diff --git a/ontology/saref4ehaw.ttl b/ontology/saref4ehaw.ttl
index a375e515876b2b86922a828d87bbb6fb76166e77..2e9d838300c3bcae321fb3fcd84a2b68983bbb2c 100644
--- a/ontology/saref4ehaw.ttl
+++ b/ontology/saref4ehaw.ttl
@@ -445,16 +445,16 @@ s4ehaw:availableRam rdf:type owl:DatatypeProperty ;
 ###  https://saref.etsi.org/saref4ehaw/transmissionRate
 s4ehaw:transmissionRate rdf:type owl:DatatypeProperty ;
             rdfs:domain s4ehaw:Interface ;
-            rdfs:range xsd:long ;
-            rdfs:comment "The interface transmission rate of the interface, the number of bits transmitted by second."@en ;
+            rdfs:range xsd:float ;
+            rdfs:comment "The transmission rate of the interface, i.e. the number of bits transmitted per second (usually expressed in kbps or Mbps)."@en ;
             rdfs:label "transmission rate"@en .
 
 
 ###  https://saref.etsi.org/saref4ehaw/dataSize
 s4ehaw:dataSize rdf:type owl:DatatypeProperty ;
                 rdfs:domain s4ehaw:Data ;
-                rdfs:range xsd:integer ;
-                rdfs:comment "The data size represents the size of the data in bits"@en ;
+                rdfs:range xsd:positiveInteger ;
+                rdfs:comment "The data size represents the size of the data in bytes"@en ;
                 rdfs:label "data size"@en .
 
 
@@ -525,8 +525,8 @@ s4ehaw:format rdf:type owl:DatatypeProperty ;
 ###  https://saref.etsi.org/saref4ehaw/frequency
 s4ehaw:frequency rdf:type owl:DatatypeProperty ;
                  rdfs:domain s4ehaw:ComputingPower ;
-                 rdfs:range xsd:long ;
-                 rdfs:comment "The frequency is the number of instructions an embedded processor - within a health device - can perform per second."@en ;
+                 rdfs:range xsd:float ;
+                 rdfs:comment "The frequency is the number of instructions an embedded processor - within a health device - can perform per second (MIPS)."@en ;
                  rdfs:label "frequency"@en .
 
 
@@ -709,7 +709,7 @@ s4ehaw:maximumRam rdf:type owl:DatatypeProperty ;
 ###  https://saref.etsi.org/saref4ehaw/maximumValue
 s4ehaw:maximumValue rdf:type owl:DatatypeProperty ;
                     rdfs:domain s4ehaw:ValidityConstraint ;
-                    rdfs:range xsd:double ;
+                    rdfs:range xsd:decimal ;
                     rdfs:comment "The maximum allowable value of a measurement."@en ;
                     rdfs:label "maximum value"@en .
 
@@ -717,7 +717,7 @@ s4ehaw:maximumValue rdf:type owl:DatatypeProperty ;
 ###  https://saref.etsi.org/saref4ehaw/minimumValue
 s4ehaw:minimumValue rdf:type owl:DatatypeProperty ;
                     rdfs:domain s4ehaw:ValidityConstraint ;
-                    rdfs:range xsd:double ;
+                    rdfs:range xsd:decimal ;
                     rdfs:comment "The minimum allowable value  of a measurement."@en ;
                     rdfs:label "minimum value"@en .