DIGITIZERS

1. Resolution: “Minimum 24 bits per channel, selectable up to 31 bits”
Question:
Given that digitizers used in international seismic networks operate with true 24-bit ADCs and that bit selectability is neither standard nor technically meaningful, could you confirm that devices with fixed 24-bit resolution and validated performance ≥142 dB will be accepted?

Proposal:
Accept fixed 24-bit resolution per channel with proven performance as sufficient.
NON ACCETTABILE

2. Sampling frequency: “Configurable up to 5000 Hz”
Question:
Considering that 5000 Hz is not a standard sampling frequency for broadband seismic monitoring, could you confirm that devices with configurable sampling up to at least 1000 Hz will be accepted if all other specifications are met?

Proposal:
Accept configurable sampling up to 1000 Hz as valid.
NON ACCETTABILE

3. Ethernet and WiFi interface
Question:
Taking into account that Ethernet is the standard interface in seismic stations and that WiFi is often avoided due to security and interference concerns, could you confirm that devices with mandatory Ethernet and optional WiFi (integrated or via certified external accessory) will be accepted?

Proposal:
Accept Ethernet as the base interface and allow WiFi as an optional feature.
ACCETTABILE

4. Maximum dimensions: “≤ 20 x 20 x 20 cm”
Question:
Could you confirm that digitizers slightly exceeding one dimension (e.g., by 1–2 cm) will be accepted, provided all technical and installation requirements are fully met?

Proposal:
Allow minor exceedance in one dimension if the device meets all other requirements.
NON ACCETTABILE

POSTHOLE BROADBAND SEISMOMETERS

1. Power consumption: “≤ 230 mW”
Question:
Could you confirm that sensors with power consumption up to 600 mW will be accepted, provided all other technical and environmental specifications are met?

Proposal:
Accept power consumption up to 600 mW if technically justified by sensor design.
NON ACCETTABILE

2. Maximum diameter: “≤ 14.5 cm”
Question:
Could you confirm that sensors with a diameter up to 165 mm will be accepted, provided compatibility with posthole installation, IP68 protection, and impact resistance is ensured?

Proposal:
Accept sensors with diameter ≤ 165 mm when all other conditions are fulfilled.
NON ACCETTABILE

SURFACE BROADBAND SEISMOMETERS

Power consumption: “≤ 230 mW”
Question:
Given that the proposed sensor consumes 275 mW due to its advanced design, could you confirm that a 45 mW increase in power consumption will be accepted?

Proposal:
Accept power consumption up to 275 mW if all other technical requirements are fully met.
NON ACCETTABILE

ACCELEROMETERS

1. Frequency band: “DC – 430 Hz”
Question:
Could you confirm that accelerometers with a frequency band up to 400 Hz (±3 dB) will be accepted, provided they meet all other technical specifications and international seismic monitoring standards?
NON ACCETTABILE

2. Maximum weight: “≤ 2 kg”
Question:
Could you confirm that sensors weighing up to 2.4 kg (400 grams above the limit) will be accepted, provided they comply with dimensional, mounting, and impact resistance requirements?
NON ACCETTABILE

3. Power consumption: “≤ 1.4 W” (currently)
Question:
Would it be possible to adjust the maximum allowed power consumption for accelerometers to ≤ 600 mW, or alternatively, to standardize the power consumption limit for all passive seismic instrumentation (posthole and surface seismometers) to a unified maximum of 1.4 W?

Proposal:
Unify the power consumption limit for all analog seismic instruments to a maximum of 1.4 W or reduce the limit for accelerometers to 600 mW to ensure technical and operational consistency.
NON ACCETTABILE

TRIAXIAL GALPERIN CONFIGURATION

Observation:
We would like to raise the following points for your consideration:

1. No measurable advantage has been demonstrated for Galperin over classical orthogonal (XYZ) sensor geometry in terms of data quality, sensitivity, or dynamic range. On the contrary, Galperin introduces additional signal processing complexity and is unable to detect long-period tilt signals due to the absence of direct mass position output.
2. In Galperin configuration, failure of one component leads to apparently valid but corrupted data, which may remain undetected for long periods. In contrast, XYZ sensors allow immediate identification of such faults.
3. Galperin seismometers cannot be validated using standard 2D shake tables, which are the industry standard for sensor testing and verification.
4. There is no international norm or scientific consensus (FDSN, IRIS, IUGG, IASPEI, etc.) that mandates Galperin configuration as a technical requirement for modern broadband seismometers.

Question:
Could you confirm that triaxial sensors with XYZ configuration and validated performance in active seismic networks will be accepted?
NON ACCETTABILE

GENERAL REQUIREMENTS

1. Datasheets published for at least 12 months
Observation:
This requirement may exclude new-generation products that are already fully documented, certified, and in active operation.

Proposal:
Accept manufacturer-signed datasheets accompanied by evidence of use in active seismic networks for at least 6 months.

Is it possible to partecipate with these conditions?
NON ACCETTABILE

La presente gara è concepita con dei criteri di ammissione minimi, migliorabili a seconda delle offerte con caratteristiche tecniche superiori a quelle richieste. Non è quindi né accettabile né applicabile poter prendere in considerazione sistemi con caratteristiche diverse ed in taluni casi peggiorative, rispetto al capitolato in essere.