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Portable Power Monitor - ZN-CTX / CTM

Mã sản phẩm: ZN-CTX / CTM
Tình trạng: Có hàng

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This single unit solves all the problems you have with power checking at your worksite!

You can rely on it for your energy saving activity.


Many of the currently used power meters are not suitable for easily measuring power of a variety of machines and distribution boards. As a result, the electric power of a great number of machines in worksites is left unmeasured. 
Our Portable Power Monitor ZN-CTX21 solves such problems. It is the industry's first "portable power monitor for energy-saving activities at the worksite." 
It is "usable for anyone" "with ease" and indicates measurements "on site" immediately. 
This new concept-based Portable Power Monitor ZN-CTX21 will make a great contribution to energy-saving activities at the worksite.

ZN-CTX / CTM Features 2

Five Types of Dedicated CT units for Various Applications

Clamp type CT is added to the lineup.


Four types of split type CTs and a clamp type CT (200A) configure the lineup. 
The clamp type CT provides easy measurement in locations that are difficult for CTs of other types.

ZN-CTX / CTM Features 4

Power Consumption Checkup covers Devices to Distribution Boards


Changing the number of CTs connected to the branch cable enables measurement of single-phase 3-wire, three-phase 3-wire (unbalanced voltages in three-phase system) and three-phase 4-wire, too.

ZN-CTX / CTM Features 5

Checkup at the Time and Behavior to Watch Out for

Display of cumulative electric power (equivalent value)


When logging is started, the upper space displays the time and the lower space displays cumulative electric power (equivalent value). In this way, you can check electric power used from the start to the end of logging.You can set the logging conditions not only from the buttons but also by specifying the starting time or elapsed time.

ZN-CTX / CTM Features 7

Standby Electricity is also not Overlooked

Automatic range selection function


Our product is capable of measuring minute electric current that has been immeasurable by existing models. This feature enables you to check electricity consumption of a machine on standby.

ZN-CTX / CTM Features 9

Rating and performance

Logging unit (rating)


Model ZN-CTX21-A
Connectable sensor ZN-CTM[]1-[]A
Display 7-seg. 5-digit 2-step LCD display, auxiliary information indicator displays
Recording Interval 1 s, 2 s, 5 s, 10 s, 20 s, 30 s, 1 min. *1
Operation Function *2 Momentary power, Integrated power consumption
Measurement Mode Normal mode, Sleep mode *3, High-speed logging mode
Recording Mode Continue mode *4, Ring mode *5
External Output Alarm output (Photocoupler output) *6
Memory Capacity (Internal) Internal memory: approx. 6500 data items
Memory Capacity (External) SD card with SDHC compatibility *7 (Save measured values and converted values; 
save and read setting values)
Power Supply DC input: 24 VDC ± 10%; 
Batteries: Two AAA batteries *8
Current Consumption 80 mA max.
Battery Life *9 Approx. 1 week *10
Operating Temperature Battery Supply: -10°C to +60°C (no condensation or icing)
Operating Humidity 20% to 85% (no condensation or icing)
Storage Humidity/Temperature -15°C to +60°C, 20% to 85% (no condensation or icing)
Insulation Resistance 20 MΩ (500 VDC)
Withstand Voltage 1000 VAC, 50/60 Hz, 1 min.: Between the case and current input circuit
Vibration Resistance With mounting screws: 10 to 150 Hz, 0.7 mm double amplitude, acceleration: 
50 m/s2 for each in X, Y and Z directions for 80 min. 
With mounting magnets: 10 to 55 Hz, 0.3 mm double amplitude, acceleration: 
20 m/s2 for each in X, Y and Z directions for 50 min.
Shock Resistance 150 m/s2 in 6 directions (+/-X, +/-Y, and +/-Z directions), 3 times each *11
Material ABS
Degree of Protection IP30
Mounting Magnet mounting, screw mounting, hook
Weight (in Package) Approx. 500 g
Accessories Instruction Sheet, Startup Guide, Mounting Magnets*12, 
Alarm Output Connector *13, 
DC Cable, and Ferrite Core



*1. In high-speed logging mode, data is recorded in 83 ms at 60 Hz and in 100 ms at 50 Hz. 
*2. Momentary power and integrated power values are converted from the measured current. Correctly specify the 
       number of used channels, applicable measurement target circuit, CT type, frequency, voltage and power factor. 
*3. The display turns OFF after 10 seconds of no user operation and recovers by a key operation when SLEEP mode is 
       specified. LAN cannot be used when sleep mode is specified. 
*4. Automatically writes the data to the SD memory card when the internal memory reaches its capacity and continues 
       recording until the SD card memory capacity reaches its limit. The unit stops operation if there is no SD memory 
       card inserted when the internal memory reaches its capacity. 
       (Recording can be resumed after inserting an SD memory card and outputting the data to it at a press of button.) 
*5. Continues the recording of the latest measured values until the internal memory reaches its capacity. (If the internal 
       memory capacity exceeds the capacity, data is overwritten from the oldest one in the memory.) 
*6. Output when the integrated power upper limit specified in THR mode is exceeded. An alarm output is not available in 
       SLEEP mode. 
*7. An OMRON HMC-SD291 SD Memory Card or an SDHC Class 4 or higher memory card is recommended. 
*8. Nickel-metal hydride cells or alkaline dry cells can be used. Manganese battery cells cannot be used. 
*9. Battery life varies depending on the measurement environment, recording interval, operation mode as well as the 
       battery type and performance. 
*10. Conditions: Two AAA nickel-metal hydride cells; Sleep mode; Continue mode; Recording interval: 1 s; SD memory 
         card: HMC-SD291; Operation temperature: 23°C ; and Automatic range selection off 
*11. The installation place must be free from physical shock when using mounting magnets. 
*12. Already installed on the product by factory default. 
*13. OMRON's XW4B-02B1-H1 connector.


Logging unit (rating)


Model ZN-CTX21-A
Primary side rated current Dedicated CT (5 A/50 A/100 A/200 A)
Primary side allowable input current 120% of rated current (Continue)
Accuracy ±2.0%FS±1 digit (Ambient temperature 23°C, rated input, rated frequency) *
Measurement target frequency 50 Hz/60 Hz
Recording values Current value, instantaneous power, integrated power consumption
Applicable circuit Single phase two-wire, single phase three-wire, three-phase three-wire, 
three-phase four-wire


* An error of the dedicated CT is not included.

Dedicated CT unit (rating and performance)


Model ZN- 
Primary side rated current 5 A 50 A 100 A 200 A 200 A
Secondary winding 10 Hz to 5 kHz
Applicable frequency 3,000 turns
Insulation resistance Between output terminal and case: 50 MΩ minimum (500 VDC megohms)
Withstand voltage Between output terminal and case: 2,000 VAC 1 minute
Protection element 7.5 V clamp element
Allowable frequency of 
100 times 5,000 times
Applicable wire diameter * 7.9 mm dia. 
9.5 mm dia. 
14.5 mm dia. 
24.0 mm dia. 
23.0 mm dia. 
Operating temperature and 
humidity range
-20°C to +60°C 85% maximum (no condensation or icing)
Storage temperature and 
humidity range
-30°C to +65°C 85% maximum (no condensation or icing)
Voltage of circuit used 480 VAC maximum


* If you use a flat cable, select the cable based on the dimensions of the CT.

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