0-25mA and the rest 0-5 VDC?

Yes, you can. However, as it will be a custom logger and there will be an extra cost.

Q: Can an EH-020A probe be used with the SRP 7 loggers?

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.

Q: What is the grounding problem and how can it be prevented?

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.

Q: Do you have 32K and 1.5Mb versions of the SRP 10?

No. The SRP-10 comes only with 128K memory.

Q: What is the accuracy of the SRP 10?

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.

What type of RTD probes can be used with this logger?

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).

Q: Can I use Fluke or any other current probes with your logger?

Only if the probes have 0 – 5 VDC output signal. Current probes carried by ACR are compatible with SRP3 loggers.

Q: What is the cable length of the probes and how much can they be extended?

Probe cable lengths of CT series probes are 5 feet long. It is recommended the cable not be extended.

Q: How many current probes can be connected to your logger?

Up to seven probes can be connected to SRP-3 loggers.

Q: What is the accuracy of these 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.

Q: Is there any restriction on the transducer if we use our own voltage transducers with the output of 0-5 Volts DC?

The use of a single power supply, or isolated output is recommended to prevent ground loops.

Q: On the voltage transducer from Scientific Columbus, there is a resistor, should it be removed or not? What is the function of this resistor?

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.

Q: Do you have a 600 VAC voltage transducer?

 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.

Q: What do you have for AC Voltage Transducers?

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.

Q: What is the accuracy of these loggers?

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.

Q: Can I use my own thermocouples?

Yes

Q: What is the recommended cable length?

The maximum recommended cable length for the 20-gauge t/c wire is 300 feet (100 meters).

Q: Is it possible to narrow the range on the SRP-5 and SRP-6 to reach better accuracy?

No

Q: Can I use narrow range equations like 49, 51, 53 with the SRP-5 or SRP-6 logger?

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.