How do instrumentation manufacturers answer tender specifications?
An instrument enquiry usually comes as a set of instrument datasheets, one per tag, with a project instrumentation specification, the owner's standards and the industry standards they call up. Control-valve packages add process data and sizing cases. The manufacturer checks each datasheet field and clause against the offered model and options, then returns a compliance statement and a technical deviation list.
Who answers RFQs at an instrumentation maker?
Bid engineers and proposal engineers usually own the technical offer, with application engineers selecting models and sizing control valves. At smaller instrument makers a project manager often answers the RFQ, drawing on engineering for selection and on quality staff for certificates.
What goes in an instrument deviation list?
The example below uses an invented specification, PS-INS-001, for pressure transmitters and a control valve. Every value is illustrative.
| Spec clause | Requirement | Offered | Status | Deviation / clarification | Justification | Cost of withdrawal |
|---|---|---|---|---|---|---|
| PS-INS-001 §4.3 | Transmitter certified Ex d, gas group IIC | Ex d, gas group IIB + H2 | Deviation | IIB + H2 instead of IIC | Covers hydrogen; buyer to confirm against the area classification | IIC housing: +4%, +2 weeks |
| PS-INS-001 §5.1 | Communication HART 7 | HART 7 | Complies | None | Datasheet field 22 | Not applicable |
| PS-INS-001 §6.2 | Wetted parts to NACE MR0175 / ISO 15156 | 316L diaphragm, NACE statement | Clarification | Statement, not a material certificate | Material certificate available on order | Certificate: no cost |
| PS-INS-001 §8.4 | Control valve sized to IEC 60534-2-1 | Sizing to ANSI/ISA-75.01.01 | Clarification | ISA equation set used | ISA and IEC sizing equations are harmonised | Re-issue on IEC basis: no cost |
Start from the free deviation list template, and use the datasheet vs specification checklist, which covers instrument checks.
Which standards come up in instrumentation tenders?
| Standard | What it covers | Typical deviation source |
|---|---|---|
| IEC 60534 | Industrial-process control valves; part 1 gives terminology and general considerations for the series (IEC) | Which part and edition the tender calls up |
| ANSI/ISA-75.01.01 | Control valve sizing equations for fluid flow, harmonised with IEC 60534-2-1 (ANSI webstore) | Sizing basis and equation set |
| IEC 60079 / ATEX / IECEx | Equipment for explosive atmospheres and how it is certified (Gore) | Protection concept, gas group, temperature class, scheme |
| IEC 61508 / IEC 61511 | Functional safety, and its application to safety instrumented systems in the process industry (exida) | SIL capability evidence for instruments in safety functions |
| NACE MR0175 / ISO 15156 | Materials for H2S-containing environments in oil and gas production (Project Materials) | Wetted-material evidence |
| Communication protocol | HART or a fieldbus as named in the datasheet | Protocol version and device description files |
How does OdysseyGPT help?
OdysseyGPT reads the whole specification package for a instrumentation tender: project and technical specifications, the material requisition, the inspection and test plan, datasheets and the standards they call up. It checks each customer requirement against your own datasheets, standard specifications and test procedures, and gives every requirement a status (complies, deviates, clarification, not addressed, document requested, not applicable or out of scope) with a quote from the source document and page.
It exports an editable compliance matrix and a deviations & clarifications list. It reads PDF, Word, Excel and CSV files. It does not interpret engineering drawings such as general arrangements or P&IDs, and it does not send anything to the customer: your engineers decide every open item, the justification and the cost of withdrawal, and own what goes out. See OdysseyGPT for manufacturing.
OdysseyGPT Managed: from $999/month
A managed subscription with onboarding included. See pricing or request a demo built around one of your own past tenders.