StoneL Quartz QX2 Series Valve Monitors – QX2G, QX2V, QX2H and QX2S
The StoneL Quartz QX2 Series Valve Monitors provide discrete open and closed position feedback for automated industrial valves. This product listing brings together four Quartz QX switching families: QX2G Maxx-Guard low-current proximity switches, QX2V mechanical SPDT switches, QX2H Maxx-Guard 3A proximity switches and QX2S Maxx-Guard switches with LED indication.
These products share the general purpose of monitoring valve actuator movement, but they are not electrically identical. Each series is designed for a different type of switching requirement. Therefore, selecting the correct complete model number is important for reliable integration with the existing control system.
Wuhan Yuli Automation Technology Co., Ltd. accepts inquiries for the 22 complete StoneL Quartz model numbers listed below. Customers can select their required variation and request availability, technical confirmation and a commercial quotation.
Key Features and Benefits
- Dual position monitoring: Two switching elements can provide separate valve open and closed feedback signals.
- Multiple switching technologies: Choose between low-current proximity, higher-current proximity, LED proximity and mechanical SPDT configurations.
- Quartz industrial enclosure: The QX platform is designed for demanding process valve monitoring environments.
- Visual position indication: Selected ordering codes include local indication arrangements that help operators identify valve status.
- Flexible connection options: Complete ordering codes distinguish different enclosure, connection and indicator configurations.
- Industrial compatibility: Suitable configurations can interface with discrete input circuits in automation and control systems.
- Replacement identification: Model-specific ordering information helps buyers avoid substituting incompatible switch technologies.
- International procurement: Customers can request quotations for individual models or multiple configurations in one order.
Available StoneL Quartz QX2 Models
The following models are grouped according to their primary switch family. Although all 22 codes are included as selectable variations, differences in enclosure style, conduit entry, indicator and approval options must be checked against the exact manufacturer’s ordering information.
| Model Number | Switch Family |
|---|---|
| QX2GE02NRA | Maxx-Guard Low Current |
| QX2GE03NRA | Maxx-Guard Low Current |
| QX2GR05NRA | Maxx-Guard Low Current |
| QX2GR06NRA | Maxx-Guard Low Current |
| QX2GCR03HRA | Maxx-Guard Low Current |
| QX2GK03HDM | Maxx-Guard Low Current |
| QX2VB02HDM | Mechanical SPDT |
| QX2VB02SDM | Mechanical SPDT |
| QX2VCK02SDM | Mechanical SPDT |
| QX2VCK03HDM | Mechanical SPDT |
| QX2VCK05HDM | Mechanical SPDT |
| QX2VCR02HRA | Mechanical SPDT |
| QX2VK02HDM | Mechanical SPDT |
| QX2VK05HDM | Mechanical SPDT |
| QX2HE02NRA | Maxx-Guard 3A |
| QX2HE03NRA | Maxx-Guard 3A |
| QX2HR05NRA | Maxx-Guard 3A |
| QX2HR06NRA | Maxx-Guard 3A |
| QX2SE02NRA | Maxx-Guard SPDT LED |
| QX2SE03NRA | Maxx-Guard SPDT LED |
| QX2SR05NRA | Maxx-Guard SPDT LED |
| QX2SR06NRA | Maxx-Guard SPDT LED |
Ordering note: Model codes are listed as supplied by the customer. Full-code validity and configuration details should be confirmed before finalizing a purchase.
Technical Specifications and Series Comparison
| Series | Switch Type | Key Characteristics |
|---|---|---|
| QX2G | Two SPDT Maxx-Guard proximity switches | Low-current switching; 0.20 A at 120 VAC or 0.30 A at 24 VDC |
| QX2V | Two SPDT mechanical switches | Mechanical contact switching; exact rating depends on installed switch specification |
| QX2H | Two SPDT Maxx-Guard proximity switches | Up to 240 V, 3 A and 100 W under documented limits; minimum load also applies |
| QX2S | Two SPDT Maxx-Guard proximity switches with LED | 0.10 A at 120 VAC or 24 VDC; LED-related voltage drop must be considered |
The QX enclosure family uses industrial materials selected for valve monitoring environments. The specific enclosure material, connection dimensions, operating temperature and hazardous-area approvals must be confirmed for each ordered variation. The ratings above describe the documented switch families, not an unconditional rating for every complete assembly.
QX2G Maxx-Guard Low Current Valve Monitor
The StoneL Quartz QX2G series is designed for discrete feedback circuits that use low-current SPDT proximity switching. The Maxx-Guard design uses sealed switching elements and is intended for suitable industrial control inputs. According to StoneL technical documentation, the G-type switch has rhodium contacts and documented electrical ratings of 0.20 A at 120 VAC and 0.30 A at 24 VDC.
QX2G models are appropriate candidates when an existing valve monitor uses the same G-type sensing technology. However, complete model numbers must still be checked because housing and visual indicator configurations can vary.
QX2V Mechanical SPDT Valve Monitor
The StoneL Quartz QX2V series uses two conventional SPDT mechanical switches for valve position monitoring. This makes QX2V different from the Maxx-Guard proximity families, even though the products share the Quartz enclosure platform. Mechanical switching can be useful in applications designed for direct changeover contact feedback.
Customers replacing a QX2V should confirm the original mechanical switch specifications, contact loading, terminal arrangement and mounting configuration. Do not assume that a QX2V can be replaced by a QX2G, QX2H or QX2S without checking the electrical circuit and actuator interface.
QX2H Maxx-Guard 3A Valve Monitor
The StoneL Quartz QX2H is intended for applications requiring the higher-current Maxx-Guard SPDT switch family. Manufacturer literature specifies a maximum voltage of 240 V, maximum current of 3 A and maximum power of 100 W for the H-type switch, together with a minimum load requirement.
These values must not be interpreted as permission to operate simultaneously at every maximum rating. Electrical circuit design should follow the complete manufacturer’s specifications. When replacing a QX2H, verify the load and original switching configuration before selecting a new unit.
QX2S Maxx-Guard SPDT LED Valve Monitor
The StoneL Quartz QX2S combines SPDT Maxx-Guard proximity switching with LED indication. The LED function can help provide local electrical status information in compatible applications. The documented S-type electrical ratings are 0.10 A at 120 VAC and 0.10 A at 24 VDC.
Because the LED circuit introduces a voltage drop, the QX2S must be evaluated for compatibility with the connected control input. It should not automatically be substituted for a non-LED QX2G configuration. Always compare the complete model number and the required electrical characteristics.
Industrial Applications
StoneL Quartz QX2 valve monitors are used in automated on/off valve applications across industrial process facilities. Relevant industries include oil and gas, petrochemical processing, chemical manufacturing, power generation, pulp and paper, water treatment and general industrial production.
For example, a plant may need to confirm whether a pneumatic actuator has moved a valve to its commanded open or closed position. A correctly selected dual-switch monitor can provide the necessary discrete feedback. This information can then be interpreted by a compatible control system for operating status and maintenance diagnostics.
Application suitability depends on the electrical circuit, actuator mounting, ambient environment and the exact unit’s approval markings. In hazardous locations, installation must comply with the certification and instructions applicable to the supplied configuration.
How to Choose the Correct QX2 Model
First, identify the switch technology required by the existing control circuit. Select QX2G for the documented low-current Maxx-Guard family, QX2V for mechanical SPDT switching, QX2H for the higher-current Maxx-Guard family or QX2S where the LED switch configuration is required.
Next, confirm the complete ordering code. The additional letters and numbers may distinguish enclosure configurations, conduit entries, visual indication, shaft arrangements or approval-related options. Finally, compare the existing nameplate and wiring information before accepting an alternative model.
For replacement inquiries, provide the original model number, quantity, destination country and photographs when available. This information helps purchasing teams communicate the required configuration and reduces the risk of ordering a product that looks similar but has different electrical characteristics.
Why Choose Wuhan Yuli Automation?
Wuhan Yuli Automation Technology Co., Ltd. supplies industrial automation components and replacement products to international customers. Our product range includes StoneL Quartz valve monitors, valve positioners and related process automation equipment.
We assist industrial buyers with complete model-number inquiries, sourcing requests and international quotations. Customers can request individual QX2 variations or submit multiple model numbers for a combined quotation. Final availability, pricing, delivery time and warranty conditions are confirmed in the sales quotation.
Frequently Asked Questions
What is the StoneL Quartz QX2 Series?
It is a group of industrial valve position monitors using different dual-switch configurations for automated on/off valve feedback. This listing covers QX2G, QX2V, QX2H and QX2S.
Are QX2G and QX2H interchangeable?
Not automatically. Both use Maxx-Guard SPDT switching, but their documented electrical ratings are different. Verify the control circuit and complete ordering code.
Is QX2V a Maxx-Guard proximity switch?
No. QX2V is the dual mechanical SPDT switch family, while QX2G, QX2H and QX2S use Maxx-Guard proximity switching technologies.
Does QX2S include LED indication?
Yes. The QX2S switch family includes LED functionality. The connected circuit must accommodate the documented electrical characteristics.
How can I request a quotation?
Send the complete StoneL Quartz model number, required quantity, destination country and any special configuration requirements to our sales team.
