This portable 4 gas monitor combines carbon monoxide, hydrogen sulfide, oxygen and combustible gas measurement in one instrument. The MH-1200H-S4 uses diffusion sampling, with electrochemical sensors for CO, H2S and O2 and a catalytic combustion sensor for the LEL channel. It provides the four readings through a monochrome LCD and uses sound, light and vibration for alarm indication.
Four Gas Channels in One Configuration
The instrument is supplied as one four-channel configuration. Each gas has its own measurement span and concentration unit:
| Gas channel | Measurement range | Sensor principle |
|---|---|---|
| Carbon monoxide (CO) | 0-1000 ppm | Electrochemical |
| Hydrogen sulfide (H2S) | 0-100 ppm | Electrochemical |
| Oxygen (O2) | 0-30% Vol | Electrochemical |
| Combustible gas (LEL) | 0-100% LEL | Catalytic combustion |
Use these channel ranges when comparing the monitor with the requirements of your monitoring procedure. CO and H2S are measured in ppm, oxygen in percent by volume and combustible gas in percent LEL. Diffusion sampling measures air at the instrument inlet. Keep the inlet exposed to the air being checked and follow the instrument instructions for calibration and pre-use checks.
Alarm Settings and Event Review
The audible alarm is rated at 85 dB, with light and vibration providing additional indications. Alarm set points can be configured for the monitoring procedure. The detector stores 100 alarm records that can be reviewed on the instrument. The 128 x 64 monochrome LCD supports English and Chinese interfaces; backlight timing can be adjusted, and the backlight turns on automatically during an alarm.
Instrument Specifications
| Model | MH-1200H-S4 |
|---|---|
| Gas configuration | CO, H2S, O2 and combustible gas |
| Sampling | Diffusion |
| Display | 128 x 64 monochrome LCD |
| Interface languages | English and Chinese |
| Alarm modes | Sound, light and vibration |
| Audible alarm | 85 dB |
| Alarm settings | Configurable set points |
| Alarm history | 100 records viewable on the instrument |
| Backlight | Adjustable timing; automatic illumination during an alarm |
| Battery | 2300 mAh rechargeable lithium-polymer |
| Operating temperature | -20 to 50 Degree C |
| Ingress protection | IP65 |
| Dimensions | 131 x 83 x 35 mm |
| Approximate instrument weight | 240 g including protective cover |
Controls and Carrying Details
Zero calibration, self-calibration, battery status checks and a factory reset function are available through the instrument controls. A rechargeable 2300 mAh lithium-polymer battery powers the monitor. The housing measures 131 x 83 x 35 mm, and the instrument weighs approximately 240 g including its protective cover. A rear clip provides a carrying point during inspection rounds.
Follow the instrument instructions and your monitoring procedure for setup, calibration, checks and alarm handling. Product photos illustrate the housing shared across this series; gas names on the demonstration screen may differ from the selected configuration.
Free Shipping
Free shipping is available on all orders. Shipping methods and carriers may vary depending on the destination, order details, and available logistics options. Full Shipping Policy
Returns Policy
For returns and refunds, please review our full Refund Policy before placing an order. If you need help with an order, contact us before your order has shipped whenever possible. Full Returns Policy
When Will My Order Ship?
For Standard Shipping, we aim to pack and ship out your order within 4 business days. During special periods, such as heavy order processing or local inventory shortages that require deployment, please expect it to take an additional day or two for processing. We ship five days a week, Monday through Friday.
You will receive a shipment confirmation with tracking information via email when your order has shipped. Once you receive this email, we cannot change or cancel your order.
Can I Change The Shipping Address On My Order?
Please contact us immediately via email if you realize that you gave us the wrong shipping address — if it hasn't shipped yet, we might be able to correct it before it goes out the door.If your order ships to the address provided and is returned to us as undeliverable, then you are responsible for paying the cost of shipping again to resend it to you. If you decide you do not want your order reshipped, we'll refund you for the products less the original shipping charges, once your order returns to our warehouse. We'll reach out to you to coordinate your options before re-shipping.
If your order ships to an incorrect address provided at the time the order is placed and is not retrievable, we are not responsible and cannot offer reimbursement.
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Let customers speak for us
My first impression after opening and installing batteries was that this meter is very well built considering the price and manufacturer. I had read some reviews stating that it's amp measurements were not accurate below 5 amps, I haven't seen any issues in any measurements I've taken, even side by side with my fluke meters. I've successfully taken accurate amp, voltage and continuity measurements with this ETCR6920B, the display is nice and legible. I haven't tried storing data and making transfers to a PC yet, the soft case is good enough for storage on a shelf and the test leads are of good quality and rated for 1000v. There's nothing bad to say about this meter especially when you consider the price, it's a really great meter.
Works as described.
