Looking for Fixed H2S Gas Detector for Battery Room

My organization and I are looking to install several fixed Hydrogen Sulfide detectors in a battery room where we have experienced outgassing events with lead sulfuric acid batteries.  One of our main issues are that due to the space pressurization, there is a large amount of air movement that has caused the gas to be picked up and spread throughout the facility. Would ATO gas detectors be suitable to pick up concentrations in spaces that see large amounts of air changes are various heights? What is the amp draw of these detectors off a 24 VDC circuit? What is the relay out capacity as well? We are considering using a 24 VDC to 48 VDC relay to drive a SCADA alarm.

Richard wrote:
1. The due to the space pressurization you mentioned mean that the pressure is constantly increasing? Is the atmospheric pressure in the facility greater than normal?
2. What are the various heights you mentioned?
3. What is the specific concentration of the pickup concentrations in spaces that see large amounts of air changes you mentioned? What range of H2S detectors do you need?
4. We can provide a 24V 1A power adapter. The output capacity of the relay is 24Vdc 100mA.

ATO wrote:
No, the space pressure is slightly negative due to fans that draw air into a common plenum from outside. It just so happens to also draw on space where these batteries are located due to the design of the adjacent spaces. And this is intended as well. One set of batteries is located approximately 3" from the ground and is 12-14" to the top where the H2S gas would typically emit during a battery outgassing. The other batteries are at a height of 18” and 42” respectively. When we had our outgassing event, we detected approximately 20 ppm H2S. We would need a 0-100ppm detector I would imagine, possibly the 0-200ppm even.

Richard wrote:
Ok, we think the space pressure is slightly negative and should have little effect. You can buy a 0-100ppm detector first, or a 0-200ppm version to check how it works. See specs and price on: https://www.ato.com/fixed-hydrogen-sulfide-h2s-gas-detector

ATO wrote:
We've used ATO detectors in our battery rooms with slightly negative pressure without any issues. The key is proper placement and ensuring they are maintained regularly. Also, make sure the detectors have a good calibration schedule to maintain accuracy, especially in an environment with varying airflows.