Description
EXPO ETM-IS31-001 Intrinsically Safe Battery Pack
Product Introduction
This is not a generic 12 V industrial battery.
The EXPO Technologies ETM-IS31-001 is a dedicated intrinsically safe battery pack, Revision 2, engineered for use with EXPO electronic timer equipment in hazardous-area applications. Its job is straightforward but safety-critical: provide the required battery power to the electronic timer when the system configuration calls for the intrinsically safe battery option. EXPO’s MiniPurge documentation specifically lists the ETM-IS31-001 as the IS battery pack for the electronic timer module.
The certification history is also important. FM’s examination record for the Electronic Timer Module shows that the ETM-IS31-001 battery pack was added as a certified component in Supplement 2, with the certification tied to FM10ATEX0003X.
That makes the complete part number important. A physically similar rechargeable battery or another 12 V pack is not automatically an acceptable substitute for ETM-IS31-001.
ETM-IS31-001
Key Technical Specifications
- Manufacturer: EXPO Technologies
- Exact Part Number: ETM-IS31-001
- Product Name: IS Battery Pack REV 2
- Product Type: Intrinsically safe battery module
- Application: Electronic Timer Module
- System Family: EXPO MiniPurge
- Nominal Voltage: 12 VDC
- Nominal Capacity: 3.0 Ah
- Cut-Off Voltage: 9.0 V
- Self-Discharge: <1% per year at 20°C according to secondary technical data
- Housing Material: Aluminum
- Hazardous-Area Marking: Ex ia IIC T6 Ga
- Dust Protection Marking: Ex iaD 20 T85°C
- Ambient Temperature: −20°C to +60°C
- Certification: FM10ATEX0003X
- IECEx Certification: IECEx FME10.0001X
- Revision: REV 2
- System Role: Electronic timer backup/IS power source
- Associated Equipment: EXPO MiniPurge systems including ML433 applications
- Reported Weight: Approximately 0.24 kg
- Country of Origin: Reported as USA by secondary product documentation
The 12 VDC, 3.0 Ah, 9.0 V cut-off, aluminum enclosure, and −20°C to +60°C figures are reported together for this exact part number by current technical listings.
Hazardous-Area Certification & Application
The most important specification on is not its capacity — it is its intrinsic-safety certification.
The battery pack is documented as:
- Ex ia IIC T6 Ga
- Ex iaD 20 T85°C
- Tamb: −20°C to +60°C
- FM10ATEX0003X
- IECEx FME10.0001X
The certification applies to the battery’s intended integration with the certified electronic timer system. The FM certification record identifies the as an added battery-pack configuration within the approved Electronic Timer Module family.
This distinction matters during maintenance. The battery should be treated as a certified system component, not as an independently interchangeable 12 V battery.
EXPO’s MiniPurge documentation also lists as a recommended spare for the electronic timer module.
Application Scenarios & Pain Points
MiniPurge Electronic Timer Systems
The primary application is EXPO MiniPurge equipment where an electronic timer requires an intrinsically safe battery source.
Hazardous-Area Purge Systems
The battery module is used within equipment designed for hazardous environments where the electrical energy available to ignition-capable circuits must be controlled.
Maintenance Replacement
When the installed timer battery reaches the end of its service life, the provides the specified replacement rather than requiring the engineer to redesign the battery interface.
Emergency / Backup Timer Operation
EXPO documentation identifies the battery as an IS battery pack for the electronic timer. This makes it particularly relevant where the timer must retain its required operating function when the normal power arrangement is unavailable or when an IS battery option is specified.
Legacy MiniPurge Equipment
For older EXPO installations, sourcing the exact can be considerably safer than adapting a modern battery pack without certification evidence.
QA & Live Testing SOP
With an intrinsically safe battery, conventional battery testing has limits. Do not treat this as a normal high-current industrial battery pack.
- Part-number verification: Confirm
and REV 2. - Physical inspection: Check the aluminum enclosure for dents, cracks, corrosion, deformation, or unauthorized modification.
- Terminal inspection: Examine connectors and terminals for oxidation, looseness, or contamination.
- Label verification: Confirm the hazardous-area markings and certification identifiers remain legible.
- Voltage check: Measure open-circuit voltage using a test procedure appropriate for the certified assembly.
- Capacity assessment: If required, perform capacity evaluation only using a manufacturer-approved procedure.
- Temperature check: Confirm storage and operating conditions remain within the documented −20°C to +60°C range.
- Leakage/insulation inspection: Check for abnormal leakage or physical evidence of battery degradation.
- System verification: Confirm compatibility with the specific EXPO electronic timer before installation.
- Certification control: Do not modify the enclosure, internal wiring, terminals, or protection components.
- Packaging: Protect the battery from impact, short circuit, moisture, and unauthorized handling during transport.
For an Ex-rated battery, “same voltage” is not an adequate substitution criterion. Voltage, capacity, energy limitation, construction, enclosure, and certification all form part of the safety case.
Field Engineer’s Pitfall Guide
❗ Do not substitute a generic 12 V / 3 Ah battery. The is an intrinsically safe component associated with a certified Electronic Timer Module. The certification cannot be inferred from voltage and capacity alone.
❗ Do not confuse with the complete Electronic Timer Module. The part is specifically the battery pack, while the timer itself is a separate assembly. EXPO documentation lists both the battery pack and electronic timer assembly as separate spare parts.
❗ Do not modify the battery enclosure. Drilling, opening, replacing internal components, or changing wiring can compromise the certified construction.
❗ Check the certification revision. The FM record specifically documents the addition of the battery pack to the approved system. That certification history is more meaningful than an aftermarket seller’s generic “explosion-proof” description.
❗ Watch the temperature class. The documented marking is T6, with an ambient range of −20°C to +60°C. A battery with a different temperature classification should not be assumed equivalent.
Intent-Driven FAQ
What is EXPO ?
The is an intrinsically safe battery pack, Revision 2, for an Electronic Timer Module used in EXPO MiniPurge equipment.
What voltage is ?
The documented nominal voltage is 12 VDC, with a nominal capacity of 3.0 Ah and a reported cut-off voltage of 9.0 V.
Is explosion-proof?
It is documented as an intrinsically safe battery pack with Ex ia IIC T6 Ga / Ex iaD 20 T85°C markings and certification references including FM10ATEX0003X and IECEx FME10.0001X.
What equipment uses ?
It is used with EXPO Electronic Timer Modules and is specifically listed as an IS battery pack in EXPO MiniPurge documentation. The ML433 system is one documented application.
What is the operating temperature range?
The documented ambient range for the battery pack is −20°C to +60°C.
Can I replace with another 12 V battery?
No—not without documented approval. The is a certified intrinsically safe battery component. Electrical voltage and capacity alone do not establish hazardous-area compatibility.
Is a complete electronic timer?
No. It is the battery pack for the electronic timer module. EXPO documentation identifies the electronic timer assembly as a separate component.
What should I verify before purchasing?
Verify , REV 2, the hazardous-area markings, certification references, physical condition, battery age/date information where available, and compatibility with the exact EXPO Electronic Timer/MiniPurge configuration.
Procurement Note
EXPO Technologies is a specialized intrinsically safe battery pack, not a generic industrial battery. Its documented role is to provide IS battery power for the Electronic Timer Module, with certification tied into the approved EXPO system.
For procurement, the critical checks are exact part number, REV 2 identification, certification markings, battery condition, and the host MiniPurge/timer model. Do not approve a substitute simply because its nominal voltage and Ah rating appear similar.
